c# - Operator ! cannot be applied to operand of type Task<bool>

Question

I have following implementation and added a Async Task<bool> operation in the ChangeDate() method, previously it was just bool.

In the following line if (!ChangeDate())

Operator ! cannot be applied to operand of type Task

 public DateTime Date
 {
    get { return _date; }
    set
    {
      if (!ChangeDate())
      {
         return;
      }

      _date = value.Date;

    }
} 

private async Task<bool> ChangeDate()
{
  if (IsSave)
  {
     await Mvx.Resolve<IUserDialogs>().ConfirmAsync(new ConfirmConfig
     {
        Message = "Are you sure ?",
        OnConfirm = b =>
        {
            if (b)
            {
              Save();
            }
         }
      });
   }
   return true;
 }

Answer 1

Found this answer: How to make an Asynchronous Method return a value?

You'll need to make an async helper method, and call that instead of calling just your setter, because as @Ron Beyer points out, the await call will not work in a property.

Replace:

if(!ChangeDate())

With:

if( !(await ChangeDate()) )