添加项目文件。

Commands/ParameterlessCommand.cs

@@ -0,0 +1,29 @@
+using System.Windows.Input;
+
+namespace YwxApp.AiChat.Commands
+{
+ 
+    /// <summary>
+    /// relay  command 
+    /// </summary>
+    public class ParameterlessCommand : ICommand
+    {
+        private Action _execute;
+        public ParameterlessCommand(Action execute)
+        {
+            _execute = execute;
+        }
+        public event EventHandler? CanExecuteChanged;
+
+        public bool CanExecute(object? parameter)
+        {
+            return CanExecuteChanged != null;
+        }
+
+        public void Execute(object? parameter)
+        {
+            _execute.Invoke();
+        }
+    }
+}
+