C# 从ViewModle打开xaml窗口并等待DialogResult的最佳方式是什么？

目前，我正在使用如下

在xaml中

<Button Content="X" Width="33" Height="16" Padding="1,-2,1,0"  
 Command="{Binding ElementName=UserControlName, Path=DataContext.DenyCommand}"
   <Button.CommandParameter>
     <wpfext:UICommandParameter UICommandCallerCallback="{Binding ElementName=UserControlName, Path=UIDenyCallBackCommand}"/>
   </Button.CommandParameter>
</Button>

在ViewModel.cs中

internal ViewModel()
        {
         this.DenyCommand= new DenyCommand(this.AccessDeny);
        }
public void AccessDeny(ICommandState commandState)
        {
            commandState.InvokeCallerCallback("AccessDenied");
        }

public CommandCallback DenyCommand
        {
            get;
            private set;
        }

UICommandCallerCallback声明如下

public delegate void UICommandCallerCallback(object commandParameter, object callbackData);

public class CommandCallback:ICommand
    {
        private readonly Action<ICommandState> executeMethod;

        private readonly Func<ICommandState, bool> canExecuteMethod;

        public CommandCallback(Action<ICommandState> executeMethod)
            : this(executeMethod, null)
        {
        }

        public CommandCallback(Action<ICommandState> executeMethod, Func<ICommandState, bool> canExecuteMethod)
        {
            if (executeMethod == null)
            {
                throw new ArgumentNullException("executeMethod");
            }
            this.executeMethod = executeMethod;
            this.canExecuteMethod = canExecuteMethod;
        }  

        public bool CanExecute(object parameter)
        {
            return this.canExecuteMethod != null ? this.canExecuteMethod((ICommandState)parameter) : true;
        }

        public void Execute(object parameter)
        {
            if (parameter == null)
            {
                throw new ArgumentNullException("parameter","CommandCallback parameter cannot be null");
            }
            if (!(parameter is ICommandState))
            {
                throw new ArgumentException("expects a parameter of type ICommandState","parameter");
            }

            ICommandState state = (ICommandState)parameter;
            this.executeMethod.Invoke(state);
        }

        public event EventHandler CanExecuteChanged
        {
            add
            {
                CommandManager.RequerySuggested += value;
            }

            remove
            {
                CommandManager.RequerySuggested -= value;
            }
        }
    }

CommandCallback类如下所示

public delegate void UICommandCallerCallback(object commandParameter, object callbackData);

public class CommandCallback:ICommand
    {
        private readonly Action<ICommandState> executeMethod;

        private readonly Func<ICommandState, bool> canExecuteMethod;

        public CommandCallback(Action<ICommandState> executeMethod)
            : this(executeMethod, null)
        {
        }

        public CommandCallback(Action<ICommandState> executeMethod, Func<ICommandState, bool> canExecuteMethod)
        {
            if (executeMethod == null)
            {
                throw new ArgumentNullException("executeMethod");
            }
            this.executeMethod = executeMethod;
            this.canExecuteMethod = canExecuteMethod;
        }  

        public bool CanExecute(object parameter)
        {
            return this.canExecuteMethod != null ? this.canExecuteMethod((ICommandState)parameter) : true;
        }

        public void Execute(object parameter)
        {
            if (parameter == null)
            {
                throw new ArgumentNullException("parameter","CommandCallback parameter cannot be null");
            }
            if (!(parameter is ICommandState))
            {
                throw new ArgumentException("expects a parameter of type ICommandState","parameter");
            }

            ICommandState state = (ICommandState)parameter;
            this.executeMethod.Invoke(state);
        }

        public event EventHandler CanExecuteChanged
        {
            add
            {
                CommandManager.RequerySuggested += value;
            }

            remove
            {
                CommandManager.RequerySuggested -= value;
            }
        }
    }

---

完成此工作流程的最佳方法是什么？请告知。谢谢。

在中通读用户交互模式。

在中通读用户交互模式。

为什么要将消息从视图模型发送到视图？如果要在视图模型中显示对话框窗口，该怎么办？这是做这个工作流程最直接的方法。根据我们的项目工作流程，我是不允许做的。如果我使用EventHandler，它就可以像我的工作流一样工作。但是每次卸载usercontrol时，我都需要分离事件，而且速度很慢。而且，我使用winform弹出.sry，我的意思是我使用xaml窗口弹出，而不是win form。为什么要将消息从视图模型发送到视图？如果要在视图模型中显示对话框窗口，该怎么办？这是做这个工作流程最直接的方法。根据我们的项目工作流程，我是不允许做的。如果我使用EventHandler，它就可以像我的工作流一样工作。但是每次卸载usercontrol时，我都需要分离事件，而且速度很慢。而且，我使用winform弹出.sry，我的意思是我使用xaml窗口弹出，而不是win窗体。