Queryable::SelectMany<TSource, TResult> Method (IQueryable<TSource>^, Expression<Func<TSource, Int32, IEnumerable<TResult>^>^>^)
Projects each element of a sequence to an IEnumerable<T> and combines the resulting sequences into one sequence. The index of each source element is used in the projected form of that element.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource, typename TResult> [ExtensionAttribute] static IQueryable<TResult>^ SelectMany( IQueryable<TSource>^ source, Expression<Func<TSource, int, IEnumerable<TResult>^>^>^ selector )
A sequence of values to project.
Return ValueType: System.Linq::IQueryable< >^
An IQueryable<T> whose elements are the result of invoking a one-to-many projection function on each element of the input sequence.
The type of the elements of source.
The type of the elements of the sequence returned by the function represented by selector.
This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T, TResult> types. For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.
The MethodCallExpression that represents calling itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery(Expression^) method of the IQueryProvider represented by the Provider property of the source parameter.method generates a
The query behavior that occurs as a result of executing an expression tree that represents callingdepends on the implementation of the type of the source parameter. The expected behavior is that it invokes selector on each element of source to project it into an enumerable form. Each enumerable result incorporates the index of the source element. It then concatenates the enumerable results into a single, one-dimensional sequence.
Available since 8
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Available since 8.1