Data Controls :: How To Use Generic HTTP Handler For Saving Data
Mar 26, 2016How I can save data into database using this method JSON Generic HTTP Handler example in ASP.Net?
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C# - PlatformNotSupportedException When Saving A File From Silverlight Through A Generic Handler
Jul 30, 2010I have a Silverlight application hosted in an ASP.NET site, through which I'm starting an HttpWebRequest to a Generic Handler in order to save a CSV file to the user's machine.
From the Silverlight app, a Uri is constructed with parameters to make the CSV file server-side. A button is clicked which triggers the following:
string httpHandlerName = "HttpDownloadHandler.ashx";
// CustomUri handles making it an absolute Uri wherever we move the handler.
string uploadUrl = new CustomUri(httpHandlerName).ToString();
UriBuilder httpHandlerUrlBuilder = new UriBuilder(uploadUrl);
httpHandlerUrlBuilder.Query = string.Format("{3}startdate={0}&enddate={1}&partnerId={2}", startDate, endDate, partnerId, string.IsNullOrEmpty(httpHandlerUrlBuilder.Query) ? "" : httpHandlerUrlBuilder.Query.Remove(0, 1) + "&");
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(httpHandlerUrlBuilder.Uri);
webRequest.Method = "POST";
webRequest.BeginGetResponse(new AsyncCallback(GetResponseCallback), webRequest);
Now here is the ProcessRequest code from the HttpDownloadHandler.ashx
public void ProcessRequest(HttpContext context)
{
_httpContext = context;
string partnerId = _httpContext.Request.QueryString["partnerId"];
string startDate = _httpContext.Request.QueryString["startDate"];
string endDate = _httpContext.Request.QueryString["endDate"];
ExportCsvReport exportCsv = new ExportCsvReport();
_csvReport = exportCsv.ExportMemberRegistrationReport(partnerId, startDate, endDate);
context.Response.Clear();
context.Response.AddHeader("content-disposition", "attachment; filename=Report.csv");
context.Response.ContentType = "text/csv";
context.Response.Write(_csvReport);
}
Here is the HttpResponse header information that comes back when the Save File Dialogue refuses to appear:
{System.Web.HttpResponse}
Buffer: true
BufferOutput: true
Cache: {System.Web.HttpCachePolicy}
CacheControl: "private"
Charset: "utf-8"
ContentEncoding: {System.Text.UTF8Encoding}
ContentType: "text/csv"
Cookies: {System.Web.HttpCookieCollection}
Expires: 0
ExpiresAbsolute: {1/1/0001 12:00:00 AM}
Filter: {System.Web.HttpResponseStreamFilterSink}
HeaderEncoding: {System.Text.UTF8Encoding}
Headers: 'context.Response.Headers' threw an exception of type 'System.PlatformNotSupportedException'
IsClientConnected: true
IsRequestBeingRedirected: false
Output: {System.Web.HttpWriter}
OutputStream: {System.Web.HttpResponseStream}
RedirectLocation: null
Status: "200 OK"
StatusCode: 200
StatusDescription: "OK"
SubStatusCode: 'context.Response.SubStatusCode' threw an exception of type 'System.PlatformNotSupportedException'
SuppressContent: false
TrySkipIisCustomErrors: false
When I navigate to localhost/HttpDownloadHandler.ashx while the site is up, without initiating it from within the Silverlight app - the Save File Dialogue appears just fine, it seems to be a case where Silverlight is not accepting the response header properly.
Forms Data Controls :: Display Data Using Generic Web Handler?
Feb 4, 2011I want to bind gridview partially for e.g. show only 10-20 records first and next 10-20 records after scrolling on panel. For that purpose i want to fill gridview using generic handler in asp.net.
Actually i want to know how to return dataset or datatable or xml using generic handler in asp.net.
AJAX :: HTTP Generic Handler For Captcha Image Not Working Inside Update Panel
Mar 23, 2013I 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?
