IGrouping<TKey, TElement>::Key Property

 

Gets the key of the IGrouping<TKey, TElement>.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

property TKey Key {
	TKey get();
}

Property Value

Type: TKey

The key of the IGrouping<TKey, TElement>.

The key of an IGrouping<TKey, TElement> represents the attribute that is common to each value in the IGrouping<TKey, TElement>.

The following example demonstrates how to use the Key property to label each IGrouping<TKey, TElement> object in a sequence of IGrouping<TKey, TElement> objects. The GroupBy<TSource, TKey>(IEnumerable<TSource>^, Func<TSource, TKey>^) method is used to obtain a sequence of IGrouping<TKey, TElement> objects. The foreach in Visual C# or For Each in Visual Basic loop then iterates through each IGrouping<TKey, TElement> object, outputting its key and the number of values it contains.

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

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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