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C# STRING LIST EXAMPLE Consider this example program. We create a string List and add 3 values to it—these are stored in the order added. Enum. For We use a for-loop over the string List. See carefully how the index is used to access each item in the values List. For. Foreach The foreach C# STATIC DICTIONARY C# Static Dictionary - Dot Net Perls. C# Static Dictionary Develop a static Dictionary that tests strings. Compute plural words from singular words. dot net perls. Static Dictionary. A static Dictionary can store global data. It lets you quickly look up strings (or other values). It is shared among many instances. VB.NET FOR LOOP EXAMPLES (FOR EACH) VB.NET program that uses For-loop, Exit For. Module Module1 Sub Main () ' Step 1: specify a loop goes from 0 to 5. For value As Integer = 0 To 5 ' Step 2: print the current index of the loop. Console.WriteLine ( "CURRENT FOR-INDEX: {0}", value) ' Step 3: exit condition if thevalue is 3.
VB.NET 2D, 3D AND JAGGED ARRAY EXAMPLES VB.NET 2D, 3D and Jagged Array Examples Use 2D arrays along with 3D and jagged arrays. Review the syntax for these arrays. dot net perls. 2D arrays. Sometimes data is part of a two-dimensional space. We can use VB.NET to represent this space—a 2D array can be allocated andused. Other arrays.
VB.NET SORT EXAMPLES: ARRAYS AND LISTS VB.NET program that uses lambda, sorts List. Module Module1 Sub Main () Dim numbers = New List (Of Integer) ( {20, 30, 40}) ' Use lambda to sort list in descending order. numbers. Sort ( Function (valueA, valueB) valueB.CompareTo (valueA)) For Each number As Integer In numbers Console.WriteLine ( "LAMBDA SORTED NUMBER: {0}", number) NextEnd
VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET STRING.FORMAT EXAMPLES: STRING AND INTEGER Module Module1 Sub Main() ' Format String.Dim format As String = "{0,-10} {1,10}" ' Construct lines.Dim line1 As String = String.Format(format, 100, 5) Dim line2 As String = String.Format(format, "Carrot", "Giraffe") Dim line3 As String = String.Format(format, True, False) ' Print them.Console.WriteLine(line1) Console.WriteLine(line2) Console.WriteLine(line3) End Sub End Module VB.NET SUBSTRING EXAMPLES Substring () returns a new String instance containing the range of characters. It throws Exceptions on invalid arguments. First example. Here we use Substring to get several characters of an input string. We start at index 1, and continue for 2 chars—the result string has 2 chars. Tip A new String is returned. VB.NET ASYNC, AWAIT EXAMPLE VB.NET Async, Await Example Use the Async and Await keywords to run code asynchronously. Review Task, Start and Wait. dot net perls. Async, Await. In asynchronous programming, many control flows can exist at once. With the Async and Await keywords in VB.NET we have a standard, clear way to program this way. Threading is supported. VB.NET LIST EXAMPLES VB.NET program that uses For-Each and For, List. Module Module1 Sub Main () ' Part 1: create List and add 3 Integers. Dim list As New List (Of Integer) list. Add (2) list.Add (3) list.Add (7) ' Part 2: loop through List elements. For Each number As Integer In list Console.WriteLine ( "FOR EACH: {0}", number) Next ' Part 3: loopthrough list
C# STRING LIST EXAMPLE Consider this example program. We create a string List and add 3 values to it—these are stored in the order added. Enum. For We use a for-loop over the string List. See carefully how the index is used to access each item in the values List. For. Foreach The foreach C# STATIC DICTIONARY C# Static Dictionary - Dot Net Perls. C# Static Dictionary Develop a static Dictionary that tests strings. Compute plural words from singular words. dot net perls. Static Dictionary. A static Dictionary can store global data. It lets you quickly look up strings (or other values). It is shared among many instances. VB.NET FOR LOOP EXAMPLES (FOR EACH) VB.NET program that uses For-loop, Exit For. Module Module1 Sub Main () ' Step 1: specify a loop goes from 0 to 5. For value As Integer = 0 To 5 ' Step 2: print the current index of the loop. Console.WriteLine ( "CURRENT FOR-INDEX: {0}", value) ' Step 3: exit condition if thevalue is 3.