Send JSON Data To HTTP Handler?
Nov 14, 2010i have an ASP.NET 4.0 HTTP handler that should receive and send data in json format. I'm using jquery to send json objects serialized in a string to the handler. It correctly sends the request but i don't know how i could retrieve the data from the httpcontext passed to the handler and how i could deserialize it..
UPDATE 1
$.ajax({
type: "POST",
url: "myurl.ashx",
dataType: "json",
contentType: "application/json; charset=utf-8",
data: $.toJSON({
...
}),
success: function (response) {
...
}
});
HttpHandlers / Modules :: Generic Handler / Prevent Data From Being Written To Live Table Via The Live.aspx Page?
Jun 28, 2010I am using a generic handler (indicator.ashx) to create a graphic that is overlayed from information from a table (called LIVE) from our SQL database. This is working very well and I am very happy with the results.
However I am having an undesirable issue where the query string that is used for this is also being accessed by another page (called ReceiveLive.aspx) which is populating our LIVE table with data when we don't want this. I have been able to track this issue down to our generic handler that seems to populate this table with data whenever the handler is accessed.
The query string that is used to access our graphic through our generic handler is
http://mydomain.com/indicator.ashx?ID=ABC001.
Our other page that writes data to our LIVE database used the query string
http://mydomain.com/live.aspx?ID=ABC001 which is normally only accessed by a small piece of software that sits on the users PC and sends the data when necessary.
My question is this: How do I prevent data from being written to our LIVE table via the Live.aspx page everytime a query string is processed by my indicator.ashx is accessed?
How To Call Static File Handler From HTTP Handler In IIS7 And 4.0
Jan 24, 2011I 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.
View 1 RepliesHttpHandlers / Modules :: Redirect A Page From Http To Https Using Http Module Begin Request Handler?
Jul 15, 2010i 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
View 3 RepliesHow To Pass Through Http Call With HTTP Handler
Jan 4, 2011Background:
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?
What Is HTTP Module And HTTP Handler
Jan 20, 2010clear 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?
Handler And Generic Handler?
Mar 16, 2010In Visual Studio 2010, when you say new Item, you can see Asp.NET Handler and Generic Handler. Can you tell me what's the difference, I think it came with .NET 4.0 because I couldn't find related thins on Google.
View 1 RepliesAsp.Net Routing To A Generic Handler?
Sep 20, 2010I Have a generic handler that's serving member logo images:
http://site.com/logo.ashx?memberid=123
Now, I want to use it by caling a url like:
http://site.com/logo/john.jpg
So I would create a route for that (pattern: "logo/{username}.jpg"). But, my problem is - how do I retrieve {username} when inside ProcessRequest() of my generic handler? It's not a page, so I can't get Page.RouteData.Values.
Looking For A Generic Handler / Service For Mongodb?
May 25, 2010I am new to MongoDB and have a perfect place in mind to use it. However, it's only worth it if I can make the queries from JavaScript and return JSON.
What's the easiest way I can implement a generic service/handler in asp.net/c# that would allow me to interact with mongodb via JavaScript? I understand JavaScript can't call mongodb directly, so the next best thing is what I'm looking for.
C# - Dynamic Image (from Db) Using Generic Handler
Feb 9, 2010I'm trying to using a Generic Handler to retrieve and display images that are stored in a database.
But its just not working. Ive tried verious of the code below, but I cant seem to get it to work.
<%@ WebHandler Language="C#" Class="IconsDb" %>
using System;
using System.Web;
using System.Linq;
using System.Data.Entity;
[Code]....
Ajax - .net Generic Handler Encoding ?
Sep 6, 2010I'm sending values to Generic Handler via Ajax like that way.
xmlHttpReq.open("GET", "AddMessage.ashx?" + (new Date().getTime()) +"&Message=" + Message,true);
when message contains they are looking like that on Handler in context.Request. these characters are looking as it should. But in context.Request.Url they are looking like and when i want QueryString values it gives me what can i do?
