Initial commit: .NET practice project

Added CSharp, Nots, and Wpf directories with various practice exercises and projects.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Wpf/Prism1/ModuleA/ViewModels/CViewModel.cs

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+using System;
+using System.Windows;
+using ModuleA.Event;
+using Prism.Commands;
+using Prism.Events;
+using Prism.Services.Dialogs;
+
+namespace ModuleA.ViewModels;
+
+public class CViewModel : IDialogAware
+{
+    public DelegateCommand ConfirmCommand { get; set; }
+    public DelegateCommand CancelCommand { get; set; }
+
+    public CViewModel(IEventAggregator aggregator)
+    {
+        ConfirmCommand = new DelegateCommand(Confirm);
+        CancelCommand = new DelegateCommand(Cancel);
+        // 通过事件聚合器发布消息
+        var messageEvent = aggregator.GetEvent<MessageEvent>();
+        messageEvent.Publish("Hello World");
+    }
+
+    private void Cancel()
+    {
+        DialogParameters info = new DialogParameters();
+        info.Add("address", "Beijing");
+        RequestClose?.Invoke(new DialogResult(ButtonResult.No, info));
+    }
+
+    private void Confirm()
+    {
+        DialogParameters info = new DialogParameters();
+        info.Add("title", "标题");
+
+        RequestClose?.Invoke(new DialogResult(ButtonResult.OK, info));
+    }
+
+    /// <summary>
+    ///     能否展示
+    /// </summary>
+    /// <returns></returns>
+    public bool CanCloseDialog()
+    {
+        return true;
+    }
+
+    /// <summary>
+    ///     窗口关闭【这个函数是在 CanCloseDialog 触发后调用，此时 RequestClose 一直为 null】
+    /// </summary>
+    public void OnDialogClosed()
+    {
+
+    }
+
+    public void OnDialogOpened(IDialogParameters parameters)
+    {
+        parameters.TryGetValue("age", out int age);
+        Console.WriteLine(age);
+    }
+
+    public string Title { get; }
+    public event Action<IDialogResult>? RequestClose;
+}