這次在項目中，用到了大文件上傳，要上傳的文件有100多m，於是研究現在國內使用的大文件上傳的
組件發現用的比較多的有兩個控件AspnetUpload 2.0和Lion.Web.UpLoadModule，另外還有思歸在它的博客
堂中所說的辦法 http://blog.joycode.com/saucer/archive/2004/03/16/16225.aspx
兩個控件的方法是：利用隱含的HttpWorkerRequest，用它的GetPreloadedEntityBody 和 ReadEntityBody方法從IIS為ASP.NET建立的pipe裡分塊讀取數據。Chris Hynes為我們提供了這樣的一個方案(用HttpModule)，該方案除了允許你上傳大文件外，還能實時顯示上傳進度。
Lion.Web.UpLoadModule和AspnetUpload 兩個.NET組件都是利用的這個方案。
當上傳單文件時，兩個軟件的方法是一樣的，繼承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;
}
而思歸所說的方法使用Mime也能上傳大文件，在以下地址下載
http://krystalware.com/files/slickupload.zip
不過覺得的思歸的方法容易很多
相關文章：
讓asp.net默認的上傳組件支持進度條反映
http://blog.joycode.com/dotey/archive/2005/06/12/53557.aspx // 寶玉
http://blog.joycode.com/saucer/archive/2004/03/16/16225.aspx // 思歸
http://www.cnblogs.com/bestcomy/archive/2004/06/09/14267.aspx // bestcomy
http://krystalware.com/wiki/default.aspx/KrystalWiki.UploadSpike1
http://www.blueidea.com/tech/program/2005/2997.asp //ftp
通過Web Services上傳和下載文件
http://dotnet.aspx.cc/ShowDetail.aspx?id=6381BD5F-51F3-4339-4239-1328564A1B2A
上傳組件是如何不受settimeout限制的？
http://www.ietf.org/rfc/rfc1867.txt?number=1867
下載
http://support.microsoft.com/default.aspx?scid=kb;en-us;812406&Product=aspnet