Secure Generic Handler Calls?
Jul 9, 2010I am creating a myspace application and for some database entries I am using generic handlers which I have hosted on another website. From my myspace application I use ajax calls to those handlers to perform the activities that I want. I want to know how can I make these ajax calls secure? I mean I want to be sure that the handlers are being called by only the myspace app and not by entering url into the browser etc.
View 2 RepliesWeb Forms :: How To Use Session In Generic Handler
May 7, 2015i want to access session value after login ..temrory procedure i knw but i heard about ashx file to manage session so what is the method to use it?
View 1 RepliesA Generic Error Occurred In GDI+ While Saving The File?
May 12, 2010When I enter the full hard disk path as a parameter of the method Image.Save, I get no error and the file is being saved on the desired location. But I want the image saved inside Web project folder of the application so I use this code:
myImage.Save(Server.MapPath("SomeApp.Web/report.png"), System.Drawing.Imaging.ImageFormat.Png);
and then I get the following error. Logically, this path is OK, so why error?! PS. myImage is of type System.Drawing.Image.
How To Get The Virtual Path Of A File From A Generic Handler
Mar 22, 2011How can i resolve a virtual path to a file into a path, suitable for the browser, from within a generic .ashx handler?
e.g. i want to convert:
~/asp/ClockState.aspx
into
/NextAllowed/asp/ClockState.aspx
If i were a WebForm Page, i could call ResolveUrl:
Page.ResolveUrl("~/asp/ClockState.aspx")
which resolves to:
/NextAllowed/asp/ClockState.aspx
But i'm not a WebForm Page, i'm a generic handler. You know, that IHttpHandler object with all kinds of things injected:
[Code]....
C# - Send Html Text To Generic Handler?
Mar 1, 2011I have a WYSIWYG editor on one of my forms and I want to send the contents of the editor to an ASP.NET generic handler for processing via an Ajax call.
I am having a little bit of trouble parsing the html received.
Client Side:
$(function(){
$('.send').bind('click', function(event){
var message = $('#TxtMessage').htmlarea('toHtmlString');
message = escape(message);
[Code]....
So the problem is that even when I call Server.HtmlDecode(string) the message is garbled.
Web Forms :: Download File Using Generic Handler
May 26, 2013I want to download any type of file on button click,so have created a .ashx page and redirected the .aspx page to the .ashx page.Is this way correct to do the task.Below mentioned code works fine.
<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
var fileName = "Tracing.pdf";
[Code] ....
Web Forms :: JSON Generic Handler With CallBack
Jun 16, 2015I need to provide the json string as response to the request made using webrequst as : [URL] ....
Above request will come from other application using webrequest ...
How to implement the page(aspnet.aspx) which handles the request and gives the json string as response. I know how to made webrequest. I am struggling at server end. How to receive request and give response as json string.
Session Not Working In Generic Handler .ashx In Firefox?
Apr 28, 2010I have created .ashx which implemented IRequiresSessionState, so I can create session variables in that ashx, it worked in IE, but doesn't work in Firefox.When access this session variable from other pages it's NULL.
View 1 RepliesServing An Image With A Generic Handler Within A List View. Is It Possible
Feb 27, 2011Currently in my webpage i load images to the ListView object as follows...
<ContentTemplate>
<asp:ListView ID="ListView1" runat="server">
<layouttemplate>
[code]...
Content Type When Serving A File In A Generic Handler?
Dec 10, 2010I'm busy writing a handler to serve various documents for download or presentation in web forms pages. The documents range from various image formats, to PDF, to MS Office documents, to generic binaries. My basic draft of the download process is as below:
[code]....
However, I have some misgivings about lumping all documents together as application/octet-stream, and I would prefer, if feasible, to use a more specific content type per document type. I have a DB table for document types where I could store this. Am I going in the right direction, and if so, where can I find a suitable starting list of content types for document types?