Beautiful Mizuki!

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using System;
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using System.IO;
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namespace extension_change
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{
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    internal class Program
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    {
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        static void Main(string[] args)
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        {
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            if (args.GetLength(0) > 0)
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            {
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                Console.WriteLine("请输入要修改的后缀名,不需要输入.");
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                string extension = Console.ReadLine();
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                string[] files = args;
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                foreach (string file in files)
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                {
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                    if(extension != "")
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                    {
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                        if (File.Exists(file))
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                        {
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                            Console.WriteLine("正在修改" + file + "的后缀名为" + extension);
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                            string fileName = Path.GetFileNameWithoutExtension(file);
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                            string filePath = Path.GetDirectoryName(file);
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                            string newFileName = fileName + "." + extension;
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                            string newFilePath = filePath + "\\" + newFileName;
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                            File.Move(file, newFilePath);
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                            Console.WriteLine();
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                        }
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                        else
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                        {
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                            Console.WriteLine("文件不存在");
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                        }
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                    }
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                    else
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                    {
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                        Console.WriteLine("没有输入后缀名");
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                    }
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                }
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                Console.WriteLine("修改完成");
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            }
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            else
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            {
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                Console.WriteLine("没有输入文件路径");
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            }
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            Console.ReadKey();
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        }
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    }
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}