Queryable.LongCount<TSource> Method (IQueryable<TSource>)
Returns an Int64 that represents the total number of elements in a sequence.
Assembly: System.Core (in System.Core.dll)
Return ValueType: System.Int64
The number of elements in source.
The type of the elements of source.
The MethodCallExpression that represents calling itself as a constructed generic method. It then passes the MethodCallExpression to the Execute<TResult>(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 calling Int64.depends on the implementation of the type of the source parameter. The expected behavior is that it counts the number of items in source and returns an
The following code example demonstrates how to useto count the elements in an array.
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