Xamarin & MvvmCross Handbook
Xamarin & MvvmCross Handbook
GitHub repo for the demo
GitHub repo for this book
Introduction
Using MvvmCross to create your first Xamarin App
Creating the Core project
Creating the Android project
Creating the iOS project
Creating the UWP project
Creating the REST API Service
Navigation
Creating the PostDetail View & ViewModel
Command with the parameter
Retrieving the param from the previous ViewModel
Understanding the IMvxNavigationService
Responding the events from different controls in the ListView
Retrieving the return result from the previous ViewModel
Creating the Xamarin.Forms project
Summary
Implementing MasterDetail layout in Xamarin.Forms by MvvmCross
Introduction
Creating the project by MvxScaffolding
Creating the MasterDetailPage
Creating the MasterPage
Creating the DetailPages
Implementing the Menu functionalities
Fine-tuning the UI
Summary
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Creating the PostDetail View & ViewModel

I will not post all the codes here and you can get the codes from the GitHub repo: https://github.com/yanxiaodi/MvvmCrossDemo. I also created a new Comment model, a service interface and the implementation for comments. Now look at the codes in the PostDetailViewModel:

namespace MvvmCrossDemo.Core.ViewModels
{
    public class PostDetailViewModel : MvxViewModel
    {
        private readonly IPostService _postService;
​
        public PostDetailViewModel(IPostService postService)
        {
            _postService = postService;
        }
​
        public override void Prepare()
        {
            // This is the first method to be called after construction
            CommentList = new MvxObservableCollection<Comment>();
​
        }
​
        public override async Task Initialize()
        {
            // Async initialization, YEY!
​
            await base.Initialize();
        }
​
​
        #region Post;
        private Post _post;
        public Post Post
        {
            get => _post;
            set => SetProperty(ref _post, value);
        }
        #endregion
​
        #region CommentList;
        private MvxObservableCollection<Comment> _commentList;
        public MvxObservableCollection<Comment> CommentList
        {
            get => _commentList;
            set => SetProperty(ref _commentList, value);
        }
        #endregion
​
        private async Task GetPost(int postId)
        {
            var response = await _postService.GetPost(postId);
            if (response.IsSuccess)
            {
                Post = response.Result;
            }
        }
​
        private async Task TaskGetComments(int postId)
        {
            var response = await _postService.GetComments(postId);
            if (response.IsSuccess)
            {
                CommentList.AddRange(response.Result);
            }
        }
    }
}

In this ViewModel, we have to get the postId from the previous view for the data initialization. But how to pass the param to the PostDetailViewModel?

Using MvvmCross to create your first Xamarin App - Previous
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Command with the parameter
Last updated 2 years ago