C#自适应合并文件的方法

using System;using System.IO;namespace MergeFile{  class Program  {    public static void Main(string[] args)    {      int count=1;      string sourcepath=@"D:/SplitFile";      string filetomerge=@"C:/编程的奥秘.pdf";      FileStream ftm = new FileStream(filetomerge, FileMode.Create, FileAccess.Write);      BinaryWriter bw=new BinaryWriter(ftm);      string filepath;      while(File.Exists(filepath=sourcepath+Path.DirectorySeparatorChar+Path.GetFileName(filetomerge)+count++))      {        FileStream fsr = new FileStream(filepath, FileMode.Open, FileAccess.Read);        BinaryReader br=new BinaryReader(fsr);        bw.Write(br.ReadBytes((int)fsr.Length));        br.Close();        fsr.Close();      }      bw.Flush();      bw.Close();      ftm.Close();    }  }}