c# - How to take async result in getter?

I have a method in repository with this implementation which returns a Task

Task> GetAllAppsRequestAsync();

I write the getter which call this async method

public IList ApplicationsList
    {
        get
        {
            IList applicationDTO = _appService.GetAllAppsRequestAsync();
            if (applicationDTO != null)
            {
                applicationList = mapper.DefaultContext.Mapper.Map>(applicationDTO);
            }
            return applicationList;
        }
        set => Set(ref applicationList, value);
    }

_appService.GetAllAppsRequestAsync(); - return task, and proble that getter doesn't have async

I try to write delegate, i take the problem when i map the models.

I try to find something but whatever I do, I take deathlock or don't wait my task with result.(try getAwaiter, wait,some example with wrapping) and doesn't know what to do?

forget i try to it by this

public static void RunSync(Func func)
{
    AsyncHelper._myTaskFactory
      .StartNew(func)
      .Unwrap()
      .GetAwaiter()
      .GetResult();
}

but doesn't take the result, before project will finish

Node

I should use the property because it binding with with my itemControl in wpr xaml page.

Edit

private async Task> TakeAppListAsync()
    {
        IList applicationDTO = await _appService.GetAllAppsRequestAsync();
        if (applicationDTO != null)
        {
            applicationList = mapper.DefaultContext.Mapper.Map>(applicationDTO);
        }
        return applicationList;
    }