Passing Parameter to a Predicate in .Net2.0

In this post, we will see how to pass parameter to a method representing Predicate.

Let's say, we have a collection of SprintBacklogItems and we want to filter all the SprintBacklogItem with Title start's with, let say "QA" or "Dev Task" depending on a input parameter. Now from the previous post http://adilakhter.wordpress.com/2008/01/11/using-predicate-actor-of-net20/  we know that , predicate only have 1 parameter of type T.

Then, how to pass a input parameter _HeaderToSearch in Predicate?

1. To do that, we need to a new object called ListMatcher -

{

_HeaderToSearch;

ListMatcher(

headerToSearch) { _HeaderToSearch = headerToSearch; }

Predicate(

item) {

item.Title.StartsWith(_HeaderToSearch,

.InvariantCultureIgnoreCase); } }

2. Next , I initialized the ListMatcher object and use the HeaderToSearch  to filter the items- 

matcher =

(

);

.FindAll(matcher.Predicate);

Done.:)