C#: how to use Async task in sync environment?

I'm facing a problem as below:

• I need to implement a traditional interface which will be called in a sync environment:

  
  
  

  public interface IWorker {
      int GetResult();
  }
  





• I need to use a third party lib which uses async/await

  
  
  

  Task ThirdPartyClass.WorkAsync();
  

How can I use the async method

    public class MyWorker : IWorker {
          public int GetResult()

          {
               // ??? how to use the async calls ???
               new ThirdPartyClass().WorkAsync();
          }
    }

I know there is a Result property, like int result = c.WorkAsync().Result;, but as far as I know it blocks the current thread and may cause dead locks. For example, calling an async method and use Result in a Winforms button event handler can cause dead lock problem.

Is there a better way to use async/await for such situation?