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String.Concat Method (Object)

Creates the string representation of a specified object.

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

public static string Concat(
	Object arg0
)

Parameters

arg0
Type: System.Object

The object to represent, or null.

Return Value

Type: System.String
The string representation of the value of arg0, or String.Empty if arg0 is null.

The Concat(Object) method represents arg0 as a string by calling its parameterless ToString method.

The following example demonstrates the Concat method.

using System;

class stringConcat5 {
    public static void Main() {
    int i = -123;
    Object o = i;
    Object[] objs = new Object[] {-123, -456, -789};

    Console.WriteLine("Concatenate 1, 2, and 3 objects:");
    Console.WriteLine("1) {0}", String.Concat(o));
    Console.WriteLine("2) {0}", String.Concat(o, o));
    Console.WriteLine("3) {0}", String.Concat(o, o, o));

    Console.WriteLine("\nConcatenate 4 objects and a variable length parameter list:");
    Console.WriteLine("4) {0}", String.Concat(o, o, o, o));
    Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o));

    Console.WriteLine("\nConcatenate a 3-element object array:");
    Console.WriteLine("6) {0}", String.Concat(objs));
    }
}
// The example displays the following output: 
//    Concatenate 1, 2, and 3 objects: 
//    1) -123 
//    2) -123-123 
//    3) -123-123-123 
//     
//    Concatenate 4 objects and a variable length parameter list: 
//    4) -123-123-123-123 
//    5) -123-123-123-123-123 
//     
//    Concatenate a 3-element object array: 
//    6) -123-456-789

.NET Framework

Supported in: 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 Silverlight 8.1, Windows Phone Silverlight 8

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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