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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 static string Concat(
	string str0,
	string str1,
	string str2,
	string str3


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.

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

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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