LINQ : Implementing IN and NOT IN
February 12th, 2009
8 comments
I got tried of typing
var result = from s in source where items.Contains(s) select s;
and so I implemented the IN and NOT IN methods as extension methods:
public static IQueryable<T> In<T>(this IQueryable<T> source, IQueryable<T> checkAgainst) { return from s in source where checkAgainst.Contains(s) select s; } public static IQueryable<T> NotIn<T>(this IQueryable<T> source, IQueryable<T> checkAgainst) { return from s in source where !checkAgainst.Contains(s) select s; }
Thus, I can now just do the following:
var result = source.In(items);
What do you think – Good idea, Bad idea, Useless idea?
C#, extension methods, IN, LINQ, NOT IN
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