how to get file size of uploaded fiel in web api in .net core

Question

I want to get the file size of the uploaded file without saving it on the disk. I am getting the file in controller like this

public async Task<IActionResult> GetIncomingFile(IFormFile file){
 // my code here
}

Did you try to read `Content-Lenght` header? Does the request contain any other data except file? — Roman Marusyk, Jan 13 '23 at 16:14
Have you tried using [IFormFile.Length](https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.http.iformfile.length?view=aspnetcore-7.0#microsoft-aspnetcore-http-iformfile-length) ? — Panagiotis Kanavos, Jan 13 '23 at 16:15
This question might help https://stackoverflow.com/q/1380839/20654632 — , Jan 13 '23 at 16:15
The `Length` property maps to the `Content-Length` header. Did you use them? If you know about the `Length` property, why the question? Did you encounter another problem? — Panagiotis Kanavos, Jan 13 '23 at 16:16
@RomanMarusyk No, i am not using `FileInfo`. I am using `IFormFile` — Fahad Subzwari, Jan 13 '23 at 16:16
@PanagiotisKanavos i didn't know that .Length property gives the file actual file size. I am new to .net core and c# world. — Fahad Subzwari, Jan 13 '23 at 16:17

Roman Marusyk · Accepted Answer · 2023-01-13T16:22:13.990

2

You can use the Length property of the IFormFile object to get the file size. The Length property returns the size of the file in bytes.

Here is an example of how you can use it:

public async Task<IActionResult> GetIncomingFile(IFormFile file){
    long fileSize = file.Length;
    // Do something with the file size
    ...
}

edited Jan 13 '23 at 16:22

answered Jan 13 '23 at 16:17

Roman Marusyk

1 Answers1