使用工厂内置的MVVMCross创建视图模型? [英] Create View Model using MVVMCross built in factory?

问题描述

我遇到一种情况，我想解析"视图模型而不必手动调用IoC容器来解析视图模型依赖项.

I have a situation where I want to "resolve" view models without having to manually call out to the IoC container to resolve a viewmodels dependencies.

我假设Mvvmcross内部具有一个视图模型工厂，用于在注入视图模型的依赖时创建视图模型.

I'm assuming that internally Mvvmcross has a viewmodel factory used to create viewmodels while injecting their dependencies.

我可以直接打电话吗?如果是这样，它叫什么名字，这些工厂位于什么命名空间中?

Can I call into that directly? If so, what is it called and what namespaces do these factories reside in?

基本上，我想做的是为tabcontroller创建一个"HomeViewModel"，但不想对每个"tabs"视图模型的依赖项解析进行硬编码.

Essentially what I'm trying to do is create a "HomeViewModel" for a tabcontroller but don't want to hardcode the dependency resolution for each "tabs" view model.

推荐答案

我个人要做的是在我的HomeViewModel中使用IoC来获取嵌套的ViewModel的所有依赖项，并在实例化时将它们传递给它们.他们.像这样的东西:

What I personally do is to use IoC in my HomeViewModel to get the all the dependencies of the nested ViewModels and pass them along when I instantiate them. So something in the likes of:

private ITwitterService _twitterService;
private IFacebookService _facebookService;
private IDataProcessingService _dataProcessingService;
private TwitterViewModel _twitterViewModel;
private FacebookViewModel _facebookViewModel;

public HomeViewModel(ITwitterService t, IFacebookService f, IDataProcessingService d)
{
    _twitterService = t;
    _facebookService = f;
    _dataProcessingService = d;
    _twitterViewModel = new TwitterViewModel(_twitterService, _dataProcessingService);
    _facebookViewModel = new FacebookViewModel(_facebookService, _dataProcessingService);
}

然后，我只需在选项卡中使用ViewModel的那些实例即可.

Then I simply use those instances of my ViewModels in my tabs.

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