VB.NET 2D, 3D AND JAGGED ARRAY EXAMPLES VB.NET 2D, 3D and Jagged Array Examples Use 2D arrays along with 3D and jagged arrays. Review the syntax for these arrays. dot net perls. 2D arrays. Sometimes data is part of a two-dimensional space. We can use VB.NET to represent this space—a 2D array can be allocated andused. Other arrays.
VB.NET SORT EXAMPLES: ARRAYS AND LISTS VB.NET program that uses lambda, sorts List. Module Module1 Sub Main () Dim numbers = New List (Of Integer) ( {20, 30, 40}) ' Use lambda to sort list in descending order. numbers. Sort ( Function (valueA, valueB) valueB.CompareTo (valueA)) For Each number As Integer In numbers Console.WriteLine ( "LAMBDA SORTED NUMBER: {0}", number) NextEnd
VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET STRING.FORMAT EXAMPLES: STRING AND INTEGER Module Module1 Sub Main() ' Format String.Dim format As String = "{0,-10} {1,10}" ' Construct lines.Dim line1 As String = String.Format(format, 100, 5) Dim line2 As String = String.Format(format, "Carrot", "Giraffe") Dim line3 As String = String.Format(format, True, False) ' Print them.Console.WriteLine(line1) Console.WriteLine(line2) Console.WriteLine(line3) End Sub End Module VB.NET SUBSTRING EXAMPLES Substring () returns a new String instance containing the range of characters. It throws Exceptions on invalid arguments. First example. Here we use Substring to get several characters of an input string. We start at index 1, and continue for 2 chars—the result string has 2 chars. Tip A new String is returned. VB.NET ASYNC, AWAIT EXAMPLE VB.NET Async, Await Example Use the Async and Await keywords to run code asynchronously. Review Task, Start and Wait. dot net perls. Async, Await. In asynchronous programming, many control flows can exist at once. With the Async and Await keywords in VB.NET we have a standard, clear way to program this way. Threading is supported. VB.NET 2D, 3D AND JAGGED ARRAY EXAMPLES VB.NET 2D, 3D and Jagged Array Examples Use 2D arrays along with 3D and jagged arrays. Review the syntax for these arrays. dot net perls. 2D arrays. Sometimes data is part of a two-dimensional space. We can use VB.NET to represent this space—a 2D array can be allocated andused. Other arrays.
C# ASPARALLEL EXAMPLE Example. We introduce 2 methods. SumDefault sums all the elements in the array with the Sum method alone. SumAsParallel first calls AsParallel on the array. It then calls Sum on the result of AsParallel. The two methods have the same result. Sum. Result We can VB.NET FUNC, ACTION AND PREDICATE EXAMPLES Module Module1 Sub Main() ' This Predicate receives an Integer, and returns a Boolean. It tells us if an Integer is positive. Dim isPositive As Predicate(Of Integer) = Function (x) x >= 0 If isPositive. Invoke(10) Then Console.WriteLine("NUMBER IS POSITIVE") End If ' This Predicate receives a String. It returns true if the string is short (less than 10 chars). VB.NET STRING.FORMAT EXAMPLES: STRING AND INTEGER Module Module1 Sub Main() ' Format String.Dim format As String = "{0,-10} {1,10}" ' Construct lines.Dim line1 As String = String.Format(format, 100, 5) Dim line2 As String = String.Format(format, "Carrot", "Giraffe") Dim line3 As String = String.Format(format, True, False) ' Print them.Console.WriteLine(line1) Console.WriteLine(line2) Console.WriteLine(line3) End Sub End Module VB.NET PROPERTY EXAMPLES (GET, SET) First example. On the Number property, we provide Get and Set blocks. In Get we return a value—the backing store count. In Set we receive a parameter and then store it in the count field. Step 1 When the value 1 is assigned to the Number property, Set is executed. The count field stores the value 1. VB.NET MOD OPERATOR (ODD, EVEN NUMBERS) VB.NET program that tests odd, even numbers. Module Module1 Function IsOdd (ByVal number As Integer) As Boolean ' Handle negative numbers by returning the opposite of IsEven. Return IsEven (number) = False End Function Function IsEven (ByVal number As Integer) As Boolean ' Handles all numbers because it tests for 0 remainder. VB.NET DICTIONARY EXAMPLES Usually we create an empty Dictionary and then populate it with keys and values. Step 1 We create Dictionary with String keys, and Integer values. The Dictionary is empty here. Step 2 We invoke Add to populate the Dictionary. For the arguments, we pass the key we want to add, andthe value.
