ASP.NET 应用中大文件上传研究

时间:2008-10-07 12:08:04  来源:第二电脑网上收集  作者:

  第二电脑网导读:Body 和 ReadEntityBody方法从IIS为ASP.NET建立的pipe里分块读取数据。Chris Hynes为我们提供了这样的一个方案(用HttpModule),该方案除了允许你上传大文件外,还能实时显示上传进度。  Lion.Web.UpLoadModule和AspnetUpload 两个.NET组件都是利用的这个方案。  当上传单文件时,两个软件的方法是一样的,继承HttpModule
  正文: 在项目中经常要用到了大文件上传,要上传的文件有100多m,于是研究现在国内使用的大文件上传的组件发现用的比较多的有两个控件ASP/ target=_blank class=infotextkey>aspnetUpload 2.0和Lion.Web.UpLoadModule,两个控件的方法是:利用隐含的HttpWorkerRequest,用它的GetPreloadedEntityBody 和 ReadEntityBody方法从IIS为ASP.NET建立的pipe里分块读取数据。Chris Hynes为我们提供了这样的一个方案(用HttpModule),该方案除了允许你上传大文件外,还能实时显示上传进度。

  Lion.Web.UpLoadModule和AspnetUpload 两个.NET组件都是利用的这个方案。

  当上传单文件时,两个软件的方法是一样的,继承HttpModule

HttpApplication application1 = sender as HttpApplication;
HttpWorkerRequest request1 = (HttpWorkerRequest) ((IServiceProvider) HttpContext.Current).GetService(typeof(HttpWorkerRequest));
try
{
 if (application1.Context.Request.ContentType.IndexOf("multipart/form-data") <= -1)
 {
  return;
 }
 //Check The HasEntityBody
 if (!request1.HasEntityBody())
 {
  return;
 }
 int num1 = 0;
 TimeSpan span1 = DateTime.Now.Subtract(this.beginTime);

 string text1 = application1.Context.Request.ContentType.ToLower();

 byte[] buffer1 = Encoding.ASCII.GetBytes(("/r/n--" + text1.Substring(text1.IndexOf("boundary=") + 9)).ToCharArray());
 int num2 = Convert.ToInt32(request1.GetKnownRequestHeader(11));
 Progress progress1 = new Progress();

 application1.Context.Items.Add("FileList", new Hashtable());

 byte[] buffer2 = request1.GetPreloadedEntityBody();
 num1 += buffer2.Length;

 string text2 = this.AnalysePreloadedEntityBody(buffer2, "UploadGUID");
 if (text2 != string.Empty)
 {
  application1.Context.Items.Add("LionSky_UpLoadModule_UploadGUID", text2);
 }
 bool flag1 = true;
 if ((num2 > this.UpLoadFileLength()) && ((0 > span1.TotalHours) || (span1.TotalHours > 3)))
 {
  flag1 = false;
 }
 if ((0 > span1.TotalHours) || (span1.TotalHours > 3))
 {
  flag1 = false;
 }
 string text3 = this.AnalysePreloadedEntityBody(buffer2, "UploadFolder");
 ArrayList list1 = new ArrayList();
 RequestStream stream1 = new RequestStream(buffer2, buffer1, null, RequestStream.FileStatus.Close, RequestStream.ReadStatus.NoRead, text3, flag1, application1.Context, string.Empty);
 list1.AddRange(stream1.ReadBody);
 if (text2 != string.Empty)
 {
  progress1.FileLength = num2;
  progress1.ReceivedLength = num1;
  progress1.FileName = stream1.OriginalFileName;
  progress1.FileCount = ((Hashtable) application1.Context.Items["FileList"]).Count;
  application1.Application["_UploadGUID_" + text2] = progress1;
 }
 if (!request1.IsEntireEntityBodyIsPreloaded())
 {
  byte[] buffer4;
  ArrayList list2;
  int num3 = 204800;
  byte[] buffer3 = new byte[num3];
  while ((num2 - num1) >= num3)
  {
   if (!application1.Context.Response.IsClientConnected)
   {
    this.ClearApplication(application1);
   }
   num3 = request1.ReadEntityBody(buffer3, buffer3.Length);
   num1 += num3;
   list2 = stream1.ContentBody;
   if (list2.Count > 0)
   {
    buffer4 = new byte[list2.Count + buffer3.Length];
    list2.CopyTo(buffer4, 0);
    buffer3.CopyTo(buffer4, list2.Count);
    stream1 = new RequestStream(buffer4, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
   }
   else
   {
    stream1 = new RequestStream(buffer3, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
   }
   list1.AddRange(stream1.ReadBody);
   if (text2 != string.Empty)
   {
    progress1.ReceivedLength = num1;
    progress1.FileName = stream1.OriginalFileName;
    progress1.FileCount = ((Hashtable) application1.Context.Items["FileList"]).Count;
    application1.Application["_UploadGUID_" + text2] = progress1;
   }
  }
  buffer3 = new byte[num2 - num1];
  if (!application1.Context.Response.IsClientConnected && (stream1.FStatus ==  RequestStream.FileStatus.Open))
  {
   this.ClearApplication(application1);
  }
  num3 = request1.ReadEntityBody(buffer3, buffer3.Length);
  list2 = stream1.ContentBody;
  if (list2.Count > 0)
  {
   buffer4 = new byte[list2.Count + buffer3.Length];
   list2.CopyTo(buffer4, 0);
   buffer3.CopyTo(buffer4, list2.Count);
   stream1 = new RequestStream(buffer4, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
  }
  else
  {
   stream1 = new RequestStream(buffer3, buffer1, stream1.FileStream, stream1.FStatus, stream1.RStatus, text3, flag1, application1.Context, stream1.OriginalFileName);
  }
  list1.AddRange(stream1.ReadBody);
  if (text2 != string.Empty)
  {
   progress1.ReceivedLength = num1 + buffer3.Length;
   progress1.FileName = stream1.OriginalFileName;
   progress1.FileCount = ((Hashtable) application1.Context.Items["FileList"]).Count;
   if (flag1)
   {
    progress1.UploadStatus = Progress.UploadStatusEnum.Uploaded;
   }
   else
   {
    application1.Application.Remove("_UploadGUID_" + text2);
   }
  }
 }
 byte[] buffer5 = new byte[list1.Count];
 list1.CopyTo(buffer5);
 this.PopulateRequestData(request1, buffer5);
}
catch (Exception exception1)
{
 this.ClearApplication(application1);
 throw exception1;
}
ASP.NET 应用中大文件上传研究》由第二电脑网原创提供,转载请注明:http://www.002pc.com/master/College/Programming/ASP/2008-10-07/3073.html


关键字:

关于《ASP.NET 应用中大文件上传研究》文章的评论

站内搜索: 高级搜索

热门搜索: Windows style 系统 tr IP QQ CPU 安装 function 注册 if td