棱镜 BindableBase.SetProperty() [英] Prism BindableBase.SetProperty()

问题描述

我正在开发基于 BindableBase 的 ViewModel.这个 VM 拥有一个域模型的实例.VM 公开了一个属性，比如 Name，我不想使用本地存储(即 VM 中的存储)，而是委托给模型对象的属性.我想使用 SetProperty()，但存储引用不能是属性.我是否必须实现 INotifyPropertyChanged my self ?以这种方式委托给模型是一个好主意吗?是否可以扩展 BindableBase(或要添加的团队)来解决这个问题?

I am developing a ViewModel based on BindableBase. This VM holds an instance of a domain model. The VM exposes a property, say Name from which I want to not use local storage (i.e. storage in VM), but rather delegate to the model object's property. I would like to use SetProperty(), but the storage reference cannot be a property. Do I have to implement INotifyPropertyChanged my self ? Is it at all a good idea to delegate to the model this way ? Would it be possible to extend BindableBase (or team to add) to cover for this ?

推荐答案

因此，首先您必须选择构建 VM 和模型的方式.正如您所提到的，有几个选项.我推荐的最简单和最简单的方法是将您的模型作为属性公开，然后将您的视图绑定到模型属性:

So first you must chose how you will architect your VMs and Models. As you mentioned, there are a few options. The easiest and the way I recommend, is to just expose your Model as a property and then bind your View to the model properties:

public class MyViewModel : BindableBase
{
    private Person _myPerson;
    public Person Person
    {
        get { return _myPerson; }
        set { SetProperty(ref _myPerson, value); }
    } 
}

如果您不想这样做，而是想包装每个单独的模型属性，您可以这样做.

If you don't want to do that and would rather wrap each individual model property, you would do it like this.

public class MyViewModel : BindableBase
{
    private Person _myPerson;

    private string _name;
    public string Name
    {
        get { return _myPerson.Name; }
        set { _myPerson.Name = value }
    } 
}

请记住，您的 Person 模型对象仍然需要实现 INPC.

Keep in mind, your Person model object still has to implement INPC.

如果您无法控制您的模型并需要它们来实现 INPC，您可以尝试使用 IL 编织，或为您的模型创建一个外观/装饰器并单独包装它们.

If you don't have control over your models and need them to implement INPC, you could try to use IL weaving, or create a façade/decorator for your models and wrap them individually.

public class MyPersonFacade : BindableBase
{
    private Person _myPerson;

    private string _name;
    public string Name
    {
        get { return _myPerson.Name; }
        set 
        {
            _myPerson.Name = value;
            OnPropertyChanged();
        }
    } 
}

然后将其用作 VM 中的模型.

Then use this as your Model in your VM.

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