VB.NET DATATABLE SELECT FUNCTION First example. We create a DataTable with the name "Players." We add 2 columns—each row will store a "Size" and "Team" value. We call Rows.Add 5 times to populate the collection with data. Then We call the DataTable Select Function. This returns an array of DataRow instances. DataRow. Query We use the query (Size >= 230 AND Team ="b").
VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do." VB.NET MATH.ABS: ABSOLUTE VALUE This program uses Integer and Double types with the Math.Abs function. Only the negative inputs have a different absolute value. The value -1000 has an absolute value of 1000. And -100.123 has an absolute value of 100.123. Tip The value returned from Math.Abs is of the same type as the value you pass to it. C# STRING LIST EXAMPLE Consider this example program. We create a string List and add 3 values to it—these are stored in the order added. Enum. For We use a for-loop over the string List. See carefully how the index is used to access each item in the values List. For. Foreach The foreachC# ASCII TABLE
C# ASCII Table Generate an ASCII table with a for-loop. Display all characters in ASCII. dot net perls. ASCII table. This is a quick reference for ASCII character codes. We use a simple C# program to generate this dynamically. We see the ASCII character codes for the first 128 characters. Code sample. Please notice the C# consoleprogram that
VB.NET THREADPOOL
dot net perls. ThreadPool handles many threads. It allows us to easily manage these threads. We optimize when they run for the best performance. We account for multiple cores and processors. ThreadPool eliminates our need to implement this logic. Example. First, this example uses the QueueUserWorkItem sub on the ThreadPool type. C# COMPOUND INTEREST The bank pays an interest rate of 4.3%, compounded quarterly. It is left in the account for six years. Quarterly When interest is compounded quarterly, we pass 4 to the method. When interest is compounded monthly, we pass 12. Result We find that the $1,500 amounthas
C# URI AND URIBUILDER CLASSES Class info. In C# programs, you can manage URI data directly with strings. But IndexOf and Substring often involve bugs and errors. The Uri class simplifies this problem. C# CONVERT MILLISECONDS, SECONDS, MINUTES Convert milliseconds. Milliseconds, seconds, minutes, hours and days can be converted. These values may be from another data source such as a database or file from a different system. VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET STRING.EQUALS FUNCTION With the VB.NET String.Equals Function in its various syntax forms, including the equals operator, you can do this. We look at examples of string equality testing. This program first creates 2 String variables. These are created at runtime and both have the value "a1". Next, we show the instance Equals method, the Shared Equals method,the
VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do." VB.NET MATH.ABS: ABSOLUTE VALUE This program uses Integer and Double types with the Math.Abs function. Only the negative inputs have a different absolute value. The value -1000 has an absolute value of 1000. And -100.123 has an absolute value of 100.123. Tip The value returned from Math.Abs is of the same type as the value you pass to it. C# STRING LIST EXAMPLE Consider this example program. We create a string List and add 3 values to it—these are stored in the order added. Enum. For We use a for-loop over the string List. See carefully how the index is used to access each item in the values List. For. Foreach The foreachC# ASCII TABLE
C# ASCII Table Generate an ASCII table with a for-loop. Display all characters in ASCII. dot net perls. ASCII table. This is a quick reference for ASCII character codes. We use a simple C# program to generate this dynamically. We see the ASCII character codes for the first 128 characters. Code sample. Please notice the C# consoleprogram that
VB.NET THREADPOOL
dot net perls. ThreadPool handles many threads. It allows us to easily manage these threads. We optimize when they run for the best performance. We account for multiple cores and processors. ThreadPool eliminates our need to implement this logic. Example. First, this example uses the QueueUserWorkItem sub on the ThreadPool type. C# COMPOUND INTEREST The bank pays an interest rate of 4.3%, compounded quarterly. It is left in the account for six years. Quarterly When interest is compounded quarterly, we pass 4 to the method. When interest is compounded monthly, we pass 12. Result We find that the $1,500 amounthas
