YTU OJ 3444 C# 问题 C: C#提取文件名

using System;

namespace text1
{
    
    
    class Program
    {
    
    
        static void Main(string[] args)
        {
    
    
            Location(Console.ReadLine());
        }
        public static string Location(string str)
        {
    
    
            int Position;
            int Position1;
            Position = str.LastIndexOf('\\');
            Position1 = str.LastIndexOf('.') - Position;
            Console.WriteLine(str.Substring(Position + 1, Position1 + 3));
            return str;
        }
    }
}

LastIndexOf方法

Substring方法