值类型与引用类型的简单测试，没有太多的理论，一目了然。

 1     [TestClass]
 2     public class HomeControllerTest
 3     {
 4         [TestMethod]
 5         public void ZhiTest()
 6         {
 7             int a = 10;
 8             Zhi(a);
 9             Assert.AreEqual(11, a);
10         }
11         public void Zhi(int a)
12         {
13             a++;
14         }
15 
16         [TestMethod]
17         public void YinyongTest()
18         {
19             List<int> list = new List<int>();
20             Yinyong(list);
21             Assert.AreEqual(1, list[0]);
22         }
23         public void Yinyong(List<int> list)
24         {
25             list.Add(1);
26         }
27 
28     }