Httphandler Version Aspx Code Behind Writing Image File?
Mar 31, 2010
We have encountered this difference in file creation while using a HttpHandler Versus a Code Behind Aspx page. We are reading a saved jpg/png picture as byte array from a 'Image' field in sql server database and create a physical file in the server. Both the Aspx Page and Httphandler use the same code pasted below.
//Begin
int docID = Convert.ToInt32(Request.QueryString["DocID"]);
var docRow = documentDB.GetDocument(docID);
// Retrieve the physical directory path for the Uploads subdirectory
string destDir = Server.MapPath("../../Uploads").ToString() + "\";
string strFileName = destDir + DateTime.Now.ToFileTime() + "_" + docRow.DocName.ToString();
FileStream fs = new FileStream(strFileName, FileMode.CreateNew, FileAccess.Write);
fs.Write(docRow.DocData, 0, docRow.DocData.Length);
fs.Flush();
fs.Close();
// End
After the file is created, it is viewable as a jpg/png Image only in Aspx Code Behind. While in case of HttpHandler it is not a valid Image.
i need to save multiple documents stored in SQL server as Image type to disk.
What i want to do is "backup" all files in a table (column) to disk, zip them and Response.TransmitFile(FilePath) to client.
I could use C# ot VB but that would require a lot of connections to database or a lot of server memory and i don't want that, becauze there are a lot of files to be saved Since SQL can write files to disk i was thinking about saving those files to disk directly from sql. Something like when u're doing a backup
I've run into a problem with WCF REST Service. I get:
Could not load type 'System.ServiceModel.Activation.HttpHandler' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
when running inside of the IIS in an ASP.NET 4.0 AppPool.
The problem seems to occur only if:Running inside of IIS When ASP.NET Comaptibility is enabled
Running in Cassini - no problem it works properly. Running with ASP.NET compatibility off - no problem it works.
It appears that it's some sort of handler version conflict trying to instantiate the wrong version of the handler that in turn tries to load an older version of System.ServiceModel, but I haven't been able to trace this down.
Anybody seen anything like this before and have any ideas how to track this down further?
I've looked in ApplicationHost.config and the master web.config files for System.ServiceModel and HttpHandler references but no luck.
I am working solo on an Asp.net/C# project created by someone in the past. I created two new web forms, and then built the prjocect and did the deploy using a TFS team build project. For some strange reason, my Aspx file is not getting copied to the destination DEV server. It does get copied to a temp folder on that server, but in the end, the team build is failing and not copying over the new Aspx file.
So until I figure out how to fix the team build script, is their a way to just copy the Aspx file out to the desired server location? That as well as copying out a dll which is associated with the build file?
In a Windows Service I implemented an HttpListener that will handle incoming HTTP Requests to a certain port, parse the query string, insert it in database and send a confirmation response. However, the clients said that they were a bit skeptical and asked if the same could have been done via a webpage. Like having an HTTPHandler listen to a certain port. Got me thinking. What would you do in my situation? Go with the HttpListener/Windows Service or HTTPHandler/.aspx?
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The code is already running in deployment H, and there's an aspx page and an aspx.cs code-behind file. The code is compiled for framework 2.0 which is the lowest common denominator of the two deployments. Deployment H has its own logos and styling which are coded in its aspx file.
Deployment W now wants to use this same page, but it wants its own logos and styling. There are also additional fields on the page that deployment H doesn't need.
I think it's easier to maintain one code base which is why I want the same code-behind file, but I am having trouble figuring out how to set this up in Visual Studio. Orginally, I was going to have two projects, one for W and one for H, but I'd have to make the same changes to both files when some of the common areas changes.
I want to use authntication which apparently only work on folders. Thus, I wanted to move the Default.asp file into a new folder that I created. When I tried doing this by cut and paste I ran into problems. I changed the reference in the first line of the aspx file "Page" but the code behind VB file no longer sees the aspx page. In other words, the reference to contorls like Listbox1 show up being undeclared.
Is there a way to move the Default file and the related code behind file to a folder so everything works?
The code I have entered below works fine in an .aspx file, however when I seperate the C# code into an aspx.cs file I get the red underlining for both 'UserAccountWizard' and 'RegisterPatientWizard'. Is there any solution to this as I'm completely baffled right now. Here is all of the code in the .aspx file:
I have an ASPX page that I am using to write JSON. It works great in Firefox and Chrome, but when I try and use it in IE 8 it gives me an "The XML page cannot be displayed" error instead of allowing jQuery to load the JSON being written by the response. Here is what my code looks like:
I have created an aspx file using in Visual Studio. I did this by doing NEW | Website | ASP.net Website and designing it. How do I create the C# code to handle the click events
.aspx file that I would have never even thought to look. It was occuring because of a control(ListView I believe) that had been "completely" commented out using the <!-- --> tags. The text was all green which gave me the re-assuring feeling that this code would not be included in the website. I finally decided to search my entire .aspx page for any occurences of the variable it kept insisting couldn't be "databound" and sure enough it was inside a template of a ListView control that was commented out.
First i created the TimeSheet.aspx file,then added code files names TimeSheet.aspx.cs file. created a TimeSheet class and code some code in that ,later in the @page directive added the codebehind attibute with value "TimeSheet.aspx.cs" and inherits attribute with value TimeSheet. Now i want to make this code behind file to show up as a sub-branch of TimeSheetp.aspx.Just like a designer file.
I am in the process of moving all of the images in my web application over to a CDN but I want to easily be able to switch the CDN on or off without having to hard code the path to the images. My first thought was to add an HttpHandler for image extensions that depending whether a variable in the web.config (something like ) will serve the image from the server or from the CDN. But after giving this a little though I think I've essentially ruled this out as it will cause ASP.NET to handle the request for every single image, thus adding overhead, and it might actually completely mitigate the benefits of using a CDN.
An alternative approach is, since all of my pages inherit from a base page class, I could create a function in the base class that determines what path to serve the files from based off the web.config variable. I would then do something like this in the markup:
<img src='<%= GetImagePath()/image.png' />
I think this is probably what I'll have to end up doing, but it seems a little clunky to me. I also envision problems with the old .NET error of not being able to modify the control collection because of the "<%=" though the "<%#" solution will probably work.
I have read about the file upload control in asp.net and tried it and works great. But I want to know if I can use it for another purpose. I have a video capture control that can be used for webcam apps or anything else. It has a method called HTTPUpload where it will upload an image file to the server using the HTTP upload protocol. My question is can i use the .net FileUpload control for this? And if so, how can I pass the image file straight to the .aspx page without having to submit a button? Would the file be as a query string variable?
Arguments: WebServer = web server address WebPage = name of upload web page Fields = list of 'fieldname' and 'fieldvalue' values delimited with '|' Files = list of 'fieldname' and 'file path' values delimited with '|' Returns TRUE if successful, or FALSE otherwise. Example vcx.HTTPUpload "[URL] , "upload.asp", "field1|value1|field2|value2" , "file1|c:foldermypic.jpg|file2|c:foldermyvideo.avi"
Below I have some code that I am using to give the user the option to save or open a file. However, for whatever reason, when it does this it appends everything that is in my .aspx page to the end of my file. I've no clue why this is happening or how to fix.
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