Question

是否有一种简单的方法可以打印所有Messenger.Default.Send（）进行调试？不想覆盖它们。

Answer 1

在每个人都从中继承的抽象ViewModel中创建一个函数，该函数使用一个define或全局变量来确定它是否同样调试。如果您正在以调试或发布方式运行，也可能是这样。

public abstract BaseViewModel
    public SendMessage()
    {
        if(DEBUG) // The global variable, or definition, or current run type - whatever
            Debug.WriteLine();
        // else // Commented if you want to always send, uncomment if you want to send instead.
        Messenger.Default.Send();
    }


public RealViewModel : BaseViewModel
...
    SomeMethod()
    {
        ...
        base.SendMessage();

Answer 2

是的，所以我最终得到了自己的Messenger包装器。没有聪明的解决方案，只需简单的包装。万一，其他任何人都需要它：

public static class MvvmLightMessenger
{
    public static void Register<TMessage>(object recipient, Action<TMessage> action)
    {
        Messenger.Default.Register(recipient,action);
    }

    public static void Register<TMessage>(object recipient, bool receiveDerivedMessagesToo, Action<TMessage> action)
    {
        Messenger.Default.Register(recipient, receiveDerivedMessagesToo, action);
    }

    public static void Register<TMessage>(object recipient, object token, Action<TMessage> action)
    {
        Messenger.Default.Register(recipient, token, action);
    }

    public static void Register<TMessage>(object recipient, object token, bool receiveDerivedMessagesToo, Action<TMessage> action)
    {
        Messenger.Default.Register(recipient, token, receiveDerivedMessagesToo, action);
    }





    public static void Send<TMessage>(TMessage message)
    {
        Debug.WriteLine("{!} Message: " + message);
        Messenger.Default.Send<TMessage>(message);
    }

    public static void Send<TMessage, TTarget>(TMessage message)
    {
        Debug.WriteLine("{!} Message: " + message + " to target: " + typeof(TTarget));
        Messenger.Default.Send<TMessage, TTarget>(message);
    }

    public static void Send<TMessage>(TMessage message, object token)
    {
        Debug.WriteLine("{!} Message: " + message + " token: " + token);
        Messenger.Default.Send<TMessage>(message, token);
    }







    public static void Unregister<TMessage>(object recipient)
    {
        Messenger.Default.Unregister<TMessage>(recipient);
    }

    public static void Unregister<TMessage>(object recipient, Action<TMessage> action)
    {
        Messenger.Default.Unregister<TMessage>(recipient, action);
    }

    public static void Unregister<TMessage>(object recipient, object token)
    {
        Messenger.Default.Unregister<TMessage>(recipient, token);
    }

    public static void Unregister<TMessage>(object recipient, object token, Action<TMessage> action)
    {
        Messenger.Default.Unregister<TMessage>(recipient, token, action);
    }
}

MvvmLight打印消息进行调试

2 个答案: