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String.Join(T) Method (String, IEnumerable(T))

Concatenates the members of a collection, using the specified separator between each member.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
[<ComVisibleAttribute(false)>]
static member Join : 
        separator:string * 
        values:IEnumerable<'T> -> string

Type Parameters

T

The type of the members of values.

Parameters

separator
Type: System.String

The string to use as a separator. separator is included in the returned string only if values has more than one element.

values
Type: System.Collections.Generic.IEnumerable(T)

A collection that contains the objects to concatenate.

Return Value

Type: System.String
A string that consists of the members of values delimited by the separator string. If values has no members, the method returns String.Empty.
ExceptionCondition
ArgumentNullException

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

If separator is a null reference (Nothing in Visual Basic), an empty string (String.Empty) is used instead. If any member of values is a null reference (Nothing in Visual Basic), an empty string is used instead.

Join(T)(String, IEnumerable(T)) is a convenience method that lets you concatenate each member of an IEnumerable(T) collection without first converting them to strings. The string representation of each object in the IEnumerable(T) collection is derived by calling that object's ToString method.

This method is particular useful with Language-Integrated Query (LINQ) query expressions. For example, the following code defines a very simple Animal class that contains the name of an animal and the order to which it belongs. It then defines a List(T) object that contains a number of Animal objects. The Enumerable.Where extension method is called to extract the Animal objects whose Order property equals "Rodent". The result is passed to the Join(T)(String, IEnumerable(T)) method.

No code example is currently available or this language may not be supported.

The following example uses the Sieve of Eratosthenes algorithm to calculate the prime numbers that are less than or equal to 100. It assigns the result to a List(T) object of type integer, which it then passes to the Join(T)(String, IEnumerable(T)) method.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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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