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String.Join Method (String, String[])

Concatenates a specified separator String between each element of a specified String array, yielding a single concatenated string.

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

public static string Join (
	string separator,
	string[] value
)
public static String Join (
	String separator, 
	String[] value
)
public static function Join (
	separator : String, 
	value : String[]
) : String

Parameters

separator

A String.

value

An array of String.

Return Value

A String consisting of the elements of value interspersed with the separator string.

Exception typeCondition

ArgumentNullException

value is a null reference (Nothing in Visual Basic).

For example if separator is ", " and the elements of value are "apple", "orange", "grape", and "pear", Join(separator, value) returns "apple, orange, grape, pear".

If separator is a null reference (Nothing in Visual Basic), the empty string (Empty) is used instead.

The following code example demonstrates the Join method.

using System;

public class JoinTest {
    public static void Main() {

        Console.WriteLine(MakeLine(0, 5, ", "));
        Console.WriteLine(MakeLine(1, 6, "  "));
        Console.WriteLine(MakeLine(9, 9, ": "));
        Console.WriteLine(MakeLine(4, 7, "< "));
    }

    private static string MakeLine(int initVal, int multVal, string sep) {

        string [] sArr = new string [10];

        for (int i = initVal; i < initVal + 10; i++)
            sArr[i - initVal] = String.Format("{0,-3}", i * multVal);

        return String.Join(sep, sArr);
    }
}

import System.*;

public class JoinTest
{
    public static void main(String[] args)
    {
        Console.WriteLine(MakeLine(0, 5, ", "));
        Console.WriteLine(MakeLine(1, 6, "  "));
        Console.WriteLine(MakeLine(9, 9, ": "));
        Console.WriteLine(MakeLine(4, 7, "< "));
    } //main

    private static String MakeLine(int initVal, int multVal, String sep)
    {
        String sArr[] = new String[10];

        for (int i = initVal; i < initVal + 10; i++) {
            sArr.set_Item((i - initVal), String.Format("{0,-3}", 
                (Int32)(i * multVal)));
        }
        return String.Join(sep, sArr);
    } //MakeLine
} //JoinTest

import System;

public class JoinTest {
    public static function Main() : void {
        Console.WriteLine(MakeLine(0, 5, ", "));
        Console.WriteLine(MakeLine(1, 6, "  "));
        Console.WriteLine(MakeLine(9, 9, ": "));
        Console.WriteLine(MakeLine(4, 7, "< "));
    }

    private static function MakeLine(initVal : int, multVal : int, sep : String) : String  {

        var sArr : String [] = new String [10];

        for (var i : int = initVal; i < initVal + 10; i++)
            sArr[i - initVal] = String.Format("{0,-3}", i * multVal);

        return String.Join(sep, sArr);
    }
}
JoinTest.Main();

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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