C# URI AND URIBUILDER CLASSES Class info. In C# programs, you can manage URI data directly with strings. But IndexOf and Substring often involve bugs and errors. The Uri class simplifies this problem. C# CONVERT MILLISECONDS, SECONDS, MINUTES Convert milliseconds. Milliseconds, seconds, minutes, hours and days can be converted. These values may be from another data source such as a database or file from a different system. VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET STRING.EQUALS FUNCTION With the VB.NET String.Equals Function in its various syntax forms, including the equals operator, you can do this. We look at examples of string equality testing. This program first creates 2 String variables. These are created at runtime and both have the value "a1". Next, we show the instance Equals method, the Shared Equals method,the
VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do." VB.NET MATH.ABS: ABSOLUTE VALUE This program uses Integer and Double types with the Math.Abs function. Only the negative inputs have a different absolute value. The value -1000 has an absolute value of 1000. And -100.123 has an absolute value of 100.123. Tip The value returned from Math.Abs is of the same type as the value you pass to it. RUST FIND STRING EXAMPLES Rust Find String Examples Search for patterns in strings with the find and rfind functions. Use is_ascii_digit to match character groups. dot net perls. Find strings. Often we wish to locate the index of a substring inside another string. In Rust, we have no "index of" function but we have find (). C# URI AND URIBUILDER CLASSES Class info. In C# programs, you can manage URI data directly with strings. But IndexOf and Substring often involve bugs and errors. The Uri class simplifies this problem. VB.NET FUNC, ACTION AND PREDICATE EXAMPLES Module Module1 Sub Main() ' This Predicate receives an Integer, and returns a Boolean. It tells us if an Integer is positive. Dim isPositive As Predicate(Of Integer) = Function (x) x >= 0 If isPositive. Invoke(10) Then Console.WriteLine("NUMBER IS POSITIVE") End If ' This Predicate receives a String. It returns true if the string is short (less than 10 chars). C# CONVERT MILLISECONDS, SECONDS, MINUTES Convert milliseconds. Milliseconds, seconds, minutes, hours and days can be converted. These values may be from another data source such as a database or file from a different system. RUBY SUBSTRING EXAMPLES First argument is start index, second is length. last_three = value puts last_three # Get substring at index 1 with length 2. middle_two = value puts middle_two ove ov. Regular expressions. We can get substrings with a regular expression argument in place of ranges or indexes. The substring returned is the match ofthe regexp.
VB.NET SORT EXAMPLES: ARRAYS AND LISTS VB.NET program that uses lambda, sorts List. Module Module1 Sub Main () Dim numbers = New List (Of Integer) ( {20, 30, 40}) ' Use lambda to sort list in descending order. numbers. Sort ( Function (valueA, valueB) valueB.CompareTo (valueA)) For Each number As Integer In numbers Console.WriteLine ( "LAMBDA SORTED NUMBER: {0}", number) NextEnd
VB.NET TOLOWER AND TOUPPER EXAMPLES VB.NET ToLower and ToUpper Examples Use the ToLower and ToUpper Functions on strings to change the cases of letters. dot net perls. ToLower, ToUpper. ToLower changes Strings that contain uppercase letters. We convert all the uppercase letters in a String to lowercase letters. With ToLower this is easy to do. Function notes. VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do." VB.NET MOD OPERATOR (ODD, EVEN NUMBERS) VB.NET program that tests odd, even numbers. Module Module1 Function IsOdd (ByVal number As Integer) As Boolean ' Handle negative numbers by returning the opposite of IsEven. Return IsEven (number) = False End Function Function IsEven (ByVal number As Integer) As Boolean ' Handles all numbers because it tests for 0 remainder. VB.NET STRING.ISNULLOREMPTY, ISNULLORWHITESPACE Nothing The String reference itself equals Nothing. This is another term for null. 2. Empty The String data is empty. IsNullOrWhiteSpace returns True in this case. This is not shown in the program. 3. Whitespace only The String data contains only whitespace. Any whitespace, including newlines C# STRING LIST EXAMPLE Consider this example program. We create a string List and add 3 values to it—these are stored in the order added. Enum. For We use a for-loop over the string List. See carefully how the index is used to access each item in the values List. For. Foreach The foreach C# URI AND URIBUILDER CLASSES Class info. In C# programs, you can manage URI data directly with strings. But IndexOf and Substring often involve bugs and errors. The Uri class simplifies this problem. C# COMPOUND INTEREST The bank pays an interest rate of 4.3%, compounded quarterly. It is left in the account for six years. Quarterly When interest is compounded quarterly, we pass 4 to the method. When interest is compounded monthly, we pass 12. Result We find that the $1,500 amounthas
VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET IENUMERABLE EXAMPLES VB.NET IEnumerable Examples Use the IEnumerable Interface with arrays, Lists, and For-Each loops. dot net perls. IEnumerable. An IEnumerable collection contains elements. We use the For-Each loop in VB.NET to loop over these elements. Lists and arrays implement this interface. We can use Extensions, such as ToList, on an IEnumerable type. C# CONVERT MILLISECONDS, SECONDS, MINUTES Convert milliseconds. Milliseconds, seconds, minutes, hours and days can be converted. These values may be from another data source such as a database or file from a different system. VB.NET STRING.EQUALS FUNCTION With the VB.NET String.Equals Function in its various syntax forms, including the equals operator, you can do this. We look at examples of string equality testing. This program first creates 2 String variables. These are created at runtime and both have the value "a1". Next, we show the instance Equals method, the Shared Equals method,the
VB.NET STRING JOIN EXAMPLES VB.NET String Join ExamplesMerge strings together with the Join function on the String type.Specify a separator with Join. RUBY SUBSTRING EXAMPLES First argument is start index, second is length. last_three = value puts last_three # Get substring at index 1 with length 2. middle_two = value puts middle_two ove ov. Regular expressions. We can get substrings with a regular expression argument in place of ranges or indexes. The substring returned is the match ofthe regexp.
VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do." C# STRING LIST EXAMPLE Consider this example program. We create a string List and add 3 values to it—these are stored in the order added. Enum. For We use a for-loop over the string List. See carefully how the index is used to access each item in the values List. For. Foreach The foreach C# URI AND URIBUILDER CLASSES Class info. In C# programs, you can manage URI data directly with strings. But IndexOf and Substring often involve bugs and errors. The Uri class simplifies this problem. C# COMPOUND INTEREST The bank pays an interest rate of 4.3%, compounded quarterly. It is left in the account for six years. Quarterly When interest is compounded quarterly, we pass 4 to the method. When interest is compounded monthly, we pass 12. Result We find that the $1,500 amounthas
VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET IENUMERABLE EXAMPLES VB.NET IEnumerable Examples Use the IEnumerable Interface with arrays, Lists, and For-Each loops. dot net perls. IEnumerable. An IEnumerable collection contains elements. We use the For-Each loop in VB.NET to loop over these elements. Lists and arrays implement this interface. We can use Extensions, such as ToList, on an IEnumerable type. C# CONVERT MILLISECONDS, SECONDS, MINUTES Convert milliseconds. Milliseconds, seconds, minutes, hours and days can be converted. These values may be from another data source such as a database or file from a different system. VB.NET STRING.EQUALS FUNCTION With the VB.NET String.Equals Function in its various syntax forms, including the equals operator, you can do this. We look at examples of string equality testing. This program first creates 2 String variables. These are created at runtime and both have the value "a1". Next, we show the instance Equals method, the Shared Equals method,the
VB.NET STRING JOIN EXAMPLES VB.NET String Join ExamplesMerge strings together with the Join function on the String type.Specify a separator with Join. RUBY SUBSTRING EXAMPLES First argument is start index, second is length. last_three = value puts last_three # Get substring at index 1 with length 2. middle_two = value puts middle_two ove ov. Regular expressions. We can get substrings with a regular expression argument in place of ranges or indexes. The substring returned is the match ofthe regexp.
VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do."C# FOCUSED PROPERTY
dot net perls. Focused. A TextBox has a Focused property. Many commands require us to know which TextBox is focused. These include text insertion, copy and paste, cut and undo, and find in this page. We develop methods to find the focused TextBox. Example. Every TextBox or control has a Focused property. VB.NET IENUMERABLE EXAMPLES VB.NET IEnumerable Examples Use the IEnumerable Interface with arrays, Lists, and For-Each loops. dot net perls. IEnumerable. An IEnumerable collection contains elements. We use the For-Each loop in VB.NET to loop over these elements. Lists and arrays implement this interface. We can use Extensions, such as ToList, on an IEnumerable type.C# CASE EXAMPLE
Usage. Cases can be stacked and combined. We can target a case with a goto statement. And "default" is a special kind of case—it is matched when nothing else does.C# ASCII TABLE
C# ASCII Table Generate an ASCII table with a for-loop. Display all characters in ASCII. dot net perls. ASCII table. This is a quick reference for ASCII character codes. We use a simple C# program to generate this dynamically. We see the ASCII character codes for the first 128 characters. Code sample. Please notice the C# consoleprogram that
VB.NET REGEX.MATCH EXAMPLES: REGULAR EXPRESSIONS Step 1 We create a Regex object. The Regex pattern "\w+" matches one or more word characters together. Step 2 We invoke the Match Function on the Regex instance. This returns a Match (which we test next). Step 3 We test if the match is successful. If it is, we print (with Console.WriteLine) its value—the string "do." C# USING ALIAS EXAMPLE C# Using Alias Example - Dot Net Perls. C# Using Alias Example Use the using alias feature, which helps resolve ambiguities in referencing type names. dot net perls. Using alias. A using alias directive introduces new type names. These point to an existing type or namespace. This provides more flexibility should the implementationneed to change.
VB.NET TOLOWER AND TOUPPER EXAMPLES VB.NET ToLower and ToUpper Examples Use the ToLower and ToUpper Functions on strings to change the cases of letters. dot net perls. ToLower, ToUpper. ToLower changes Strings that contain uppercase letters. We convert all the uppercase letters in a String to lowercase letters. With ToLower this is easy to do. Function notes. VB.NET STRING JOIN EXAMPLES VB.NET String Join ExamplesMerge strings together with the Join function on the String type.Specify a separator with Join. VB.NET SORT EXAMPLES: ARRAYS AND LISTS VB.NET program that uses lambda, sorts List. Module Module1 Sub Main () Dim numbers = New List (Of Integer) ( {20, 30, 40}) ' Use lambda to sort list in descending order. numbers. Sort ( Function (valueA, valueB) valueB.CompareTo (valueA)) For Each number As Integer In numbers Console.WriteLine ( "LAMBDA SORTED NUMBER: {0}", number) NextEnd
VB.NET STRING.ISNULLOREMPTY, ISNULLORWHITESPACE Nothing The String reference itself equals Nothing. This is another term for null. 2. Empty The String data is empty. IsNullOrWhiteSpace returns True in this case. This is not shown in the program. 3. Whitespace only The String data contains only whitespace. Any whitespace, including newlines VB.NET 2D, 3D AND JAGGED ARRAY EXAMPLES VB.NET 2D, 3D and Jagged Array Examples Use 2D arrays along with 3D and jagged arrays. Review the syntax for these arrays. dot net perls. 2D arrays. Sometimes data is part of a two-dimensional space. We can use VB.NET to represent this space—a 2D array can be allocated andused. Other arrays.
C# STATIC DICTIONARY C# Static Dictionary - Dot Net Perls. C# Static Dictionary Develop a static Dictionary that tests strings. Compute plural words from singular words. dot net perls. Static Dictionary. A static Dictionary can store global data. It lets you quickly look up strings (or other values). It is shared among many instances. VB.NET LIST EXAMPLES VB.NET program that uses For-Each and For, List. Module Module1 Sub Main () ' Part 1: create List and add 3 Integers. Dim list As New List (Of Integer) list. Add (2) list.Add (3) list.Add (7) ' Part 2: loop through List elements. For Each number As Integer In list Console.WriteLine ( "FOR EACH: {0}", number) Next ' Part 3: loopthrough list
C# FILESYSTEMWATCHER EXAMPLES C# FileSystemWatcher Examples Use the FileSystemWatcher class. Specify the Changed event handler to monitor for file changes. dot net perls. FileSystemWatcher. This class monitors a directory for changes. A program may need to process new files (often written to the directory by other programs). Many features. VB.NET SORT EXAMPLES: ARRAYS AND LISTS VB.NET program that uses lambda, sorts List. Module Module1 Sub Main () Dim numbers = New List (Of Integer) ( {20, 30, 40}) ' Use lambda to sort list in descending order. numbers. Sort ( Function (valueA, valueB) valueB.CompareTo (valueA)) For Each number As Integer In numbers Console.WriteLine ( "LAMBDA SORTED NUMBER: {0}", number) NextEnd
