How to use IRequiresRequestStream on a Portable Class Library

ServiceStack
1

Good afternoon.
I need to use the IRequiresRequestStream interface to transfer huge files from my front end (WPF Application) to my Service using a PCL DLL. My goal is to create a base class, let’s call it TransferProxy who is in charge of the creation of the HttpWebRequest and execute all the stuff.

        string filePath = @"D:\MyFile.zip";
        HttpWebRequest client =(HttpWebRequest)WebRequest.Create(@"http://localhost:9056/upload/myfile.zip");
        client.Method = WebRequestMethods.Http.Post;

        // the following 4 rows enable streaming 
        client.AllowWriteStreamBuffering = false;
        client.SendChunked = true;
        client.ContentType = "multipart/form-data;";
        client.Timeout = int.MaxValue;

        using (FileStream fileStream = File.OpenRead(filePath))
        {
            fileStream.Copy(client.GetRequestStream());
        }

where “Copy(client.GetRequestStream());” is

public static class StreamExtender
{
    public static void Copy(this Stream instance, Stream target)
    {
        int bytesRead = 0;
        int bufSize = copyBuf.Length;

        while ((bytesRead = instance.Read(copyBuf, 0, bufSize)) > 0)
        {
            target.Write(copyBuf, 0, bytesRead);
        }
    }
    private static readonly byte[] copyBuf = new byte[0x1000];
}

The server side code is the following

public class UploadService : ServiceStack.Service
{
    public object Post(UploadPackage request)
    {
        // hack - get the properties from the request
        if (string.IsNullOrEmpty(request.FileName))
        {
            var segments = base.Request.PathInfo.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
            request.FileName = segments[1];
        }

        string resultFile = Path.Combine(@"C:\Temp", request.FileName);
        if (File.Exists(resultFile))
        {
            File.Delete(resultFile);
        }
        using (FileStream file = File.Create(resultFile))
        {
            request.RequestStream.Copy(file);
        }
        
        return new HttpResult(System.Net.HttpStatusCode.OK);
    }
}

The route is

[Route("/upload/{FileName}", "POST")]
public class UploadPackage : IRequiresRequestStream
{
    public System.IO.Stream RequestStream { get; set; }

    public string FileName { get; set; }
}

This code works like a charm if the TransferProxy is inside a Class Library, but when I try to move it in a Portable Class Library some properties of the HttpWebRequest are missing and, obviously, the FileStream is missing. Can you please give some tips on how I can implement what I need (if possible…)?

Thanks
Enrico

2

You can’t use any HttpRequest or File classes in a PCL as they’re not portable, you can pretty much only deal with Streams. Don’t try force the use of IRequiresRequestStream which is a server-side concept, use your own interface around streams if you need one.

3

I’m creating a new DLL (not portable) to use for this kind of operation.
Thank you very much
Enrico