asp.net中上传大文件

直接在ASP.net中上传大文件的方法．
方法一：在web.config中添加<httpRuntime maxRequestLength="100000" executionTimeout="45"/>
方法二：修改ＩＩＳ配置文件windows->system32->inetsrv->metaBase.XML
方法三：
1．   httpHandler or HttpModule
a.在ASP.net进程处理request请求之前截获request对象
b.分块读取和写入数据
c.实时跟踪上传进度更新meta信息
2．   利用隐含的HttpWorkerRequest用它的GetPreloadedEntityBody 和 ReadEntityBody方法处理文件流
上传代码
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 &g