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enumerationHookEnumerationHookT Method (IEnumerableT, ActionT, ActionT, Action, Action)

Binds actions to an IEnumerableT, causing the action to call whenever the IEnumerableT is enumerated.

Namespace:  WhetStone.Looping
Assembly:  WhetStone (in WhetStone.dll) Version: 1.0.4.0 (1.0.0.0)
Syntax
C#
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public static IEnumerable<T> EnumerationHook<T>(
	this IEnumerable<T> this,
	Action<T> preYield = null,
	Action<T> postYield = null,
	Action begin = null,
	Action end = null
)

Parameters

this
Type: System.Collections.GenericIEnumerableT
The IEnumerableT to hook to.
preYield (Optional)
Type: SystemActionT
An ActionT to call before the element is returned to the enumeration caller.
postYield (Optional)
Type: SystemActionT
An ActionT to call before the element is returned to the enumeration caller (if the next item is requested).
begin (Optional)
Type: SystemAction
An Action to call before any element is enumerated.
end (Optional)
Type: SystemAction
An Action to call after all elements are enumerated.

Type Parameters

T
The type of the IEnumerableT.

Return Value

Type: IEnumerableT
An enumerable with the same elements, but whenever enumerated, will trigger a hooked method.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerableT. 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).
Examples
Say you want to find the sum and count of an IEnumerableTval while only enumerating it once.
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int count = 0;
int sum = val.EnumerationHook(a=>count++).Sum();
See Also