学步园

public class UpLoadHttpModule : IHttpModule
{
    // Methods
    private void Application_BeginRequest(object sender, EventArgs e)
    {
        HttpRequest request = HttpContext.Current.Request;
        if (request.ContentLength > 0x400000)
        {
            HttpApplication app = sender as HttpApplication;
            HttpContext context = app.Context;
            try
            {
                HttpWorkerRequest wr = (HttpWorkerRequest) context.GetType().GetProperty("WorkerRequest", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(context, null);
                if (wr.HasEntityBody())
                {
                    int contentlen = Convert.ToInt32(wr.GetKnownRequestHeader(11));
                    byte[] buffer = wr.GetPreloadedEntityBody();
                    int received = 0;
                    if (buffer != null)
                    {
                        received = buffer.Length;
                    }
                    int totalrecv = received;
                    if (!wr.IsEntireEntityBodyIsPreloaded())
                    {
                        buffer = new byte[0xffff];
                        while ((contentlen - totalrecv) >= received)
                        {
                            received = wr.ReadEntityBody(buffer, buffer.Length);
                            totalrecv += received;
                        }
                        received = wr.ReadEntityBody(buffer, contentlen - totalrecv);
                    }
                }
                context.Response.Redirect("error.aspx" + request.Url.Query + "");
            }
            catch (Exception)
            {
                context.Response.Redirect("error.aspx" + request.Url.Query + "");
            }
        }
    }

    private void application_EndRequest(object sender, EventArgs e)
    {
    }
    public void Dispose()
    {
    }
    public void Init(HttpApplication application)
    {
        application.BeginRequest += new EventHandler(this.Application_BeginRequest);
        application.EndRequest += new EventHandler(this.application_EndRequest);
    }
}