Get content length of incoming HttpListenerRequest input stream-CodePudding

I am making a server using C#'s HttpListner, and the server is handling incoming binary data from incoming post requests. I am trying to make the post request handler, and because I am handling binary data I am using byte[] (which is the buffer I am reading to). But the issue is I have to supply the length of the buffer before reading anything to the buffer. I tried HttpListnerRequest.InputStream.Length, but it throws this:

System.NotSupportedException: This stream does not support seek operations.

Is there another way to get the length of the stream? Other answers to similar questions just use StreamReader, but StreamReader does not do binary.

Here is my code that throws the error.

// If the request is a post request and the request has a body
Stream input = request.InputStream; // "request" in this case is the HttpListnerRequest
byte[] buffer = new byte[input.Length]; // Throws System.NotSupportedException.
input.Read(buffer, 0, input.Length);

CodePudding user response：

You can use HttpListnerRequest.ContentLength64, which represents the length of the request body, which in this case is the input stream. Example:

// If the request is a post request and the request has a body
long longLength = request.ContentLength64;
int length = (int) longLength;
Stream input = request.InputStream; // "request" in this case is the HttpListnerRequest
byte[] buffer = new byte[length];
input.Read(buffer, 0, length);