C#文件断点续传实现方法

/// <summary>/// 下载局域网文件/// </summary>/// <param name="path">文件路径，如：//192.168.10.1/app/app/123.zip</param>/// <param name="username">计算机名称</param>/// <param name="password">计算机密码</param>static void RequestWindowsShared(string path, string username, string password){ //文件总大小 int allBytesCount = 0; //每次传输大小 int byteTemp = 1024; //当前位置 int bytePosition = 0; //剩下大小 int remain = 0; System.Net.FileWebRequest request = null; System.Net.FileWebResponse response = null; System.IO.Stream stream = null; System.IO.FileStream fileStream = null; try {  Uri uri = new Uri(path);  request = (System.Net.FileWebRequest)System.Net.FileWebRequest.Create(uri);  System.Net.ICredentials ic = new System.Net.NetworkCredential(username, password);  request.Credentials = ic;  response = (System.Net.FileWebResponse)request.GetResponse();  stream = response.GetResponseStream();  byte[] bytes = new byte[stream.Length];  stream.Read(bytes, 0, bytes.Length);  string filename = System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "//" + System.IO.Path.GetFileName(path);  fileStream = new FileStream(filename, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.ReadWrite);  allBytesCount = bytes.Length;  remain = allBytesCount;  while (remain > 0)  {   fileStream.Write(bytes, bytePosition, byteTemp);   remain = remain - byteTemp;   bytePosition = bytePosition + byteTemp;   fileStream.Flush();   if (remain < byteTemp)    byteTemp = remain;  }  Console.WriteLine("下载成功!"); } catch (Exception ex) {  Console.WriteLine(ex.Message); } finally {  fileStream.Close();  fileStream.Dispose();  stream.Close();  stream.Dispose(); }}/// <summary>/// 上传文件/// </summary>/// <param name="path">共享目录路径+文件名称</param>/// <param name="local">本地路径</param>/// <param name="username">用户名</param>/// <param name="password">密码</param>static void ResponseWindowsShared(string path, string local, string username, string password){ //文件总大小 int allBytesCount = 0; //每次传输大小 int byteTemp = 1024; //当前位置 int bytePosition = 0; //剩下大小 int remain = 0; System.Net.FileWebRequest request = null; System.IO.Stream stream = null; try {  //时间戳   string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");  Uri uri = new Uri(path);  byte[] bytes = System.IO.File.ReadAllBytes(local);  request = (System.Net.FileWebRequest)System.Net.FileWebRequest.Create(uri);  request.Method = "POST";  //设置获得响应的超时时间（300秒）   request.Timeout = 300000;  request.ContentType = "multipart/form-data; boundary=" + strBoundary;  request.ContentLength = bytes.Length;  System.Net.ICredentials ic = new System.Net.NetworkCredential(username, password);  request.Credentials = ic;  stream = request.GetRequestStream();  allBytesCount = bytes.Length;  remain = allBytesCount;  while (remain > 0)  {   stream.Write(bytes, bytePosition, byteTemp);   remain = remain - byteTemp;   bytePosition = bytePosition + byteTemp;   stream.Flush();   if (remain < byteTemp)    byteTemp = remain;  }  Console.WriteLine("上传成功!"); } catch (Exception ex) {  Console.WriteLine(ex.Message); } finally {  stream.Close();  stream.Dispose(); }}