Queryable.Max(TSource, TResult) Method (IQueryable(TSource), Expression(Func(TSource, TResult)))
Invokes a projection function on each element of a generic IQueryable(T) and returns the maximum resulting value.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
static member Max : source:IQueryable<'TSource> * selector:Expression<Func<'TSource, 'TResult>> -> 'TResult
Type Parameters
- TSource
The type of the elements of source.
- TResult
The type of the value returned by the function represented by selector.
Parameters
- source
- Type: System.Linq.IQueryable(TSource)
A sequence of values to determine the maximum of.
- selector
- Type: System.Linq.Expressions.Expression(Func(TSource, TResult))
A projection function to apply to each element.
Return Value
Type: TResultThe maximum value in the sequence.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable(TSource). 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).| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector 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 Max(TSource, TResult)(IQueryable(TSource), Expression(Func(TSource, TResult))) method generates a MethodCallExpression that represents calling Max(TSource, TResult)(IQueryable(TSource), Expression(Func(TSource, TResult))) 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.
The query behavior that occurs as a result of executing an expression tree that represents calling Max(TSource, TResult)(IQueryable(TSource), Expression(Func(TSource, TResult))) depends on the implementation of the type of the source parameter. The expected behavior is that it invokes selector on each element in source and returns the maximum value.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
