MVVM - VM的集合 [英] MVVM - Collections of VMs

问题描述

我有一个相当典型的场景，即模型A有一组模型B.我还有两个模型的VM和A和VM B.问题是，如何在VM A中公开VM B的集合。我做了很多谷歌搜索，我发现
的最佳帖子是：
https://stackoverflow.com/questions/15830008/mvvm-and-collections-of-vms 看起来很有趣但是如何你真的使用它，特别是需要传递给构造函数的IViewModelProvider。

I have a rather typical scenario, i.e. a model A that has a collection of models B. I also have a VM A and VM B for the two models. The question is, how do I expose the collections of VM Bs in VM A. I did a lot of googling and the best post I found was this: https://stackoverflow.com/questions/15830008/mvvm-and-collections-of-vms That looks pretty interesting but how do you actually use this, in particular the IViewModelProvider that needs to be passed to the constructor.

我也对如何实现它的任何其他建议感兴趣。

I am also interested in any other suggestions how to implement this.

推荐答案

您好hfaun，

Hi hfaun,

>> 问题是，如何在VM A中公开VM B的集合。 

你呢想得到这个：

 //Course (Model)
    public class Course
    {
        public ObservableCollection<Student> Students { get; set; }
        //...
    }

    //Student (Model)
    public class Student
    {
        public string Name { get; set; }
        public int Grade { get; set; }
        //...
    }

    //StudentViewModel
    public class StudentViewModel
    {
        Student _model;

        public string Name
        {
            get { return _model.Name; }
            set
            {
                if (value == _model.Name) return;

                _model.Name = value;
                base.OnPropertyChanged("Name");
            }
        }
        //...
    }

    //CourseViewModel
    public class CourseViewModel
    {
        public ObservableCollection<StudentViewModel> Students { get; set; }
      
    }

最好的问候，

Cherry

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