Enumerable.All<'TSource> Method (IEnumerable<'TSource>, Func<'TSource, Boolean>)
Determines whether all elements of a sequence satisfy a condition.
Assembly: System.Core (in System.Core.dll)
static member All<'TSource> : source:IEnumerable<'TSource> * predicate:Func<'TSource, bool> -> bool
An IEnumerable<'T> that contains the elements to apply the predicate to.
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 does not return all the elements of a collection. Instead, it determines whether all the elements of a collection satisfy a condition.
The enumeration of source is stopped as soon as the result can be determined.
In Visual Basic query expression syntax, an Aggregate Into All() clause translates to an invocation of .
The following code example demonstrates how to use allStartWithB is true if all the pet names start with "B" or if the pets array is empty.to determine whether all the elements in a sequence satisfy a condition. Variable
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 7.0
Available since 8.1