C# 字符串包含()

public bool Contains(String str)

using System;  
    public class StringExample  
    {  
        public static void Main(string[] args)  
        {  
             string s1 = "Hello ";  
             string s2 = "He";
          	 string s3 = "Hi";
             Console.WriteLine(s1.Contains(s2));
             Console.WriteLine(s1.Contains(s3));
             
        }  
    }  

 true
False