File Saveas Using Handler?
Nov 27, 2010i write a html code for file saveas using file uploading control. here file saveas working for aspx code but not working for html code to call handler(ashx).
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Everything works fine. Accept when for big file size. e.g. I've got a file (jpg) 5.5 MB. When I try to upload this file I get an the error below.
The strange thing is I the button upload file eventhandler I check the file size. If (intFileesize < intFileSizeLimit) etc.
But the strange thig is I remove all the code in Upload eventhandler for testing/debugging and I still get the error below. So the error occurs outside the Button handler. I mean the error cause is not by Fileupload.SAveAs etc.... So the question is how can I avoid this. I mean I have built restriction of 1 mb, but This code is not reached.
I don't have any problems with small sizes e.g. I could upload 400 kb w/o problem.
So the question is what is the cause for the big file size how can I solve this?
Other question is: Is there a tool or whatever to crop the filesize and upload? I mean even if they upload 6 mb picture, I should crop that to 50kb or whatever during upload. How to aproach this? maybe a 3rd party freeware?
ERROR I get after 2-3 seconds
Oops! This page appears broken. HTTP 404 - File not found.
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[Code]....
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[Code]....
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[Code]....
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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] ....
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public void ProcessRequest(HttpContext context)
{
if (this.FileName != null)
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[code]...
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[code]....
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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.
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The code I am using is:[Code]....
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