Examine WebResponse Without Affecting The Underlying Response Stream In .NET?
Oct 27, 2010
After a call to initial HttpWebResponse.GetResponseStream() and reading through the stream, that stream is done for and cannot be reused.
I have a situation where I need to examine the content of the response and if it is of a certain data, get another page and then pass the new response down the line. Otherwise, pass down the original response as is. The only problem is that after examining the response to check for this "special data", that response is no good to the downstream code.
The only way, I can think of, to make this transparent to the downstream code, is to create a derived class of HttpWebResponse, and somehow cache the data streamed, and pass that cached stream down the line instead of the initial stream. I'm not sure if that's even feasible since I haven't looked into it further.
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Feb 22, 2011
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Aug 29, 2010
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Text;
using System.Data;
using System.Drawing;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
System.Web.UI.WebControls.Panel panelmain = new System.Web.UI.WebControls.Panel();
System.Web.UI.WebControls.Literal abc = new System.Web.UI.WebControls.Literal();
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DataTable dt;
DataRow dr;
DataColumn idCoulumn;
DataColumn nameCoulumn;
dt = new DataTable();
idCoulumn = new DataColumn("ID", Type.GetType("System.Int32"));
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dt.Columns.Add(idCoulumn);
dt.Columns.Add(nameCoulumn);
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dr["ID"] = 1;
dr["Name"] = "Name1";
dt.Rows.Add(dr);
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dr["ID"] = 2;.............
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Jan 9, 2010
MemoryStream export = new MemoryStream();
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public class CalendarHandler : IHttpHandler
{
private Calendar service;
private Membership membershipS;
public void ProcessRequest(HttpContext context)
{
service = new Calendar ();
membershipS = new Membership (null);
string userName = context.User.Identity.Name;
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public bool IsReusable
{
get
{
return false;
}
}
}
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$('#ExportCalendar').click(function(e)
{
$.post('../Models/CalendarHandler.ashx', null, function(r)
{
});
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});
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Dec 6, 2010
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Request.Files[0].InputStream,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.OnLoad);
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This is the exception stack trace:
System.IO.IOException: Cannot read from the stream. --->
System.Runtime.InteropServices.COMException (0x88982F72):
Exception from HRESULT: 0x88982F72 [code]...
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Sep 20, 2010
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<div class="content">
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Sep 21, 2010
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Jan 27, 2011
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[Code]....
And in my controller:
[Code]....
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using (var fs3 = new FileStream(filePath2, FileMode.Open, FileAccess.Read))
{
byte[] b2 = ReadFully(fs3, 1024);
}
// [URL]
public static byte[] ReadFully(Stream stream, int initialLength)
{
// If we've been passed an unhelpful initial length, just
// use 32K.
if (initialLength < 1)
{
initialLength = 32768;
}
byte[] buffer = new byte[initialLength];
int read = 0;
int chunk;
while ((chunk = stream.Read(buffer, read, buffer.Length - read)) > 0)
{
read += chunk;
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if (read == buffer.Length)
{
int nextByte = stream.ReadByte();
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Jan 20, 2011
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Oct 11, 2010
I am generating an Excel file upon a click of a button in an update panel. It is throwing a parsing error.
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Response.AddHeader("Content-Disposition",
String.Format("attachment;filename={0}", filename))
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I need to to export a file to the user. It takes 1-2 min to generate the file so I'd like to have the page go into a kind-of modal mode with a layover on the page and a 'Working' spinner showing. The problem is I can't make the modal stuff go away after Save File dialog is closed.
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Sep 6, 2010
I'd like to get both C# and VB.NET sugestion.
I have an ASP.NET FileUpload control, which allows only image type. I used RegularExpressionValidator like below.
<asp:FileUpload ID="fuPhoto" runat="server" TabIndex="40" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator3"
runat="server" ControlToValidate="fuPhoto" Display="Dynamic"
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How do I examine the file content being uploaded?
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May 18, 2010
I have built a simple threadpool based web crawler within my web application. Its job is to crawl its own application space and build a Lucene index of every valid web page and their meta content. Here's the problem. When I run the crawler from a debug server instance of Visual Studio Express, and provide the starting instance as the IIS url, it works fine. However, when I do not provide the IIS instance and it takes its own url to start the crawl process(ie. crawling its own domain space), I get hit by operation timed out exception on the Webresponse statement. Could someone please guide me into what I should or should not be doing here? Here is my code for fetching the page. It is executed in the multithreaded environment.
private static string GetWebText(string url)
{
string htmlText = "";
[code]...
