Create Dynamic Images From WPF User Control Inside An HTTP Handler?
Dec 1, 2010
I'm using Microsoft's PivotViewer control in one of my Silverlight projects. I'm creating a JIT collection and was hoping to dynamically generate the images based on the rendered result of a WPF UserControl. In order to generate the images I'm using an HTTP Handler to serve the images up dynamically.
how I might best go about this. It's all quite a mashup of technologies and a bit difficult to know where best to begin.
EDIT: I have found a guy that's done this in ASP.Net MVC here -
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Jul 10, 2010
I am new to this topic. SO please look over my stupid mistakes. I have web application and its virtual directory path is as followshtpp://localhost/TxtXmlImggHandler/This root has three pages one for text, one for xml, one for images. Actually these pages call three different handlers. I had no problem when I send/receive some data to HTTPHandler for processing, had no problem when I request xml file from HTTPHandler.Now I am trying to get image from HTTPHandler, but no luck. All my HTTPHandlers are sitting in root of my web application
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Jan 5, 2011
Basically I have a web site that renders HTML preview of some documents (mainly office). The resulting HTML fragment is included in the page returned by the same web site, however images are returned by HTTP handler from another site with the following links:
<img width="50" height="50" src="http://portal/Service/GetFile.asxh?id=123&inline=true">
For some reason all browsers except Chrome (e.g. IE6/7/8, Firefox, Opera, Safari) show everything just fine, however for these images Chrome shows "broken image" icon. If I choose "Open image in new tab" then the image is shown just fine.
Edit I thought I have solved this issue, but apparently with Fiddler turned on it works fine.
I had context.Response="utf-8" left in code, but removing it had no difference.
Headers:
HTTP/1.1 200 OK
Date: Wed, 05 Jan 2011 14:26:57 GMT
Server: Microsoft-IIS/6.0
MicrosoftOfficeWebServer: 5.0_Pub
[Code]....
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Aug 17, 2010
I want to use HTTP Handler in order to create a RSS feeds. For the purpose, I want to put my logic for creating the rss XML in C# class, which implement IHttpHandler, then to "map" this handler into the web.config file and to register the "mapped name" in my routing rules. I am doing something like this:
public class RSSFeedHandler:IHttpHandler
{
public void ProcessRequest( HttpContext context )
{
[code]...
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Mar 23, 2013
I tried this link to generate verification Image [URL] ..... It works fine.
But I'd like to put a button in page for regenerating captcha for example. When the image was unreadable for user.
So I put an updatepanel in page and this is my code:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<tr> <td colspan="2">
<asp:Image ID="imCaptcha" ImageUrl="~/Captcha.ashx" runat="server" />
[Code] .....
Although the image changes but the whole page is refreshed. Whether this is due to incompatibilities httphandler and updatepanel?
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Mar 15, 2010
I have the next problem: I need to process only 1 request at a time from each user. Lets assume that server identifies each user be UserID, sent in query string.cHow can make the server work the way like FIFO (do not start processing next request until the previous is fully processed)? Should I use the named mutexes inside HTTP handler and assign the name to mutex by UserID?
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Jan 25, 2011
I'm having difficulty trying to create and persist controls inside of a gridview during postbacks. I have an unbound Datagrid control which is created with x number of rows and y number of columns during the Page_Load event.
[Code]....
During the RowDataBound event of the GridView, I create a placeholder control and then I create a label and add the label to the placeholder
[Code]....
On the first page load when navigating to the page, the grid dispays perfectly and the labels are created with no issues and I can see the "1" in every single cell of the Gridview. I basically need the labels in the cells to store an ID when the cell is clicked (the click event works with no issues, wired it all up with javascript) and Since the Cells to not exist prior to "Building the matrix" method, How can I persist the Label controls inside of the tablecells between postbacks so I can assign and read values from them.
I've read a number of online posts from 4guys from rolla and they demonstrate how to persist a handful of controls dynamically created in a staticly defined PlaceHolder conrol outside of the complicated setup of the gridview and have failed at adapting them. The golden rule seems to be to 'recreate' the controls during Page_PreInit during the postback, but I can't seem to get it working.
