String::Join<T> Method (String, IEnumerable<T>)
Concatenates the members of a collection, using the specified separator between each member.
Assembly: mscorlib (in mscorlib.dll)
[ComVisibleAttribute(false)] public: generic<typename T> static String^ Join( String^ separator, IEnumerable<T>^ values )
The type of the members of values.
- 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.
- Type: System.Collections.Generic::IEnumerable<>
A collection that contains the objects to concatenate.
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.
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 method.
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 method.
.NET FrameworkSupported in: 4.5, 4
.NET Framework Client ProfileSupported in: 4
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported 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.