MVVM框架-MVVMLight

一、安装MVVMLight
二、使用

项目URL：http://www.mvvmlight.net/

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一、安装MVVMLight

在NuGet程序包中搜索MVVMLight，然后安装。

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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>