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Nov 25, 2010
I have an VS2010 ASP.NET 4 web site app, to which I added the new Chart control.
When I deployed it to our web server, we get a" Internal Server Error 500." message.
I noticed that the following lines were added to the web.config since the last release, related to the chart control:
<system.web>
<httpHandlers>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
validate="false" />
</httpHandlers>
If I remove this added code from the web.config, the site works--Except for the charting functionality.
How do I get the site and the chart page to work?
This is not an issue on IIS versions < 7.
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Aug 10, 2010
How can I get all the textboxes inside a create user wizard control using getElementsByTagName().
Below is my JQuery code:
[Code]....
The above code isn't displaying hint text when the textbox retreives focus.
I think there is something wrong with this getElementsByTagName("asp:TextBox"); , I have also tried getElementsByTagName("TextBox"); , getElementsByTagName(":textbox"); and getElementsByTagName("input"); .
But no one of them gets the textboxes array.
Can anyone tell what will be the correct syntax for getting all the textboxes inside a create user wizard control using getElementsByTagName()?
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Sep 6, 2010
I have created a dynamic grid view using Itemplate .now i have also created a dynamic drop down list in the grid . how to create a event handler for on selectedindexchange .
i created a slectedindexchange event but it didnt work .the control never passes to the event ?
what to do create a event handler
[Code].....
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Jan 24, 2011
I create custom HTTP handler for auto generating file and I want to tell IIS7 to serve current request like normal static file because I need to use IIS and web.config file to control compression setting and any other HTTP header of current requested file.I know. there is an internal class called StaticFileHandler in ASP.net. But I cannot access it. Or you have any other way to work like this.
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Jul 15, 2010
i redirect a page from http to https using http module begin request handler .i am calling webservice using ajax but it is saying webserice not defined .which otherwise works fineits work fine when rediect page in page_load instead .but i need to add function for https to http in every page. i still not know why ajax is not working when i use http module for redirect
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Feb 1, 2011
This is a weird issue. I have a List view with 2 Link buttons. "Edit" and "Delete" Iam able to attach an event handler for the first linkbutton(Update). Code in the event handler executed fine. But If I try to attach a event handler for the second link button(Delete) , I get an error.
My Item Template Looks like this.
[Code]....
First Item works absolutely fine. But If I attach the second handler, I get the following error
Am I missing some thing ? Note - There is no error if I try to attach the 1st event handler to the second link button.[ie EditLinkButtonClicked to DeleteLinkButtonClicked ] Issue occurs only when I try to attach DeleteLinkButtonClicked to DeleteLinkButton
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Mar 8, 2010
The code below creating a button control on my page dynamicly.
I would like to add to the control's Click event a new event handler.
How should I do it?
i'm creating the control on Click-event of one of the pre-defined buttons( btnSubmit) on my the page and
not at the Load event of the page:
[Code]....
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Jan 4, 2011
Background:
We are using the Facebook API and receive back URLs for profile image thumbnails. Unfortunately the protocol is restricted to just HTTP and it doesn't support HTTPS. The page on our site that hosts the thumbnails is always delivered via HTTPS, and if we use HTTP for the thumbnails the user will receive security warnings from their browser.
Solution:
Build an HTTP Handler that "passes through" the image from the Facebook URL, but allow the handler to be called via HTTPS. Before I started coding I thought I could something like this:
Response.OutputStream = WebRequest.Create(FacebookUrlForThumbnail)
but I ended up having to save the image to an object in memory than write the image to the Response.OutputStream using the image save function.
Current Code:
[Code]....
This seems inefficient but I can't find a way of using the HTTP Handler as I orginally intended. Is there way of accomplishing the goal without creating the image memory and just "passing through" the call?
