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AspnetUpload2.0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。ChrisHynes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
HttpApplicationapplication1=senderasHttpApplication;
HttpWorkerRequestrequest1=(HttpWorkerRequest)((IServiceProvider)HttpContext.Current).GetService(typeof(HttpWorkerRequest));
try
{
if(application1.Context.Request.ContentType.IndexOf("multipart/form-data")<=-1)
{
return;
}
//CheckTheHasEntityBody
if(!request1.HasEntityBody())
{
return;
}
intnum1=0;
TimeSpanspan1=DateTime.Now.Subtract(this.beginTime);
stringtext1=application1.Context.Request.ContentType.ToLower();
byte[]buffer1=Encoding.ASCII.GetBytes(("rn--"+text1.Substring(text1.IndexOf("boundary=")+9)).ToCharArray());
intnum2=Convert.ToInt32(request1.GetKnownRequestHeader(11));
Progressprogress1=newProgress();
application1.Context.Items.Add("FileList",newHashtable());
byte[]buffer2=request1.GetPreloadedEntityBody();
num1+=buffer2.Length;
stringtext2=this.AnalysePreloadedEntityBody(buffer2,"UploadGUID");
if(text2!=string.Empty)
{
application1.Context.Items.Add("LionSky_UpLoadModule_UploadGUID",text2);
}
boolflag1=true;
if((num2>this.UpLoadFileLength())&&((0>span1.TotalHours)||(span1.TotalHours>3)))
{
flag1=false;
}
if((0>span1.TotalHours)||(span1.TotalHours>3))
{
flag1=false;
}
stringtext3=this.AnalysePreloadedEntityBody(buffer2,"UploadFolder");
ArrayListlist1=newArrayList();
RequestStreamstream1=newRequestStream(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;
ArrayListlist2;
intnum3=204800;
byte[]buffer3=newbyte[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=newbyte[list2.Count+buffer3.Length];
list2.CopyTo(buffer4,0);
buffer3.CopyTo(buffer4,list2.Count);
stream1=newRequestStream(buffer4,buffer1,stream1.FileStream,stream1.FStatus,stream1.RStatus,text3,flag1,application1.Context,stream1.OriginalFileName);
}
else
{
stream1=newRequestStream(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=newbyte[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=newbyte[list2.Count+buffer3.Length];
list2.CopyTo(buffer4,0);
buffer3.CopyTo(buffer4,list2.Count);
stream1=newRequestStream(buffer4,buffer1,stream1.FileStream,stream1.FStatus,stream1.RStatus,text3,flag1,application1.Context,stream1.OriginalFileName);
}
else
{
stream1=newRequestStream(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=newbyte[list1.Count];
list1.CopyTo(buffer5);
this.PopulateRequestData(request1,buffer5);
}
catch(Exceptionexception1)
{
this.ClearApplication(application1);
throwexception1;
}
而思归所说的方法使用Mime也能上传大文件，在以下地址下载
http://krystalware.com/files/slickupload.zip
不过觉得的思归的方法容易很多
相关文章：
让asp.net默认的上传组件支持进度条反映
http://blog.joycode.com/dotey/archive/2005/06/12/53557.aspx//宝玉
http://blog.joycode.com/saucer/archive/2004/03/16/16225.aspx//思归
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
通过WebServices上传和下载文件
http://dotnet.aspx.cc/ShowDetail.aspx?id=6381BD5F-51F3-4339-4239-1328564A1B2A
上传组件是如何不受settimeout限制的？
http://www.ietf.org/rfc/rfc1867.txt?number=1867
下载
http://support.microsoft.com/default.aspx?scid=kb;en-us;812406&Product=aspnet
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