Queryable::Union<TSource> Method (IQueryable<TSource>^, IEnumerable<TSource>^)
Produces the set union of two sequences by using the default equality comparer.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource> [ExtensionAttribute] static IQueryable<TSource>^ Union( IQueryable<TSource>^ source1, IEnumerable<TSource>^ source2 )
Parameters
- source1
-
Type:
System.Linq::IQueryable<TSource>^
A sequence whose distinct elements form the first set for the union operation.
- source2
-
Type:
System.Collections.Generic::IEnumerable<TSource>^
A sequence whose distinct elements form the second set for the union operation.
Return Value
Type: System.Linq::IQueryable<TSource>^An IQueryable<T> that contains the elements from both input sequences, excluding duplicates.
Type Parameters
- TSource
The type of the elements of the input sequences.
| Exception | Condition |
|---|---|
| ArgumentNullException | source1 or source2 is null. |
The Union<TSource>(IQueryable<TSource>^, IEnumerable<TSource>^) method generates a MethodCallExpression that represents calling Union<TSource>(IQueryable<TSource>^, IEnumerable<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 source1 parameter.
The query behavior that occurs as a result of executing an expression tree that represents calling Union<TSource>(IQueryable<TSource>^, IEnumerable<TSource>^) depends on the implementation of the type of the source1 parameter. The expected behavior is that the set union of the elements in source1 and source2 is returned.
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