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String::Join Method (String, IEnumerable<String>)

Concatenates the members of a constructed IEnumerable<T> collection of type String, using the specified separator between each member.

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

[ComVisibleAttribute(false)]
public:
static String^ Join(
	String^ separator, 
	IEnumerable<String^>^ values
)

Parameters

separator
Type: System::String
The string to use as a separator.
values
Type: System.Collections.Generic::IEnumerable<String>
A collection that contains the strings 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 nullptr.

If separator is nullptr, an empty string (String::Empty) is used instead. If any member of values is nullptr, an empty string is used instead.

Join(String, IEnumerable<String>) is a convenience method that lets you concatenate each element in an IEnumerable(Of String) collection without first converting the elements to a string array. It is particularly useful with Language-Integrated Query (LINQ) query expressions. The following example passes a List(Of String) object that contains either the uppercase or lowercase letters of the alphabet to a lambda expression that selects letters that are equal to or greater than a particular letter (which, in the example, is "M"). The IEnumerable(Of String) collection returned by the Enumerable::Where method is passed to the Join(String, IEnumerable<String>) method to display the result as a single string.

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 String, which it then passes to the Join(String, IEnumerable<String>) method.

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

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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