问如何在c#应用程序中通过EF将存储过程生成为异步方法？

EN

public async virtual Task<int> InvokeAsync(Nullable<byte> first, string second)
{
   var firstParameter = first.HasValue ?
       new ObjectParameter("CrawlerID", first) :
       new ObjectParameter("CrawlerID", typeof(byte));

   var secondParameter = second != null ?
       new ObjectParameter("JsonData", second) :
       new ObjectParameter("JsonData", typeof(string));

return await ObjectContext.ExecuteFunctionAsync("GetInt", firstParameter, secondParameter);
}