C# - Multipart File Uploads, Can The Data Be Written To Disk Rather Than Read Into Ram
Jul 31, 2010
I'm using ASP.NET for file uploads, and I'm hitting a bit of a snag in that data sent by the client as multipart form data is read straight into RAM.
Obviously, this means maximum file upload size is limited to the available RAM on the machine, and even then is much smaller as soon as you have multiple simultaneous uploads.
Is it possible to get ASP.NET to write the data to a temporary file on the hard drive as it is recieved rather than reading into RAM?
I have a css file which I want to read from disk and in that content I want to find and replace all linebreaks (do I look for vbCrlf or ...?)
Public Shared Function GetFileContents(ByVal FullFilename As String) As String Dim filecontents As String = "" If File.Exists(FullFilename) Then Dim objStreamReader As StreamReader objStreamReader = File.OpenText(FullFilename) filecontents = objStreamReader.ReadToEnd() objStreamReader.Close() End If Return filecontents End Function
So in the returned variable "filecontents" I want to find and replace any linebreaks.
I have two examples to show you what I want to achieve here. But to point what's different about my question, Is that I'm having a parametrized URLs and I want to implement URL rewriting to my application. But I don't want to convert the parameter in the URL to be placed between slashes..."page.aspx?number=one" to "pages/one/" << NOT!
First example:
http://localhost:1820/Pages/Default.aspx?page=2&start=5 To http://localhost:1820/Pages/page2
Second example:
http://localhost:1820/Items/Details.aspx?item=3 To http://localhost:1820/Items/ItemName
But I'll still need all the parameters in the original URLs
I have a lot of requests that read my Web Config file (eg. variable = WebConfigurationManager.AppSettings["BLAH"]). I am wondering... Do WebConfigurationManager.AppSettings read from disk each time, or is it cached in memory. If it's read from disk each time then I guess I will need to move the variable to a static variable so as to improve my app performance...
I need to do multiple file uploads in my ASP.NET page. I also have to display a progress bar with the status of the file transfer. It should display an all file progress status bar separately and a total in a separate progress bar until the file upload has finished.
I have a page currently setup to upload 1 image at a time, it uploaded the image, then creates a thumbnail for that image in the same directory. Client needs / wants to be able to upload a few more images at the same time. So i would like to see if i can use the existing code that works, but setup to upload a few more images and process them all to create the thumbnails.
I currently have a page that allows them to upload 5 images at a time and that works fine, but its just simple uploading the images, nothing else is happening at that moment.
I recently embarked on the endeavor of creating my own asynchronous file upload components for ASP.NET. I took lessons learned form Darren Johnstone's FileUpload project and created an HttpModule for extracting the files from the submitted data.
I got everything working as it should in testing with VS 2008 using the Development Server. I even went so far during my testing to ensure that the request was being intercepted by the module before the files began uploading. After I was satisfied with things, I deployed the project to our web server (Win 2008 w/ IIS 7). I was horrified to learn that the controls were not functioning when deployed.
After some remote debugging, I found that the HttpApplication.AuthenticateRequest event (my location for hooking in to the process) was not being invoked until the files were completely uploaded.
I am using Adobe Captivate 5, and ime trying to create an ASP script which will store the results from a quiz in an SQL database. The problem I am having is that captivate is posting the results from the quiz in multipart/form-data format and I am unable to retrieve the variables in my ASP script.
I have tried request.form("test") and fileUpload("test") and neither retreives the varibales.
What is the syntax to retrieve data that has been posted in the multipart/form-data format???
i want to export an excel from my web application and want to save it on Web Server, but i am not able to save it on web server, i am able to do it on my local machine, but on web server it's not working.
On my current project I have to accept 2 Excel spreadsheets that will be uploaded by clients, process them and create a download package based on this information. This process includes extracting data from the sheets, updating our databases and building several PDF files for the download package. This takes between 15 seconds to 2 minutes to complete, depending on the complexity of the request. Naturally, I want to show some kind of processing indicator rather than just leaving the user hanging while the page loads.
Here's the problem: How to show this processing indicator.
I have to do a full postback to upload the files so this eliminates several nice AJAX indicator methods (sponsoring users rejected the AJAX toolkit async file upload, saying it was confusing to them). If I process on any of the page events during the postback, the page doesn't load until the lengthy process is completed so the browser/site looks 'hung'.
Basically, I need some ideas on how to display a 'building your download' graphic while the lengthy process is working that will also work with a full postback.
how to download a file , from sql server 2005 to local disk.
using asp.net and c# as my code behind, when i click on gridview column, a pop up windows should appear asking fr the path to save in local disk, when name is entered and save button is clicked, that particular file should get saved in disk.
i'm developing a web application using asp.net 3.5 sp1, my issue is , i need to upload multiple files asynchronously.
for that i used the ajax control toolkit "async file upload", where i can only upload single file and cannot track the filenames after uploading, so i go for the "file uploaded ajax"
[URL]
when i started including the cascading dropdown in that page("mainpage.aspx") , an error occured in the page, ie; when i click add files of the "file upload ajax", the "file upload" control some times doesnot show, so i created another page("testpage.aspx") and included the "file upload" control in that page and created an iframe in the "mainpage.aspx" and call the "testpage.aspx", now it is working fine, but i was not able to track the filename, can i access the control inside that iframe from the "mainpage.aspx" ?
I have downloaded a AsyncFileUpload example, I edited the uploadError javascript and now it is working perfectly:
[Code]....
It works perfectly how I wanted it, like this: I upload a file, if it's an Image I get the Lime AsyncFileUpload background, and the file name and size are written under the AsyncFileUpload, if it's not an Image, I get the error label shown, with red AsyncFileUpload background, and if I upload another file, it keeps working the same thing every single time, but only shows the last uploaded image name at the end of an image upload, not all of the images.I tried to merge it with my website, and ended with this code:
[Code]....
but in my website its just working the first time only, then rest times I'm getting the uploadError() function working instantly when I click upload, even if i have selected an image or anything else.
I am using ASP.NET 3.5 with iTextSharp and I have the following code:
var templatePath = Server.MapPath(@"~/Templates/template1.pdf"); var newFilePath = Server.MapPath(@"~/TempFiles/new.pdf"); PdfReader pdfReader = new PdfReader(templatePath); PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileStream(newFilePath, FileMode.Create)); AcroFields pdfFormFields = pdfStamper.AcroFields; pdfFormFields.SetField("Box1", "007"); pdfFormFields.SetField("Box2", "123456"); pdfStamper.FormFlattening = false; pdfStamper.Close(); Response.ClearContent(); Response.Buffer = true; Response.ContentType = "application/pdf"; Response.AddHeader("Content-Disposition", "attachment;filename=new.pdf")); Response.WriteFile(newFilePath); Response.End();
The above code fills out a pdf file and saves the new file to the TempFiles folder. It then prompts the user to either save or open the file. Can I achieve the same functionality without saving the file to the TempFiles location?
I need to be able to read an excel file from a file upload control but I can not save the file to disk first, it must be done in memory.
[Code]....
Above is my code for reading the data file if it IS saved to disk, but again, I have to be able to do this without saving the file to disk, it must be done in memory. I have not been able to find any sample code anywhere on how to do this from memory, everything seems to force the file be uploaded, saved to disk, and then read in the connection string, which again I can not do.
