StringConcat Method
 
System_CAPS_noteNote

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Concatenates four specified instances of String.

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

public static string Concat(
	string str0,
	string str1,
	string str2,
	string str3
)
public:
static String^ Concat(
	String^ str0,
	String^ str1,
	String^ str2,
	String^ str3
)
static member Concat : 
        str0:string *
        str1:string *
        str2:string *
        str3:string -> string
Public Shared Function Concat (
	str0 As String,
	str1 As String,
	str2 As String,
	str3 As String
) As String

Parameters

str0
Type:

The first string to concatenate.

str1
Type:

The second string to concatenate.

str2
Type:

The third string to concatenate.

str3
Type:

The fourth string to concatenate.

Return Value

Type:

The concatenation of str0, str1, str2, and str3.

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

System_CAPS_noteNote

You can also use your language's string concatenation operator, such as + in C#, or & and + in Visual Basic)

, to concatenate strings.

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 method to reassemble the scrambled words.

using System;
using System.Collections;

public class Example
{
   public static void Main()
   {
      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, 0, WORD_SIZE, Comparer.Default);      
         // Display the scrambled word.
         string scrambledWord = String.Concat(letters[0], letters[1], 
                                              letters[2], letters[3]);
         Console.WriteLine("{0} --> {1}", word, scrambledWord);
      } 
   }
}
// The example displays output like the following:
//       home --> mheo
//       food --> oodf
//       game --> aemg
//       rest --> trse
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
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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