String.Concat Method (Object[])

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

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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