SCALA LIST EXAMPLES
Scala program that creates String List. object Program { def main (args: Array ): Unit = { // Create a String List with 3 elements. val names = List ( "cat", "bird", "fish") // Print the list. println (names) // Print element count (the list size). println (names. length) // Access VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET IENUMERABLE EXAMPLES VB.NET IEnumerable Examples Use the IEnumerable Interface with arrays, Lists, and For-Each loops. dot net perls. IEnumerable. An IEnumerable collection contains elements. We use the For-Each loop in VB.NET to loop over these elements. Lists and arrays implement this interface. We can use Extensions, such as ToList, on an IEnumerable type. GOLANG REGEXP EXAMPLES: MATCHSTRING, MUSTCOMPILE Golang Regexp Examples: MatchString, MustCompile Use the regexp package for regular expressions. Call MatchString and compile patterns. dot net perls. Regexp. In Go, we find an optimized regular expression engine. This runs in linear time, making complex patterns faster. It is located in the regexp package. With MatchString, we seeif a pattern
VB.NET DICTIONARY EXAMPLES Usually we create an empty Dictionary and then populate it with keys and values. Step 1 We create Dictionary with String keys, and Integer values. The Dictionary is empty here. Step 2 We invoke Add to populate the Dictionary. For the arguments, we pass the key we want to add, andthe value.
VB.NET 2D, 3D AND JAGGED ARRAY EXAMPLES VB.NET 2D, 3D and Jagged Array Examples Use 2D arrays along with 3D and jagged arrays. Review the syntax for these arrays. dot net perls. 2D arrays. Sometimes data is part of a two-dimensional space. We can use VB.NET to represent this space—a 2D array can be allocated andused. Other arrays.
C# STATIC DICTIONARY C# Static Dictionary - Dot Net Perls. C# Static Dictionary Develop a static Dictionary that tests strings. Compute plural words from singular words. dot net perls. Static Dictionary. A static Dictionary can store global data. It lets you quickly look up strings (or other values). It is shared among many instances. VB.NET LIST EXAMPLES VB.NET program that uses For-Each and For, List. Module Module1 Sub Main () ' Part 1: create List and add 3 Integers. Dim list As New List (Of Integer) list. Add (2) list.Add (3) list.Add (7) ' Part 2: loop through List elements. For Each number As Integer In list Console.WriteLine ( "FOR EACH: {0}", number) Next ' Part 3: loopthrough list
C# FILESYSTEMWATCHER EXAMPLES C# FileSystemWatcher Examples Use the FileSystemWatcher class. Specify the Changed event handler to monitor for file changes. dot net perls. FileSystemWatcher. This class monitors a directory for changes. A program may need to process new files (often written to the directory by other programs). Many features. VB.NET SORT EXAMPLES: ARRAYS AND LISTS VB.NET program that uses lambda, sorts List. Module Module1 Sub Main () Dim numbers = New List (Of Integer) ( {20, 30, 40}) ' Use lambda to sort list in descending order. numbers. Sort ( Function (valueA, valueB) valueB.CompareTo (valueA)) For Each number As Integer In numbers Console.WriteLine ( "LAMBDA SORTED NUMBER: {0}", number) NextEnd
SCALA LIST EXAMPLES
Scala program that creates String List. object Program { def main (args: Array ): Unit = { // Create a String List with 3 elements. val names = List ( "cat", "bird", "fish") // Print the list. println (names) // Print element count (the list size). println (names. length) // Access VB.NET FUNC, ACTION AND PREDICATE EXAMPLES VB.NET program that uses Predicate. Module Module1 Sub Main () ' This Predicate receives an Integer, and returns a Boolean. ' It tells us if an Integer is positive. Dim isPositive As Predicate (Of Integer) = Function (x) x >= 0 If isPositive. Invoke (10) Then Console.WriteLine ( "NUMBER IS POSITIVE" ) End If ' This Predicate receives a String. VB.NET IENUMERABLE EXAMPLES VB.NET IEnumerable Examples Use the IEnumerable Interface with arrays, Lists, and For-Each loops. dot net perls. IEnumerable. An IEnumerable collection contains elements. We use the For-Each loop in VB.NET to loop over these elements. Lists and arrays implement this interface. We can use Extensions, such as ToList, on an IEnumerable type. GOLANG REGEXP EXAMPLES: MATCHSTRING, MUSTCOMPILE Golang Regexp Examples: MatchString, MustCompile Use the regexp package for regular expressions. Call MatchString and compile patterns. dot net perls. Regexp. In Go, we find an optimized regular expression engine. This runs in linear time, making complex patterns faster. It is located in the regexp package. With MatchString, we seeif a pattern
VB.NET DICTIONARY EXAMPLES Usually we create an empty Dictionary and then populate it with keys and values. Step 1 We create Dictionary with String keys, and Integer values. The Dictionary is empty here. Step 2 We invoke Add to populate the Dictionary. For the arguments, we pass the key we want to add, andthe value.
