MvvmCross：ShowViewModel是否总是构造新实例？

从不 – 对于新导航,默认行为始终是创建新实例.

如果出于某种原因想要覆盖viewmodel位置/创建,那么可以获得有关覆盖App.cs中的DefaultviewmodelLocator的信息：

> MVVMCross Passing values to ViewModel that has 2 constructors
> http://slodge.blogspot.co.uk/2013/01/navigating-between-viewmodels-by-more.html

简而言之,实现您的代码：

public class MyviewmodelLocator
  : MvxDefaultviewmodelLocator
{
    public override bool TryLoad(Type viewmodelType,IDictionary<String,String> parameterValueLookup,out IMvxviewmodel model)
    {
        // your implementation
    }
}

然后在App.cs中返回它：

protected override IMvxviewmodelLocator CreateDefaultviewmodelLocator()
{
    return new MyviewmodelLocator();
}

请注意,像How to replace MvxDefaultViewModelLocator in MVVMCross application这样的旧帖子仍然在概念上兼容 – 但这些旧帖子中的详细信息现已过时.