這段時(shí)間因項(xiàng)目需要，要實(shí)現(xiàn)WinForm下的文件上傳，個(gè)人覺得采用FTP方法太麻煩，還得配置FTP服務(wù)器，要通過防火墻也是一個(gè)麻煩。本來(lái)打算采用WebClient方法，但是采用這個(gè)方法實(shí)現(xiàn)后，進(jìn)度條很短時(shí)間后就達(dá)到最大值，要等待一段時(shí)間才能傳送完畢，要是文件太大（我這里測(cè)試約100M），會(huì)出現(xiàn)錯(cuò)誤。后來(lái)才知道，原來(lái)WebClient是在加載完整個(gè)文件到內(nèi)存后才真正開始上傳，怪不得會(huì)出現(xiàn)前面的問題了。不得已參考了很多文章，老外的一個(gè)文章對(duì)我啟發(fā)很大（http://blogs.msdn.com/johan/archive/2006/11/15/are-you-getting-outofmemoryexceptions-when-uploading-large-files.aspx），是采用HttpWebRequest方法實(shí)現(xiàn)的。廢話少說，開始進(jìn)入正題。實(shí)現(xiàn)過程如下：
在WinForm里面調(diào)用下面的方法來(lái)上傳文件：
-
-
-
-
-
-
-
- private int Upload_Request(string address, string fileNamePath, string saveName, ProgressBar progressBar)
- {
- int returnValue = 0;
-
- FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
- BinaryReader r = new BinaryReader(fs);
-
- string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
- byte[] boundaryBytes = Encoding.ASCII.GetBytes("/r/n--" + strBoundary + "/r/n");
-
- StringBuilder sb = new StringBuilder();
- sb.Append("--");
- sb.Append(strBoundary);
- sb.Append("/r/n");
- sb.Append("Content-Disposition: form-data; name=/"");
- sb.Append("file");
- sb.Append("/"; filename=/"");
- sb.Append(saveName);
- sb.Append("/"");
- sb.Append("/r/n");
- sb.Append("Content-Type: ");
- sb.Append("application/octet-stream");
- sb.Append("/r/n");
- sb.Append("/r/n");
- string strPostHeader = sb.ToString();
- byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);
-
- HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));
- httpReq.Method = "POST";
-
- httpReq.AllowWriteStreamBuffering = false;
-
- httpReq.Timeout = 300000;
- httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
- long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
- long fileLength = fs.Length;
- httpReq.ContentLength = length;
- try
- {
- progressBar.Maximum = int.MaxValue;
- progressBar.Minimum = 0;
- progressBar.Value = 0;
-
- int bufferLength = 4096;
- byte[] buffer = new byte[bufferLength];
-
- long offset = 0;
-
- DateTime startTime = DateTime.Now;
- int size = r.Read(buffer, 0, bufferLength);
- Stream postStream = httpReq.GetRequestStream();
-
- postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
- while (size > 0)
- {
- postStream.Write(buffer, 0, size);
- offset += size;
- progressBar.Value = (int)(offset * (int.MaxValue / length));
- TimeSpan span = DateTime.Now - startTime;
- double second = span.TotalSeconds;
- lblTime.Text = "已用時(shí)：" + second.ToString("F2") + "秒";
- if (second > 0.001)
- {
- lblSpeed.Text = " 平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";
- }
- else
- {
- lblSpeed.Text = " 正在連接…";
- }
- lblState.Text = "已上傳：" + (offset * 100.0 / length).ToString("F2") + "%";
- lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";
- Application.DoEvents();
- size = r.Read(buffer, 0, bufferLength);
- }
-
- postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
- postStream.Close();
-
- WebResponse webRespon = httpReq.GetResponse();
- Stream s = webRespon.GetResponseStream();
- StreamReader sr = new StreamReader(s);
-
- String sReturnString = sr.ReadLine();
- s.Close();
- sr.Close();
- if (sReturnString == "Success")
- {
- returnValue = 1;
- }
- else if (sReturnString == "Error")
- {
- returnValue = 0;
- }
- }
- catch
- {
- returnValue = 0;
- }
- finally
- {
- fs.Close();
- r.Close();
- }
- return returnValue;
- }
參數(shù)說明如下：
address：接收文件的URL地址，如：http://localhost/UploadFile/Save.aspx
fileNamePath：要上傳的本地文件，如：D:/test.rar
saveName：文件上傳到服務(wù)器后的名稱，如：200901011234.rar
progressBar：顯示文件上傳進(jìn)度的進(jìn)度條。
接收文件的WebForm添加一個(gè)Save.aspx頁(yè)面，Load方法如下：
- protected void Page_Load(object sender, EventArgs e)
- {
- if (Request.Files.Count > 0)
- {
- try
- {
- HttpPostedFile file = Request.Files[0];
- string filePath = this.MapPath("UploadDocument") + "http://" + file.FileName;
- file.SaveAs(filePath);
- Response.Write("Success/r/n");
- }
- catch
- {
- Response.Write("Error/r/n");
- }
- }
同時(shí)需要配置WebConfig文件的httpRuntime 如下：
<httpRuntime maxRequestLength="102400" executionTimeout="300"/>
不能的話最大只能上傳4M了。要是想上傳更大的文件，maxRequestLength，executionTimeout設(shè)置大些，同時(shí)WinForm下的代碼行
//設(shè)置獲得響應(yīng)的超時(shí)時(shí)間（300秒）
httpReq.Timeout = 300000;
也要修改，另外別忘了看看IIS的連接超時(shí)是否設(shè)置為足夠大。
一切都配置好了，運(yùn)行效果如下：
運(yùn)行效果.jpg)
為了解決這個(gè)問題，我查看了很多文章，記于此，以后遇到同樣的問題有個(gè)查找的地方。
400 186 1886
