MVVMcross upgrade from 4 to 6.2.1 getting error Mvx does not contain definition of Close Trace Error , warning etc

Question

after upgrade on mvvmcross 6.2.1 getting error Mvx does not contain definition of Traces , Warning , Error, etc

Answer 1

A lot have changed since Mvx 4. You should read the documentation, blogs and migration guides (from 4 to 5, from 5 to 6).

About traces, warning, error, now Mvx has a new way you can do Diagnostic & Logging. You have to inject/resolve IMvxLog and there you will have all the methods to do trace, warning, error, etc.

public class MyViewModel : MvxViewModel
{
    private readonly IMvxLog _log;
    public MyViewModel(IMvxLog log)
    {
        _log = log;
    }

    private void SomeMethod()
    {
        _log.Trace("Some message");
    }
}

In order to close a viewmodel you need to use the new Navigation system:

public class MyViewModel : MvxViewModel
{
    private readonly IMvxNavigationService _navigationService;
    public MyViewModel(IMvxNavigationService navigation)
    {
        _navigationService = navigationService;
    }

    public override void Prepare()
    {
        // first callback. Initialize parameter-agnostic stuff here
    }

    public override async Task Initialize()
    {
        await base.Initialize();

        // do the heavy work here
    }

    public async Task SomeMethod()
    {
        var result = await _navigationService.Navigate<NextViewModel, MyObject, MyReturnObject>(new MyObject());
        //Do something with the result MyReturnObject that you get back
    }
}

public class NextViewModel : MvxViewModel<MyObject, MyReturnObject>
{
    private readonly IMvxNavigationService _navigationService;

    private MyObject _myObject;

    public MyViewModel(IMvxNavigationService navigation)
    {
        _navigationService = navigationService;
    }

    public override void Prepare()
    {
        // first callback. Initialize parameter-agnostic stuff here
    }

    public override void Prepare(MyObject parameter)
    {
        // receive and store the parameter here
        _myObject = parameter;
    }

    public override async Task Initialize()
    {
        //Do heavy work and data loading here
    }

    public async Task SomeMethodToClose()
    {
        await _navigationService.Close(this, new MyReturnObject());
    }
}

If you want to return nothing just do _navigationService.Close(this) (of course you have to remove the generic type parameter of MyReturnObject in order to do so) and that's it.

HIH