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

Concatenates four specified instances of String.

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

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function Concat ( _
    str0 As String, _
    str1 As String, _
    str2 As String, _
    str3 As String _
) As String
[SecuritySafeCriticalAttribute]
public static string Concat(
    string str0,
    string str1,
    string str2,
    string str3
)

Parameters

Return Value

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

Remarks

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.

Examples

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
using System;
using System.Collections.Generic;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      const int WORD_SIZE = 4;

      // Define some 4-letter words to be scrambled.
      string[] words = { "home", "food", "game", "rest" };
      // Define two arrays equal to the number of letters in each word.
      double[] keys = new double[WORD_SIZE];
      string[] letters = new string[WORD_SIZE];
      // Initialize the random number generator.
      Random rnd = new Random();

      // Scramble each word.
      foreach (string word in words)
      {
         for (int ctr = 0; ctr < word.Length; ctr++)
         {
            // Populate the array of keys with random numbers.
            keys[ctr] = rnd.NextDouble();
            // Assign a letter to the array of letters.
            letters[ctr] = word[ctr].ToString();
         }
         // Sort the array. 
         Array.Sort(keys, letters, null);
         // Display the scrambled word.
         string scrambledWord = String.Concat(letters[0], letters[1],
                                              letters[2], letters[3]);
         outputBlock.Text += String.Format("{0} --> {1}", word, scrambledWord) + "\n";
      }
   }
}
// The example displays output like the following:
//       home --> mheo
//       food --> oodf
//       game --> aemg
//       rest --> trse

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.