initial

.gitignore

@@ -0,0 +1,9 @@
+.vs/
+bin/
+obj/
+*.user
+.idea/
+
+packages/
+
+.DS_Store

MVVMDemo.CommunityToolKit.Mvvm/App.xaml

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+<Application x:Class="MVVMDemo.CommunityToolKit.Mvvm.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MVVMDemo.CommunityToolKit.Mvvm"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

MVVMDemo.CommunityToolKit.Mvvm/App.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace MVVMDemo.CommunityToolKit.Mvvm
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

MVVMDemo.CommunityToolKit.Mvvm/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

MVVMDemo.CommunityToolKit.Mvvm/MVVMDemo.CommunityToolKit.Mvvm.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
+  </ItemGroup>
+
+</Project>

MVVMDemo.CommunityToolKit.Mvvm/MainViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Input;
+
+namespace MVVMDemo.CommunityToolKit.Mvvm
+{
+    /// <summary>
+    /// 使用分布类 partial  继承ObservableObject
+    /// 就不用写ViewModelBase RelayCommand了
+    /// </summary>
+    public partial class MainViewModel : ObservableObject
+    {
+        [ObservableProperty]
+        [NotifyCanExecuteChangedFor(nameof(BtnCommand))]
+        private string textContent = "Default Content through CommunityToolkit.Mvvm";
+
+        private bool CanExecuteBtn() => !string.IsNullOrEmpty(TextContent);
+
+
+        [RelayCommand(CanExecute = nameof(CanExecuteBtn))]
+        private void Btn(object o)
+        {
+            // 获取CommandParameter绑定对象
+            //var view = o as Window;//因为MainWindow继承自Window，所以可以这么写
+            var view = o as MainWindow;
+            //举个例子： 点击就最大化窗口
+            if (view != null)
+                view.WindowState = WindowState.Maximized;
+
+            TextContent = "Default Content";
+        }
+    }
+}

MVVMDemo.CommunityToolKit.Mvvm/MainWindow.xaml

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+<Window x:Class="MVVMDemo.CommunityToolKit.Mvvm.MainWindow"
+        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:MVVMDemo.CommunityToolKit.Mvvm"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.DataContext>
+        <!--// 有很多中绑定方式，这里选择了UI代码中绑定//-->
+        <local:MainViewModel />
+    </Window.DataContext>
+    <Grid>
+        <StackPanel Orientation="Vertical"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center">
+            <StackPanel Orientation="Horizontal"
+                        Margin="2">
+                <Label Content="Origin Content: "
+                       FontSize="20"
+                       VerticalAlignment="Center"
+                       HorizontalAlignment="Center" />
+
+                <TextBox Text="{Binding TextContent, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                         TextWrapping="Wrap"
+                         MinWidth="400"
+                         MaxWidth="600"
+                         FontSize="20"
+                         Padding="4"/>
+            </StackPanel>
+
+            <StackPanel Orientation="Horizontal"
+                        Margin="2">
+                <Label Content="Sync Content:    "
+                       FontSize="20"
+                       VerticalAlignment="Center"
+                       HorizontalAlignment="Center" />
+
+                <TextBlock Text="{Binding TextContent}"
+                           TextWrapping="Wrap"
+                           MinWidth="400"
+                           MaxWidth="600"
+                           FontSize="20"
+                           Padding="4"/>
+            </StackPanel>
+
+            <!--// CommandParameter: 绑定对象到BtnCmd上 //-->
+            <Button Content="Reset"
+                    Command="{Binding BtnCommand}"
+                    CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=Window}}"
+                    FontSize="30" />
+        </StackPanel>
+    </Grid>
+</Window>

MVVMDemo.CommunityToolKit.Mvvm/MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace MVVMDemo.CommunityToolKit.Mvvm
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

MVVMDemo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33829.357
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MVVMDemo", "MVVMDemo\MVVMDemo.csproj", "{02775190-3409-4FBE-8B19-D44AFB27487C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MVVMDemo.CommunityToolKit.Mvvm", "MVVMDemo.CommunityToolKit.Mvvm\MVVMDemo.CommunityToolKit.Mvvm.csproj", "{5F94EC8F-DEF3-4F50-87FB-72F76DFDF4AC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{02775190-3409-4FBE-8B19-D44AFB27487C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{02775190-3409-4FBE-8B19-D44AFB27487C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{02775190-3409-4FBE-8B19-D44AFB27487C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{02775190-3409-4FBE-8B19-D44AFB27487C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5F94EC8F-DEF3-4F50-87FB-72F76DFDF4AC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5F94EC8F-DEF3-4F50-87FB-72F76DFDF4AC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5F94EC8F-DEF3-4F50-87FB-72F76DFDF4AC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5F94EC8F-DEF3-4F50-87FB-72F76DFDF4AC}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D91EF1E3-1DF4-4E1E-9C3D-41D340EAC84A}
+	EndGlobalSection
+EndGlobal

