CODEWITHSUNDEEP
c#.net-3.5.net-4.0extension-methods
AngryHacker
AngryHacker

Reputation: 61606

How to downgrade this piece of code from .net 4.0 to 3.5?

I've been really loving this extension method in my .NET 4.0 code:

public static bool In<T>(this T source, params T[] list)
{
  if(null==source) throw new ArgumentNullException("source");
  return list.Contains(source);
}

Now, I'd really like to use it in my .net 3.5 project, but it's missing the Contains method. How can I cleanly downgrade this extension method without complicating things too much?

Upvotes: 1

Views: 596

Answers (2)

Enigmativity
Enigmativity

Reputation: 117064

I agree with James Gaunt, this should run under 3.5 as is.

Perhaps you have neglected to add the using System.Linq; and using System.Collections.Generic; declarations at the top of your code?

I get caught by that all the time.

Upvotes: 2

James Gaunt
James Gaunt

Reputation: 14783

Contains is an extension on IEnumerable introduced in 3.5 as part of LINQ. This code will compile under 3.5.

If it's not then make sure you have included

using System.Linq

Upvotes: 9

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