asp.net 上传大文件解决方案

转载

mob604756e834f7 2007-05-18 15:50:00

这次在项目中，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AspnetUpload 2.0和Lion.Web.UpLoadModule，另外还有思归在它的博客

堂中所说的办法 http://blog.joycode.com/saucer/archive/2004/03/16/16225.aspx

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