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Dec 7, 2010
I have an .Net Framework #4.0 application that makes a large number of web requests using the WebRequest/WebResponse classes , as i see it has memory leak (or maybe i am doing something wrong)I Wrote some small simple application that demonstrates this:
class Program
{
public static void Main(string[] args)[code]...
The only one solution i came up with is use GC.Collect() (unmarked in example) , All the object are disposed , all streams are closed , am I missing something ?I found something but i don't understand the reason , if i minimize Console the memory usage decreases and looks O.K , what can be the reason for that is there a problem with Conosole or WinForm .
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Sep 26, 2011
I'm trying to make a webpage that get's a url from another web page (this other webpage works fine in a browser, both IE and FF) but when I make the webrequest call the returned page is a 500 internal server error. Here's the code:
Imports System.Net
Imports System.IO
Partial Public Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
[Code] ....
Here's the error I'm getting:
Code:
System.Net.WebException: The remote server returned an error: (500) Internal Server Error.
at System.Net.HttpWebRequest.GetResponse()
at SW_GetDownloadFile._Default.GetDownloadFile(String Url) in C:Documents and SettingsvmMy DocumentsVisual Studio 2008ProjectsSW_GetDownloadFileSW_GetDownloadFileDefault.aspx.vb:line 24
The DownloadHandler.jsp page simply displays a text line being a text file download link, there's no html formatting or anything and when I paste that text into the browser it shows the text file contents just fine, I need my asp webpage to get that text file link so it can turn around and open it to parse the info.
I'm not in control of the DownloadHandler.jsp page so i can't alter that, the Java team wont make any changes to it either.
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Nov 12, 2010
I've just updated my MVC2 project to run MVC3 (RC). Everything is working as expected except for one problem.
I'm running DotNetOpenAuth, but when I go to authenticate, my page renders the string
DotNetOpenAuth.Messaging.OutgoingWebResponseActionResult
instead of authenticating (which worked in the MVC2 app)
I found this question elsewhere on SO, and I did what was suggested, but to no avail.
Here is a clip of my Web.Config
</configSections>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
[Code]....
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Jul 19, 2010
i will be passing the xml file like this:
[code]....
error:
Error 1 The best overloaded method match for 'System.Xml.Linq.XDocument.Load(string)' has some invalid arguments
cannot convert from 'System.IO.Stream' to 'string'
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Jan 5, 2010
On my page which uses nested master pages, I have several user controls which are in their own UpdatePanels.
I've noticed that when I update something which is in UpdatePanel 2, things are shifting slightly in UpdatePanel 1. Someone told me that when UpdatePanels are used, the page is reloading anyway. Is this true?
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P.S. All update panels are set to Conditional in their UpdateMode's.
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Mar 26, 2010
I have an asp.net app that uses System.IO.Path.GetTempFileName() for temporary files. In the production IIS environment (W2K3), the temp folder (System.IO.Path.GetTempPath()) points to C:WindowsTemp. But on my XP dev machine it's C:documents and settingsmachinenameASPNET emp.
Is it possible to change this folder without affecting other accounts on machine?
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May 26, 2010
I need to modifiy my web applicaiton without affecting current transaction.
i will be having some modification in almost all days.
Right now " i stop my application and update the necessary files and strat the application again". Means i am loosing all transaction in between that modification.
Is there any way i can update my changes without affecting transaction.
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May 26, 2010
We're having an issue with a .NET 3.5 WebForms site where occasionally our error logs start filling up with the following error message:
"Multiple controls with the same ID 'ctl09' were found. FindControl requires that controls have unique IDs."
I know very little about the exception as I have never seen it while debugging locally and have never caught it in the error logs soon enough to run a remote debugging session. I do know that an application pool recycle fixes the issue.
This only affects a single [high traffic] page in the site. The strange thing is that the site uses the pre-4.0 ID generation logic. So, when the page is working, there isn't an html element in the entire view source that isn't some autogenerated control ID prefix followed by a the 'actual' IDs (i.e. ctl09_someID_someOtherID).
What would case a control to randomly stop being built correctly? Other than the Global.asax, how can I trap this error and force the control to ... recompile? App pool to recycle?
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