捕获来自另一个Task方法的特定异常

我有这2个方法，我知道肯定DoSomethingAsync返回FormatException。但是它总是在最后一个catch " Exception "

为什么CallSomethingAsync永远不会捕获FormatException?

       public Task DoSomethingAsync()
       {
            //Do something that throws a FormatException 
            return Task.FromResult(0);           
       }
   public virtual string CallSomethingAsync()
   {
        try
        {
            this.DoSomethingAsync().Wait();
            return “Ok”;
        }
        catch (FormatException)
        {
            return “FormatException”;
        }
        catch (Exception)
        {
            return “GeneralException”;
        }
   }