为什么C#List <T> .Find似乎返回NullReferenceException？

首先,根据http://msdn.microsoft.com/en-us/library/x0b5b5bc.aspx,List.Find方法仅列为抛出ArgumentNullException.但是,我有以下测试代码,当使用Find与匿名委托时,在找不到要搜索的对象时抛出NullReferenceException.

namespace MyTestNS
{
  class MyTestClass
  {
    [TestMethod()]
    public void ArrayMatchTest()
    {
        List objArray = new List();
        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;
    }
  }
}