Memoizes the source sequence within a selector function where each enumerator can get access to all of the sequence's elements without causing multiple enumerations over the source.

Namespace: System.Linq
Assembly: System.Interactive.Providers (in System.Interactive.Providers.dll)

public static IQueryable<TResult> Memoize<TSource, TResult>(
	this IQueryable<TSource> source,
	Expression<Func<IEnumerable<TSource>, IEnumerable<TResult>>> selector
)

Type: System.Linq.IQueryable<TSource>
Source sequence.

Type: System.Linq.Expressions.Expression<Func<IEnumerable<TSource>, IEnumerable<TResult>>>
Selector function with memoized access to the source sequence for each enumerator.

Source sequence element type.

Result sequence element type.

Type: IQueryable<TResult>
Sequence resulting from applying the selector function to the memoized view over the source sequence.

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).

QueryableEx Class
System.Linq Namespace