Queryable.All<'TSource> Method (IQueryable<'TSource>, Expression<Func<'TSource, Boolean>>)
Determines whether all the elements of a sequence satisfy a condition.
Assembly: System.Core (in System.Core.dll)
static member All<'TSource> : source:IQueryable<'TSource> * predicate:Expression<Func<'TSource, bool>> -> bool
A sequence whose elements to test for a condition.
Return ValueType: System.Boolean
true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.
The type of the elements of source.
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 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 callingdepends on the implementation of the source parameter's type. The expected behavior is that it determines if all the elements in source satisfy the condition in predicate.
The following code example demonstrates how to useto determine whether all the elements in a sequence satisfy a condition.
The Boolean value that the Where<'TSource> method. The following example demonstrates this use of the All method.method returns is typically used in the predicate of a where clause (Where clause in Visual Basic) or a direct call to the
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