Partial View error HttpServerUtility.Execute blocked while waiting for an asynchronous operation to complete

Question

My application is running on MVC 5 . Recently I upgraded the Npgsql nuget package version and after that started getting below error in the application.

**Error :- ** HttpServerUtility.Execute blocked while waiting for an asynchronous operation to complete with partail view. Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.

Below is the code samples used in the application.

Cshtml page :-

Html.RenderAction("GetData", "ControllerName")

Controller :- Action method is having async and await

public async Task<ActionResult> GetData()
{           
   var data =  await _service.Data();
   return View("Data", data );
}

This code was running fine but getting these exceptions after upgrading the Npgsql version.

I have tried making action method synchronous by removing the async and used .Result instead of await but execution is stuck on _service.Data().Result .

public ActionResult GetData()
{           
   var data =  _service.Data().Result;
   return View("Data", data );
}

Answer 1

ASP.NET (pre-Core) does not support asynchronous child actions. There is no workaround. To solve this, you'll need to either:

• Upgrade to ASP.NET Core.
• Make your child action synchronous.