MVVMLight 中一个 View 对应多的 ViewModel，和一个 View 对应 一个ViewModel

Posted 2021-08-17 君子务本，本利而道生

在MvvmLight中View和ViewModel的绑定

View Model

public class Test1ViewModel : ViewModelBase {
	public List<string> Name = new  List<string> (){"amos","kai","name"};
	...
}
public class Test2ViewModel : ViewModelBase {
	public List<string> Name1 = new  List<string> (){"amos1","kai1","name1"};
	...
}
public class Test3ViewModel : ViewModelBase {
	public List<string> Name2 = new  List<string> (){"amos2","kai2","name2"};
	...
}

app.xml中

<Application.Resources>
    <ResourceDictionary>
        <vms:ViewModelLocator x:Key="Locator" />
    </ResourceDictionary>
</Application.Resources>

在ViewModelLocator中配置ViewModel。

public class ViewModelLocator{
	public ViewModelLocator(){
		ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
		SimpleIoc.Default.Register<Test1ViewModel>();
		SimpleIoc.Default.Register<Test2ViewModel>();
		SimpleIoc.Default.Register<Test3ViewModel>();
	}

	public Test1ViewModel  Test1 {
		get{
			return ServiceLocator.Current.GetInstance<Test1ViewModel>();
		}
	}
	public Test2ViewModel  Test2 {
		get{
			return ServiceLocator.Current.GetInstance<Test2ViewModel>();
		}
	}
	public Test3ViewModel  Test3 {
		get{
			return ServiceLocator.Current.GetInstance<Test3ViewModel>();
		}
	}
}

<Window
    x:Class="Wisdy.DSP.Client.FormulaContentEdit"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:Wisdy.DSP.Client"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    DataContext="{Binding Source={StaticResource Locator}, Path=OffLine}"
    mc:Ignorable="d">

1.一个ViewModel对应一个View

DataContext="{Binding Source={StaticResource Locator}, Path=Test1}"

当配置一个viewmodel的时候,直接配置Path=Test1,就可以在xaml中绑定viewmodel中的数据了。
如：

 <ListBox ItemsSource="{Binding Name}"/>

1.多个ViewModel对应一个View

DataContext="{Binding Source={StaticResource Locator}}"

当配置多个viewmodel的时候,就不配置Path,但是在xaml中绑定viewmodel中的数据需要调用。

如：

 <ListBox ItemsSource="{Binding Test1.Name}"/>
 <ListBox ItemsSource="{Binding Test2.Name}"/>
 <ListBox ItemsSource="{Binding Test3.Name}"/>