C# ASP.NET core web api httprequestmessage rewrite

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C#

ASP.NET-Core

I am re-writing a POST method from ASP.NET Web API to ASP.NET Core I am not sure how to re-write the below code. This code works fine in ASP.NET Web API.

ASP.NET Web Api:

public IHttpActionResult Post()
{
    var rawds = ConvertByteToArray(Request.Content.ReadAsStreamAsync().Result); //error here at Content
    //do something
}

private byte[] ConvertByteToArray(Stream stream)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                stream.CopyTo(ms);
                return ms.ToArray();
            }
        }

What I have tried:

When I write the same code as below in ASP.NET Core I get the following error 'HttpRequest' does not contain a definition for 'Content' and no extension method 'Content' accepting a first argument of type 'HttpRequest' could be found (are you missing a using directive or an assembly reference?)

ASP.NET Core:

public IActionResult Post()
{
    var rawds = ConvertByteToArrayAsync(Request.Content.ReadAsStreamAsync().Result);
    //do something
} 

public static async Task<byte[]> ConvertByteToArrayAsync(Stream stream)
        {
            using (var ms = new MemoryStream(2048))
            {
                await request.Body.CopyToAsync(ms); //get error here at request
                return ms.ToArray();
            }
        }