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String.Concat Method (Object[])

Updated: October 2009

Concatenates the string representations of the elements in a specified Object array.

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

public static string Concat(
	params Object[] args
)

Parameters

args
Type: System.Object[]

An object array that contains the elements to concatenate.

Return Value

Type: System.String
The concatenated string representations of the values of the elements in args.

ExceptionCondition
ArgumentNullException

args is null.

OutOfMemoryException

Out of memory.

The method concatenates each object in args by calling the parameterless ToString method of that object; it does not add any delimiters.

String.Empty is used in place of any null object in the array.

Notes to Callers:

This method is not called by C++ code. The C++ compiler resolves calls to Concat that have four or more object parameters as a call to Concat(Object, Object, Object, Object).

The following example demonstrates the use of the Concat method with an Object array.

using System;

public class ConcatTest {
    public static void Main() {
        // Create a group of objects.
        Test1 t1 = new Test1();
        Test2 t2 = new Test2();
        int i = 16;
        string s = "Demonstration";

        // Place the objects in an array.
        object [] o = { t1, i, t2, s };

        // Concatenate the objects together as a string. To do this, 
        // the ToString method of each of the objects is called.
        Console.WriteLine(string.Concat(o));
    }
}

// Create two empty test classes. 
class Test1 {
}

class Test2 {
}
// The example displays the following output: 
//       Test116Test2Demonstration

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

October 2009

Added the Notes for Callers section.

Information enhancement.

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