MVVM框架-MVVMLight
2024-09-06 07:27:49
项目URL：http://www.mvvmlight.net/
一、安装MVVMLight
在NuGet程序包中搜索MVVMLight，然后安装。
二、使用
安装完MVVMLight后项目中会自动生成ViewModel目录，并且目录中会生成ViewModelLocator.cs文件
App.xaml会自动添加代码，注册全局变量Locator
<Application.Resources>
<ResourceDictionary>
<vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" xmlns:vm="clr-namespace:WpfTest.ViewModel" />
</ResourceDictionary>
</Application.Resources>
建立Model目录放置model类，View目录放置view类
在Model下添加PeopleModel.cs，继承ObservableObject类，ObservableObject实现了INotifyPropertyChanged接口，所有PeopleModel的属性改变可以通知控件绑定属性
public class PeopleModel : ObservableObject
{
private string name = "";
public string Name { get => name; set => Set(ref name, value); }
}
在ViewModel下添加PeopleViewModel.cs，继承ViewModelBase类，ViewModelBase类继承ObservableObject类
public class PeopleViewModel : ViewModelBase
{
private PeopleModel people = new PeopleModel();
public PeopleModel People { get => people; set => Set(ref people, value); }
//不带参数命令
public ICommand CmdUpdateName
{
get
{
return new RelayCommand(new Action(() =>
{
People.Name = "无参数";
}));
}
}
//带参数命令
public ICommand CmdUpdateName1
{
get
{
return new RelayCommand<object>(new Action<object>(t =>
{
People.Name = System.Convert.ToString(t);
}));
}
}
}
在ViewModelLocator.cs里注册PeopleViewModel元素
/// <summary>
/// This class contains static references to all the view models in the
/// application and provides an entry point for the bindings.
/// </summary>
public class ViewModelLocator
{
/// <summary>
/// Initializes a new instance of the ViewModelLocator class.
/// </summary>
public ViewModelLocator()
{
ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default); ////if (ViewModelBase.IsInDesignModeStatic)
////{
//// // Create design time view services and models
//// SimpleIoc.Default.Register<IDataService, DesignDataService>();
////}
////else
////{
//// // Create run time view services and models
//// SimpleIoc.Default.Register<IDataService, DataService>();
////} SimpleIoc.Default.Register<MainViewModel>();
SimpleIoc.Default.Register<PeopleViewModel>();
} public MainViewModel Main
{
get
{
return ServiceLocator.Current.GetInstance<MainViewModel>();
}
} public PeopleViewModel PeopleVM
{
get
{
return ServiceLocator.Current.GetInstance<PeopleViewModel>();
}
} public static void Cleanup()
{
// TODO Clear the ViewModels
}
}
在View目录下添加PeopleWindow窗体，并给window的DataContext属性绑定PeopleVM元素
<Window x:Class="WpfTest.View.PeopleWindow"
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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfTest.View"
mc:Ignorable="d"
Title="PeopleWindow" Height="450" Width="800"
DataContext="{Binding Source={StaticResource Locator}, Path=PeopleVM}">
<Grid>
<Button Command="{Binding CmdUpdateName}" Content="无参数" HorizontalAlignment="Left" Margin="10,31,0,0" VerticalAlignment="Top" Width="75"/>
<Button Command="{Binding CmdUpdateName1}" CommandParameter="有参数" Content="有参数" HorizontalAlignment="Left" Margin="10,69,0,0" VerticalAlignment="Top" Width="75"/>
<Label Content="{Binding People.Name}" HorizontalAlignment="Left" Margin="135,33,0,0" VerticalAlignment="Top" RenderTransformOrigin="-1.663,-1.363"/>
</Grid>
</Window>
界面效果：
（1）点击无参数按钮：
（2）点击有参数按钮
参考：
https://www.cnblogs.com/manupstairs/p/4890300.html 里面有对MVVMLight比较详细的解释
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