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c#asp.net-coreuploadmime-typesasp.net-core-2.2

Limit size of uploaded file in C# REST API

I have this code to upload an image file in my c# restful api :

using(Streamer reader = new StreamerReader(req.Bindfile().Result.OpenReadStream())) {
    request.Data.Image = Encoding.ASCII.GetBytes(reader.ReadToEnd());
}

I know I am slurping the file in one shot, but I would like to know the "right way" to modify this code so it rejects a file when it is bigger than 10 Megabytes.

I am inspecting the methods of reader instance and I cannot find anything useful other than read the file by blocks and just keep track of how many bytes I have read until that point.

Is that correct? Can someone help me to do this the C# way?

Solution

  • You can check the amount of bytes present in the stream and convert them to MB like so: amountOfBytes / (1024 * 1024f). You can then check if the amount is above your threshold, in your case 10, and take action accordingly.