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


Concatenates four specified instances of String.

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

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


Type: System.String

The first string to concatenate.

Type: System.String

The second string to concatenate.

Type: System.String

The third string to concatenate.

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)
         ' 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)
   End Sub
End Module 
' The example displays output like the following:
'       home --> mheo
'       food --> oodf
'       game --> aemg
'       rest --> trse

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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