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

May 11, 2014

Concatenates four specified instances of String.

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

'Déclaration
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 Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      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, Nothing)
         ' Display the scrambled word.
         Dim scrambledWord As String = String.Concat(letters(0), letters(1), _
                                                     letters(2), letters(3))
         outputBlock.Text += String.Format("{0} --> {1}", word, scrambledWord) & vbCrLf
      Next
   End Sub
End Module
' The example displays output like the following:
'       home --> mheo
'       food --> oodf
'       game --> aemg
'       rest --> trse


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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