Returning a binary respose in ASP MVC RC3

In a previous post I showed how to return a binary file from a controller action, well, this no longer works in release candidate 3 of the framework. Instead you have to create a new ActionResult descendant to do the job for you. This is how I did it....

return new BinaryResult(data, Path.GetFileName(productFileName));

and the class is implemented like so:

public class BinaryResult : ActionResult
{
  private string ClientFileName;
  private byte[] Data;
  private string VirtualFileName;

  public BinaryResult(string virtualFileName, string clientFileName)
  {
    if (string.IsNullOrEmpty(virtualFileName))
      throw new ArgumentNullException("VirtualFileName");
    if (string.IsNullOrEmpty(clientFileName))
      throw new ArgumentNullException("ClientFileName");

    ClientFileName = clientFileName;
    VirtualFileName = virtualFileName;
  }

  public BinaryResult(byte[] data, string clientFileName)
  {
    if (data == null)
      throw new ArgumentNullException("Data");
    if (string.IsNullOrEmpty(clientFileName))
      throw new ArgumentNullException("ClientFileName");

    ClientFileName = clientFileName;
    Data = data;
  }

  public override void ExecuteResult(ControllerContext context)
  {
    if (!string.IsNullOrEmpty(VirtualFileName))
    {
      string localFileName = context.HttpContext.Server.MapPath(VirtualFileName);
      FileStream fileStream = new FileStream(localFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
      using (fileStream)
      {
        Data = new byte[fileStream.Length];
        fileStream.Read(Data, 0, (int)fileStream.Length);
      }//using fileStream
    }

    context.HttpContext.Response.AddHeader("content-disposition", "attachment; filename=" + ClientFileName);
    context.HttpContext.Response.BinaryWrite(Data);
  }
}