Simple file upload in asp

CreateDirectory path ;. GetFileName postedFile. FileName ;. Related Articles. Add Comments. Thank you for the feedback. The comment is now awaiting moderation. You will be notified via email when the author replies to your comment. Please select a comment to reply. You can add your comment about this article using the form below.

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Inside the action method, the IFormFile contents are accessible as a Stream. In addition to the local file system, files can be saved to a network share or to a file storage service, such as Azure Blob storage. GetTempFileName throws an IOException if more than 65, files are created without deleting previous temporary files.

The limit of 65, files is a per-server limit. For more information on this limit on Windows OS, see the remarks in the following topics:. To store binary file data in a database using Entity Framework , define a Byte array property on the entity:. Specify a page model property for the class that includes an IFormFile :. IFormFile can be used directly as an action method parameter or as a bound model property. The prior example uses a bound model property.

Use caution when storing binary data in relational databases, as it can adversely impact performance. The examples provided don't take into account security considerations.

The 3. The file's antiforgery token is generated using a custom filter attribute and passed to the client HTTP headers instead of in the request body. Because the action method processes the uploaded data directly, form model binding is disabled by another custom filter. Within the action, the form's contents are read using a MultipartReader , which reads each individual MultipartSection , processing the file or storing the contents as appropriate. After the multipart sections are read, the action performs its own model binding.

The initial page response loads the form and saves an antiforgery token in a cookie via the GenerateAntiforgeryTokenCookieAttribute attribute. The attribute uses ASP.

NET Core's built-in antiforgery support to set a cookie with a request token:. ConfigureServices using Razor Pages conventions :. Since model binding doesn't read the form, parameters that are bound from the form don't bind query, route, and header continue to work. The action method works directly with the Request property. A MultipartReader is used to read each section. After the multipart sections are read, the contents of the KeyValueAccumulator are used to bind the form data to a model type.

The complete StreamingController. UploadDatabase method for streaming to a database with EF Core:. UploadPhysical method for streaming to a physical location:. In the sample app, validation checks are handled by FileHelpers. The sample app's FileHelpers class demonstrates a several checks for buffered IFormFile and streamed file uploads. For processing streamed files, see the ProcessStreamedFile method in the same file. The validation processing methods demonstrated in the sample app don't scan the content of uploaded files.

Although the topic sample provides a working example of validation techniques, don't implement the FileHelpers class in a production app unless you:. Never indiscriminately implement security code in an app without addressing these requirements. Scanning files is demanding on server resources in high volume scenarios. If request processing performance is diminished due to file scanning, consider offloading the scanning work to a background service , possibly a service running on a server different from the app's server.

Typically, uploaded files are held in a quarantined area until the background virus scanner checks them. When a file passes, the file is moved to the normal file storage location. These steps are usually performed in conjunction with a database record that indicates the scanning status of a file. Collectives on Stack Overflow. Learn more. How to upload files with asp-classic Ask Question.

Asked 9 years, 4 months ago. Active 3 years, 10 months ago. Viewed 89k times. I want to create a page with asp-classic where users can upload files or zipped folders. Add a comment. Active Oldest Votes. Fields "file". BinaryRead mlngBytesReceived End Sub ' Private Sub ParseDelimiter ' Delimiter seperates multiple pieces of form data ' "around" 43 characters in length ' next character afterwards is carriage return except last line has two -- ' first part of delmiter is dashes followed by hex number ' hex number is possibly the browsers session id?

End ' ' Example: ' Page finnishes executing Stream" ' Let stream know we are working with binary data lobjStream. Write lbinBytes ' Save the binary data to file system ' Overwrites file if previously exists! Call lobjStream. Recordset" ' create field in an empty recordset to hold binary data Call lobjRs. Open ' Add a new record to recordset Call lobjRs.

AddNew ' Populate field with binary data Call lobjRs. Fields "BinaryData". First, we are specifying folder path, then checking if folder exists or not, if not, create the folder.

Then take file from FileUpload control and then save it in the specified folder path, and show updated text message to user that file is uploaded using Label control. In the above image, file is uploaded as you see in the "Upload" folder of the project also. File Upload in ASP. Using Chart in ASP.