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Asked: 2026-05-11T02:14:08+00:00

First off, according to http://msdn.microsoft.com/en-us/library/x0b5b5bc.aspx , the List.Find method is only listed as throwing

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First off, according to http://msdn.microsoft.com/en-us/library/x0b5b5bc.aspx, the List.Find method is only listed as throwing ArgumentNullException. However I have the following test code which, when using Find with an anonymous delegate, throws a NullReferenceException when the object being searched for is not found.

namespace MyTestNS {   class MyTestClass   {     [TestMethod()]     public void ArrayMatchTest()     {         List<A> objArray = new List<A>();         objArray.Add(new A('1','one'));         objArray.Add(new A('2', 'two'));          string findStr = '3';         string foundVal;         // Find using an anonymous delegate:         foundVal = objArray.Find(delegate(A a) // <- System.NullReferenceException: Object reference not set to an instance of an object..         {             if (a.name == findStr)                 return true;             else return false;         }).value;     }   } }

I don’t understand why I’m getting a NullReferenceException instead of the Find just not finding the item and returning null. I’m 90% sure it’s some subtle coding error on my part that I just haven’t seen, but this has been bugging me all day, please help!

EDIT: I should mention I inherited this convoluted code form someone else, so the twisty code you see above is a somewhat simplified version of whats failing in my real code.

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1 Answer

  1. Find is returning null. But then you are dereferencing that result. That is, you’re invoking:

    Find(...).value

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