C# FileStream 文件流

文件读写

  using(FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
              byte[] buffer=new byte[1024*100];
              //FileMode.Append 如果文件已存在将在结尾处添加 如果不存在将创建
              //using (FileStream fsWrite = new FileStream(paths, FileMode.Append, FileAccess.Write))
               //FileMode.Append 如果文件重名则覆盖  
              using (FileStream fsWrite = new FileStream(paths, FileMode.OpenOrCreate, FileAccess.Write))
               {
                   while (true)
                   {
                       int r = file.Read(buffer, 0, buffer.Length);
                       if (r == 0)
                       {
                           break;
                       }
                      fsWrite.Write(buffer, 0, r );
                    }
               }
            }