C# int 与 string的相互转型

代码:

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 1 class Program
 2     {
 3         static void Main()
 4         {
 5             int a = 123;
 6             string s1 = a.ToString();
 7             string s2 = Convert.ToString(a);
 8             string s3 = ((IConvertible)a).ToString(null);
 9             
10             string s = "456";
11             int a1 = int.Parse(s);
12             int a2 = Convert.ToInt32(s);
13             int a3 = ((IConvertible)s).ToInt32(null);
14             int a4;
15             int.TryParse(s,out a4);
16         }
17     }