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Nov 11, 2010
i have a calender control like this
<asp:Calendar ID="CldrDemo" runat="server" BackColor="#FFFFCC" BorderColor="#FFCC66"
OnSelectionChanged="CldrDemo_SelectionChanged" OnDayRender="CldrDemo_DayRender">
</asp:Calendar> [code].....
i want to call the event handler for the dropdownlist - selectedIndexchanged and i have added it also like this
protected void ddlBlist_SelectedIndexChanged(object sender, EventArgs e)
{
}
but this is not getting fire when i am changing the item of the dropdownlist.
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Apr 14, 2013
Show google map with markers and list the address in listview.I have created 20 images of google marker numbered from 1 to 20(Example marker-1.jpg,marker-2.jpg....marker-20.jpg).If i want to display 20 locations in google map with makerimages numbered from 1-20,how can i set the url of the icon in the marker options?Here's the code i have written.
var markers = [
<asp:Repeater ID="rptMarkers" runat="server">
<ItemTemplate>
{
"title": '<%# Eval("Name") %>',
"lat": '<%# Eval("Latitude") %>',
"lng": '<%# Eval("Longitude") %>',
"description": '<%# Eval("Description") %>'
[code]...
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Jan 20, 2010
clear my concept What is HTTP module and HTTP Handler and how does they work while page requesting???
How authentication and Authorization process work in asp.net?
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Mar 10, 2011
I understand I need to load my dynmaic control on every postback and preferrably in Page_Init(). But my dyanmic controls are loaded from a dropdownlist selectedindexchanged event handler. Now after any postback, my dynamic controls are gone. How would I force it to load on every postback ?
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Jun 29, 2010
Currently have Main.MasterPage, a MyNewPage.aspx (with master page file) and a use control with buttons. Should I load the events in the MyNewPage.aspx during the Page_load or during the InitializeComponent() ?
Example: MyNewPages.aspx (HTML)
[Code]....
Or Should I do this??
[Code]....
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Jun 11, 2010
I have to access the parent form's controls inside an event handler method on my user control's code behind.
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Apr 6, 2010
I want to apply a key press handler to a User Control. So there is no <body> there. where I should place onkeypress="keyPressHandler(event)"?
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Jul 16, 2010
I have a web page where I'm dynamically loading one of a series of user controls. In each user control I call a general-purpose event to inform the web page that data on the user control has changed and/or new data is available. On the user control I define the Event Handler like this: public override event EventHandler DataOut_Handler; and then I force the event to occur like this:
DataOut_Handler(sender, e); On the web page I reload the previously loaded user control and wire up the event handler like this:
protected void Page_Init(object sender, EventArgs e)
{
DataEntryUserControlBase userControl = (DataEntryUserControlBase)LoadUserControl();
if (userControl != null)
userControl.DataOut_Handler += new EventHandler(UserControl_DataOut_Handler);
}
Note: It's "DataEntryUserControlBase" rather than "UserControl" because I constructed an intermediary base class to making casting simpler. Everything seems to work fine but I do have a question: When I step through my code, after the last line in Page_Init is executed I move the mouse cursor over top of userControl.DataOut_Handler but it reads null. The code is working fine but I'm most curious why I don't see any object associated with that item immediately after wiring up the event handler?
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Mar 10, 2011
I have a web user control that represents a simple message box. It is used to display simple messages like "Item has been deleted", or "The item was saved successfully".
On the other hand, I have another web user control that represents the item in the form of an editable form (I made this a user control because this is used in two different pages). I want to embed an instance of the message box user control inside the editable form. I am writing this right after the @Control directive:
[Code]....
Instead of using @Register directives, I register the user controls in web.config and so far this has worked just fine.
With the above markup, the project compiles, but whenever I try to navigate to a page that contains this construct, I get an HttpParseException exception. Furthermore, Visual Studio states that the tack w7rc9:MessageBox doesn't represent a known control.
What am I doing wrong?
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Apr 9, 2010
I've created a multiple uploadfile user control - upload_multiple_files.ascx:
[Code]....
which has an update panel ID = up_upload_multiple_files this user control will be placed inside a modalpopupextender. My question is when I click in any button AddFile, RemvFile, Upload there's a postback so the page is reloaded and the modalpopupextender disapears Is there a way to to troubleshoot this?
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