MVVMDemo/App.xaml

@@ -0,0 +1,9 @@
+<Application x:Class="MVVMDemo.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MVVMDemo"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

MVVMDemo/App.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace MVVMDemo
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

MVVMDemo/AssemblyInfo.cs

@@ -0,0 +1,10 @@
+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

MVVMDemo/BaseViewModel.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MVVMDemo
+{
+    public class BaseViewModel : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        /// <summary>
+        /// 更新方式，其实只要下面的就行，在这边封装一层，更方便
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="properValue"></param>
+        /// <param name="newValue"></param>
+        /// <param name="properName"></param>
+        protected void UpdateProperty<T>(ref T properValue, T newValue, [CallerMemberName] string properName = "")
+        {
+            //对比新旧值，如果相等就不更新
+            if (object.Equals(properValue, newValue))
+                return;
+            properValue = newValue;
+            NotifyPropertyChanged(properName);
+        }
+
+        /// <summary>
+        /// 最基础的方式
+        /// </summary>
+        /// <param name="propertyName"></param>
+        //public void NotifyPropertyChanged([CallerMemberName] string propertyName = null)//参数加上此标记就可以不用传递参数了
+        public void NotifyPropertyChanged(string propertyName)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}

MVVMDemo/MVVMDemo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>

MVVMDemo/MainViewModel.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Input;
+
+namespace MVVMDemo
+{
+    public class MainViewModel : BaseViewModel
+    {
+        private string _textContent = "Default Content";
+        public string TextContent { get => _textContent; set => UpdateProperty(ref _textContent, value); }
+
+        public ICommand BtnCmd { get; private set; }
+
+        public MainViewModel()
+        {
+            BtnCmd = new RelayCommand((_) =>
+            {
+                //这个就是控制是否启用的条件
+                return string.IsNullOrEmpty(TextContent);
+            }, (o) =>
+            {
+                // 获取CommandParameter绑定对象
+                //var view = o as Window;//因为MainWindow继承自Window，所以可以这么写
+                var view = o as MainWindow;
+                //举个例子： 点击就最大化窗口
+                if (view != null)
+                    view.WindowState = WindowState.Maximized;
+
+                TextContent = "Default Content";
+            });
+        }
+    }
+}

MVVMDemo/MainWindow.xaml

@@ -0,0 +1,54 @@
+<Window x:Class="MVVMDemo.MainWindow"
+        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:MVVMDemo"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.DataContext>
+        <!--// 有很多中绑定方式，这里选择了UI代码中绑定//-->
+        <local:MainViewModel />
+    </Window.DataContext>
+    <Grid>
+        <StackPanel Orientation="Vertical"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center">
+            <StackPanel Orientation="Horizontal"
+                        Margin="2">
+                <Label Content="Origin Content: "
+                       FontSize="20"
+                       VerticalAlignment="Center"
+                       HorizontalAlignment="Center" />
+                
+                <TextBox Text="{Binding TextContent, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                         TextWrapping="Wrap"
+                         MinWidth="400"
+                         MaxWidth="600"
+                         FontSize="20"
+                         Padding="4"/>
+            </StackPanel>
+            
+            <StackPanel Orientation="Horizontal"
+                        Margin="2">
+                <Label Content="Sync Content:    "
+                       FontSize="20"
+                       VerticalAlignment="Center"
+                       HorizontalAlignment="Center" />
+
+                <TextBlock Text="{Binding TextContent}"
+                           TextWrapping="Wrap"
+                           MinWidth="400"
+                           MaxWidth="600"
+                           FontSize="20"
+                           Padding="4"/>
+            </StackPanel>
+
+            <!--// CommandParameter: 绑定对象到BtnCmd上 //-->
+            <Button Content="Reset"
+                    Command="{Binding BtnCmd}"
+                    CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=Window}}"
+                    FontSize="30" />
+        </StackPanel>
+    </Grid>
+</Window>

MVVMDemo/MainWindow.xaml.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace MVVMDemo
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

MVVMDemo/RelayCommand.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace MVVMDemo
+{
+    // 这个RelayCommand只要继承了ICommand，实现接口就可以了
+    // 至于你怎么定义构造，怎么实现，都是你自己的事情
+    public class RelayCommand : ICommand
+    {
+        private readonly Predicate<object> _canExecute;
+        private readonly Action<object> _execute;
+
+        public RelayCommand(Predicate<object> canExecute, Action<object> execute)
+        {
+            this._canExecute = canExecute;
+            this._execute = execute;
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            return _canExecute(parameter);
+        }
+
+        public void Execute(object parameter)
+        {
+            _execute(parameter);
+        }
+    }
+}