Queryable.TakeWhile(TSource) Method (IQueryable(TSource), Expression(Func(TSource, Boolean)))
Returns elements from a sequence as long as a specified condition is true.
Assemblies: System.Linq.Queryable (in System.Linq.Queryable.dll)
System.Core (in System.Core.dll)
static member TakeWhile : source:IQueryable<'TSource> * predicate:Expression<Func<'TSource, bool>> -> IQueryable<'TSource>
The type of the elements of source.
- Type: System.Linq.IQueryable()
The sequence to return elements from.
Return ValueType: System.Linq.IQueryable()
An IQueryable(T) that contains elements from the input sequence occurring before the element at which the test specified by predicate no longer passes.
Usage NoteIn Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable(). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
source or predicate is a null reference (Nothing in Visual Basic).
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 method generates a 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.
The query behavior that occurs as a result of executing an expression tree that represents calling depends on the implementation of the type of the source parameter. The expected behavior is that it applies predicate to each element in source until it finds an element for which predicate returns false. It returns all the elements up until that point.