[OPEN] [#946] DirectMethod with async await

[baruch.gabo]

I have a direct method that needs to retrieve information from several database tables before returning a result to the user. To improve performance we have implemented the data layer using the new async await functionality of .Net.
When using the data layer from within a DirectMethod we encountered one of two issues:

1. If we used the await by itself, the control returned to the DirectMethod invoke call and from there to the browser without the code getting a result. Which is expected since the DirectMethod Invoke code does not await a result from a task.
2. If we used the await with ConfigureAwait(false) option, the control waited until we got the result but HttpContext.Current becomes null, as well as Extnet.ResourceManager properties. Resulting in System.NullReferenceException

The following is a sample DirectMethod with a call to a delayed task to illustrate the first case:

[Ext.Net.DirectMethod]
public async Task<int> GetDmNumber(){
  try{
     var num = await GetNumberAsync();
     num +=10;
     return num;
  }
  catch(Excption ex){
    Ext.Net.ResourceManager.AjaxSuccess = false;
    Ext.Net.ResourceManager.AjaxErrorMessage = ex.Message;
  }
}
private async Task<int> GetNumberAsync(){
  await Task.Delay(1000);
   return 5;
}

The following is the code that wait for the return value from the async function but fails to maintain the HttpContext resulting in a NullReferenceException for the AjaxSuccess

[Ext.Net.DirectMethod]
public async Task<int> GetDmNumber(){
  try{
    var num = await GetNumberAsync().ConfigureAwait(false);
    num +=10;
    throw Exception("test exception");
    return num;
  }
  catch(Excption ex){
    Ext.Net.ResourceManager.AjaxSuccess = false;
    Ext.Net.ResourceManager.AjaxErrorMessage = ex.Message;
  }
}
private async Task<int> GetNumberAsync(){
  await Task.Delay(1000);
  return 5;
}

Is there a way to use async await in a DirectMethod that will work?