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static void Main(string[] args)
{
List<TestClass> list = new List<TestClass>();
list.Add(new TestClass(1));
list.Add(new TestClass(2));
list.Add(new TestClass(3));
list.Add(new TestClass(4));
var test = list.SingleOrDefault(x=>x.a == 3);
Console.WriteLine("test的Hash码:{0}", test.GetHashCode());
Console.WriteLine("list[2]的Hash码:{0}", list[2].GetHashCode());
test = new TestClass(1024);
Console.WriteLine("test的Hash码:{0}", test.GetHashCode());
Console.WriteLine("list[2]的Hash码:{0}", list[2].GetHashCode());
}