添加Avalonia项目的demo

Serein.Workbench.Avalonia/Commands/MyCommand.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.Avalonia.Commands
+{
+    /// <summary>
+    /// 流程控制命令
+    /// </summary>
+    internal class MyCommand : CommandBase
+    {
+        private readonly Action _execute;
+        private readonly Func<bool> _canExecute;
+
+        /// <summary>
+        /// 构造函数接收执行动作和是否可执行的条件
+        /// </summary>
+        /// <param name="execute"></param>
+        /// <param name="canExecute"></param>
+        /// <exception cref="ArgumentNullException"></exception>
+        public MyCommand(Action execute, Func<bool> canExecute = null)
+        {
+            _execute = execute ?? throw new ArgumentNullException(nameof(execute));
+            _canExecute = canExecute;
+        }
+
+        /// <summary>
+        /// 重写 CanExecute 方法，基于 _canExecute 委托的结果来判断命令是否可执行
+        /// </summary>
+        /// <param name="parameter"></param>
+        /// <returns></returns>
+        public override bool CanExecute(object parameter)
+        {
+            return _canExecute?.Invoke() ?? true;
+        }
+
+        /// <summary>
+        /// 重写 Execute 方法，执行具体的命令逻辑
+        /// </summary>
+        /// <param name="parameter"></param>
+        public override void Execute(object parameter)
+        {
+            _execute();
+        }
+    }
+}