帮忙把这个ftp类上传方法改成异步的。

悬赏园豆：30 [已解决问题] 解决于 2009-02-20 13:10

<pre></pre> <div> <div class="cnblogs_code"> <pre>using System; using System.IO; using System.Net; using System.Net.Security; using System.Collections; using System.Collections.Generic; using System.Security.Cryptography.X509Certificates; using System.Threading; namespace WinApp_IR { public sealed class FtpClientService { #region Internal Members private NetworkCredential certificate; #endregion /// <summary> /// 构造函数，提供初始化数据的功能，打开Ftp站点 /// </summary> public FtpClientService(string User, string Pwd) { certificate = new NetworkCredential( User, Pwd ); } /// <summary> /// 创建FTP请求 /// </summary> /// <param name="uri">ftp://myserver/upload.txt</param> /// <param name="method">Upload/Download</param> /// <returns></returns> private FtpWebRequest CreateFtpWebRequest(Uri uri, string method, int outTime) { FtpWebRequest ftpClientRequest = (FtpWebRequest)WebRequest.Create( uri ); ftpClientRequest.Proxy = null; ftpClientRequest.Credentials = certificate; ftpClientRequest.KeepAlive = true; ftpClientRequest.UseBinary = true; ftpClientRequest.UsePassive = false; ftpClientRequest.Method = method; ftpClientRequest.Timeout = outTime; ftpClientRequest.EnableSsl = true; return ftpClientRequest; } #region 支持断点续传 public bool IsLogin(Uri destinationPath, string ftpMethod, int timeOut) { try { Uri uri = new Uri( destinationPath.AbsoluteUri + "/Test.Gif" ); FtpWebRequest request = CreateFtpWebRequest( uri, ftpMethod, timeOut ); ///////////////这个地方 WebResponse response = request.GetResponse(); //WebResponse response = request.BeginGetResponse( new AsyncCallback( CopyDataToDestination ), request ); request = CreateFtpWebRequest( uri, WebRequestMethods.Ftp.DeleteFile, timeOut ); ///////////////这个地方 response = request.GetResponse(); //response = request.BeginGetResponse( new AsyncCallback( CopyDataToDestination ), request ); response.Close(); } catch (Exception ex) { ex.ToString(); return false; } return true; } public bool UploadFile(string sourceFile, Uri destinationPath, int offSet, string ftpMethod, int timeOut) { try { FileInfo file = new FileInfo( sourceFile ); Uri uri = new Uri( destinationPath.AbsoluteUri + "/" + file.Name ); FtpWebRequest request = CreateFtpWebRequest( uri, ftpMethod, timeOut ); request.ContentOffset = offSet; ///////////////这个地方 Stream requestStream = request.GetRequestStream();//需要获取文件的流 //Stream requestStream = request.BeginGetRequestStream( new AsyncCallback( CopyDataToDestination ), request ); FileStream fileStream = new FileStream( sourceFile, FileMode.Open, FileAccess.Read );//创建存储文件的流 int sourceLength = (int)fileStream.Length; offSet = CopyDataToDestination( fileStream, requestStream, offSet ); ///////////////这个地方 WebResponse response = request.GetResponse(); //WebResponse response = request.BeginGetResponse( new AsyncCallback( CopyDataToDestination ), request ); response.Close(); if (offSet != 0) { UploadFile( sourceFile, destinationPath, offSet, WebRequestMethods.Ftp.AppendFile, timeOut ); } } catch (Exception ex) { ex.ToString(); return false; } return true; } private int CopyDataToDestination(Stream sourceStream, Stream destinationStream, int offSet) { try { int sourceLength = (int)sourceStream.Length; int length = sourceLength - offSet; byte[] buffer = new byte[length + offSet]; int bytesRead = sourceStream.Read( buffer, offSet, length ); while (bytesRead != 0) { destinationStream.Write( buffer, 0, bytesRead ); bytesRead = sourceStream.Read( buffer, 0, length ); length = length - bytesRead; offSet = (bytesRead == 0) ? 0 : (sourceLength - length);//(length - bytesRead); } } catch (Exception ex) { string error = ex.ToString(); return offSet; } finally { destinationStream.Close(); destinationStream.Dispose(); sourceStream.Close(); sourceStream.Dispose(); } return offSet; } #endregion } }</pre> </div> <pre></pre> </div>

.NET技术 C#

KHK | 初学一级 | 园豆：170
提问于：2008-10-16 16:25

< >

最佳答案

在.Net FrameWork的一些类中，只要有以Begin..../End....开头的方法说明该类的这些方法支持异步操作。

给你一个例子参考一下。不难的。

Code
class HttpAsynGet   
    {   
        public HttpAsynGet(string url)   
        {   
            this.Url = url;   
            request = (HttpWebRequest)WebRequest.Create(Url);   
        }   
        public string Url   
        {   
            get;   
            set;   
        }   
        private HttpWebRequest request;   
        public HttpWebRequest Request   
        {   
            get  
            {   
                return request;   
            }   
        }   
        public void DO()   
        {   
            request.BeginGetResponse(ProcessResponse, this);   
        }   
        private void ProcessResponse(IAsyncResult ar)   
        {   
            HttpAsynGet item = (HttpAsynGet)ar.AsyncState;   
            using (HttpWebResponse response = (HttpWebResponse)item.request.EndGetResponse(ar))   
            {   
                if (response.StatusCode == HttpStatusCode.OK)   
                {   
                    Console.WriteLine(response.ContentLength);   
                    Console.WriteLine(new string('=', 20));   
                }   
                else  
                {   
                    Console.WriteLine(response.StatusDescription);   
                }   
                this.request.Abort();   
            }   
        }   
    }

RicoRui | 老鸟四级 |园豆：3663 | 2008-10-16 16:47

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帮忙把这个ftp类上传方法改成异步的。

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