Queryable::Distinct<TSource> Method (IQueryable<TSource>^)
Returns distinct elements from a sequence by using the default equality comparer to compare values.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource> [ExtensionAttribute] static IQueryable<TSource>^ Distinct( IQueryable<TSource>^ source )
Parameters
- source
-
Type:
System.Linq::IQueryable<TSource>^
The IQueryable<T> to remove duplicates from.
Return Value
Type: System.Linq::IQueryable<TSource>^An IQueryable<T> that contains distinct elements from source.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source is null. |
The Distinct<TSource>(IQueryable<TSource>^) method generates a MethodCallExpression that represents calling Distinct<TSource>(IQueryable<TSource>^) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression^) method of the IQueryProvider represented by the Provider property of the source parameter.
The query behavior that occurs as a result of executing an expression tree that represents calling Distinct<TSource>(IQueryable<TSource>^) depends on the implementation of the type of the source parameter. The expected behavior is that it returns an unordered sequence of the unique items in source.
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 7.1
Windows Phone
Available since 8.1