Returns a sequence from a dictionary based on the result of evaluating a selector function, also specifying a default sequence.

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

public static IEnumerable<TResult> Case<TValue, TResult>(
	Func<TValue> selector,
	IDictionary<TValue, IEnumerable<TResult>> sources,
	IEnumerable<TResult> defaultSource
)

Type: System.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: System.Collections.Generic.IEnumerable<TResult>
Default sequence to return in case there's no corresponding source for the computed selector value.

Type of the selector value.

Result sequence element type.

Type: IEnumerable<TResult>
The source sequence corresponding with the evaluated selector value; otherwise, the default source.

EnumerableEx Class
System.Linq Namespace