Returns a sequence from a dictionary based on the result of evaluating a selector function.

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

public static IQueryable<TResult> Case<TValue, TResult>(
	this IQueryProvider provider,
	Expression<Func<TValue>> selector,
	IDictionary<TValue, IEnumerable<TResult>> sources
)

Type: System.Linq.IQueryProvider
Query provider.

Type: System.Linq.Expressions.Expression<Func<TValue>>
Selector function used to pick a sequence from the given sources.

Type: System.Collections.Generic.IDictionary<TValue, IEnumerable<TResult>>
Dictionary mapping selector values onto resulting sequences.

Type of the selector value.

Result sequence element type.

Type: IQueryable<TResult>
The source sequence corresponding with the evaluated selector value; otherwise, an empty sequence.

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryProvider. 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