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String.Concat Method (String, String, String, String)

Concatenates four specified instances of String.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Shared Function Concat ( _
	str0 As String, _
	str1 As String, _
	str2 As String, _
	str3 As String _
) As String

Parameters

str0
Type: System.String

The first string to concatenate.

str1
Type: System.String

The second string to concatenate.

str2
Type: System.String

The third string to concatenate.

str3
Type: System.String

The fourth string to concatenate.

Return Value

Type: System.String
The concatenation of str0, str1, str2, and str3.

The method concatenates str0, str1, str2, and str3; it does not add any delimiters.

An Empty string is used in place of any null object in the array.

The following example defines an array of four-letter words and stores their individual letters to a string array in order to scramble them. It then calls the Concat(String, String, String, String) method to reassemble the scrambled words.

Imports System.Collections

Module Example
   Public Sub Main()
      Const WORD_SIZE As Integer = 4

      ' Define some 4-letter words to be scrambled. 
      Dim words() As String = { "home", "food", "game", "rest" }
      ' Define two arrays equal to the number of letters in each word. 
      Dim keys(WORD_SIZE) As Double 
      Dim letters(WORD_SIZE) As String 
      ' Initialize the random number generator. 
      Dim rnd As New Random()

      ' Scramble each word. 
      For Each word As String In words
         For ctr As Integer = 0 To word.Length - 1
            ' Populate the array of keys with random numbers.
            keys(ctr) = rnd.NextDouble()
            ' Assign a letter to the array of letters.
            letters(ctr) = word.Chars(ctr)
         Next    
         ' Sort the array. 
         Array.Sort(keys, letters, 0, WORD_SIZE, Comparer.Default)      
         ' Display the scrambled word. 
         Dim scrambledWord As String = String.Concat(letters(0), letters(1), _
                                                     letters(2), letters(3))
         Console.WriteLine("{0} --> {1}", word, scrambledWord)
      Next  
   End Sub 
End Module  
' The example displays output like the following: 
'       home --> mheo 
'       food --> oodf 
'       game --> aemg 
'       rest --> trse

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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