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For that reason, it s common to add a Button control to post back the page To get information about the posted file content, you can access the FileUploadPostedFile object You can save the content by calling the PostedFileSaveAs() method, as demonstrated in the following example Here s the event-handling code for the ButtonClick event: protected void cmdUpload_Click(object sender, EventArgs e) { // Check if a file was submitted if (UploaderPostedFileContentLength != 0) { try { if (UploaderPostedFileContentLength > 1064) { // This exceeds the size limit you want to allow // You should check the size to prevent a denial of // service attack that attempts to fill up your // web server's hard drive // You might also want to check the amount of // remaining free space lblStatusText = "Too large This file is not allowed"; } else.

This wouldn t be at all possible if the values had to be stuffed into model fields with specific data types, which included either data validation or type-checking Instead, we can rely on the fact that all form data, when submitted back to the server, arrive as strings These strings must be converted to native Python objects as part of the form validation process, so the strings themselves are the last chance to get the actual raw data from the submitted form Better yet, since they re all strings, Django provides an easy way to store them for later use: A is necessary, because different form values provide different lengths of data, some of which will likely extend beyond the 255-character limit of .

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{ // Retrieve the physical directory path for the Upload // subdirectory. string destDir = Server.MapPath("./Upload"); // Extract the filename part from the full path of the // original file. string fileName = Path.GetFileName(Uploader.PostedFile.FileName); // Combine the destination directory with the filename. string destPath = Path.Combine(destDir, fileName); // Save the file on the server. Uploader.PostedFile.SaveAs(destPath); lblStatus.Text = "Thanks for submitting your file"; } } catch (Exception err) { lblStatus.Text = err.Message; } } } In the example, if a file has been posted to the server and isn t too large, the file is saved using the HttpPostedFile.SaveAs() method. To determine the physical path you want to use, the code combines the destination directory (Upload) with the name of the posted file using the static utility methods of the Path class. Figure 13-3 shows the page after the file has been uploaded.

Figure 13-3. Uploading a file You can also interact with the posted data through the stream model, rather than just saving it to disk. To get access to the data, you use the FileUpload.PostedFile.InputStream property. For example, you could use the following code to display the content of a posted file (assuming it s text-based):

// Display the whole file content. StreamReader r = new StreamReader(Uploader.PostedFile.InputStream); lblStatus.Text = r.ReadToEnd(); r.Close();

With a reliable way to store values, the next step is to identify what other information must be stored in the database, in order to reconstitute the form Obviously the names of the fields would be included, so the values could get put back in the right place Also, since different forms could have different structures, with different numbers of fields, it would be best to give each field s value its own row in the database That means there would need to be a way of keeping fields together as part of a form The trick here is that forms don t have a unique identifier After all, they re not normally expected to exist outside of a specific request/response cycle, except for validation corrections,.

By default the maximum size of the uploaded file is 4 MB. If you try to upload a bigger file, you ll get a runtime error. To change this restriction, modify the maxRequestLength attribute of the <httpRuntime> setting in the application s web.config file. The size is specified in kilobytes, so <httpRuntime maxRequestLength="8192"/> sets the maximum file size to 8 MB.

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