我有一个源自import React,{Component} from 'react';
import Blog from './Blog'
class App extends Component {
render() {
return (
<div classname="container">
<Blog/>
</div>
);
}
}
export default App ;
的ViewModel，它使用合成来重用其他类：
我想在合成中重用的类的简化版本：
MvvmLight.ViewModelBase从MvvmLight ViewModelBase派生的我的ViewModel是这两个的组合：
class TimeFrameFactory
{
public DateTime SelectedTime {get; set;}
public ITimeFrame CreateTimeFrame() {...}
}
class GraphFactory
{
public int GraphWidth {get; set;}
public IGraph CreateGraph(ITimeframe timeframe) {...}
}
使用字段获取/设置有效，但是如果我想将属性设置为复合对象，则不能使用class MyViewModel : ViewModelBase
{
private readonly TimeFrameFactory timeFrameFactory = new TimeFrameFactory();
private readonly GraphFactory graphFactory = new GraphFactory();
private Graph graph;
// standard MVVM light method to get/set a field:
public Graph Graph
{
get => this.Graph;
private set => base.Set(nameof(Graph),ref graph,value);
}
// this one doesn't compile:
public DateTime SelectedTime
{
get => this.timeFrameFactory.SelectedTime;
set => base.Set(nameof(SelectedTime),ref timeFrameFactory.SelectedTime,value);
}
// this one doesn't compile:
public int GraphWidth
{
get => this.timeFrameFactory.GraphWidth;
set => base.Set(nameof(GraphWidth),ref timeFrameFactory.GraphWidth,value);
}
public void CreateGraph()
{
ITimeFrame timeFrame = this.timeFrameFactory.CreateTimeFrame();
this.Graph = this.GraphFactory.CreateGraph(timeFrame);
}
}
base.Set在属性上不允许使用引用。
我当然可以写：
set => base.Set(nameof(GraphWidth),value);
如果必须对许多属性执行此操作，则很麻烦。有没有一种整洁的方式可以做到这一点，可能类似于 public int GraphWidth
{
get => this.timeFrameFactory.GraphWidth;
set
{
base.RaisePropertyChanging(nameof(GraphWidh));
base.Set(nameof(GraphWidth),value);
base.RaisePropertyChanged(nameof(GraphWidh));
}
}
？