VB.NET DO WHILE LOOP EXAMPLES (WHILE) VB.NET Do While Loop Examples (While) - Dot Net Perls. VB.NET Do While Loop Examples (While) Use the Do While and While loops. Keep looping as long as a condition remains True. dot net perls. While, Do While. Suppose we wish to continue looping until a condition is met. The number of iterations though may be unknown (as of yet). VB.NET EXCEL INTEROP EXAMPLE Go to Project -> Add Reference. Example. This program requires the Microsoft.Office.Interop.Excel assembly. You should add the Imports statement after adding that assembly. To use Excel, you need to create a new Application instance, and then call Workbooks.Open. Next You can loop over all the Sheets in the Workbook instance. VB.NET ENUM EXAMPLES VB.NET Enum Examples Use Enum values to store named and magic constants. Use if-statements with enums. dot net perls. Enum. An Enum type stores special values. These are named constants. With an Enum, we replace magic constants throughout a program. Enum benefits. Enums make code clearer: they organize code and make programs easier tomaintain.
VB.NET OBJECT ARRAY
VB.NET Object Array - Dot Net Perls. Example. There are two subroutines in this program. The Main sub is the program's entry point. And in Write, we loop over an Object array and display each element with the Console.WriteLine function. Main An Object array of 5 elements is declared. Each of the 5 elements are assigned to anObject.
VB.NET TOLOWER AND TOUPPER EXAMPLES VB.NET ToLower and ToUpper Examples Use the ToLower and ToUpper Functions on strings to change the cases of letters. dot net perls. ToLower, ToUpper. ToLower changes Strings that contain uppercase letters. We convert all the uppercase letters in a String to lowercase letters. With ToLower this is easy to do. Function notes. VB.NET CONVERT LIST TO STRING Dim vals As List (Of String) = arr.ToList () ' Display each List element. For Each val As String In vals Console.WriteLine (val) Next End Sub End Module Dot Net Perls. Summary. We converted between Lists and Strings. Typically, using String.Join and Split are the mosteffective ways to
VB.NET TIMESPAN EXAMPLES Days, hours, minutes, seconds, milliseconds. Dim span As TimeSpan = New TimeSpan (1, 2, 1, 0, 0) Console.WriteLine (span) End Sub End Module 1.02:01:00. TimeSpan.From. We can create a new TimeSpan instance in another way. The From functions allow VB.NET MATH.ROUND EXAMPLE Example. This program calls Math.Round on the Double 123.45. With no options, it rounds this number to 123. With a second option of 1, we round to one decimal place. This yields the values 123.5 (for AwayFromZero) and 123.4 (for ToEven). AwayFromZero With a positive number, this option will round up—so 123.45 becomes 123.5. C# CONVERT LIST TO ARRAY List to array. Here we convert a string List into a string array of the same number of elements. At the end, the program prints the array's length. Step 1 We create a List and populate it with some strings. The List here can only hold strings (or null). Step 2 Next we use ToArray on the List. VB.NET KEYVALUEPAIR EXAMPLES VB.NET KeyValuePair Examples Use KeyValuePair, which has two member fields. Access the Key and Value properties. dot net perls. KeyValuePair. A KeyValuePair is a Structure. It has 2 fields of specified types. It stores 2 pieces of data together as a single object. Data types. KeyValuePair defines a Structure of any kind of key, and any kind ofHome Search
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