MVVM光使者不按预期 [英] MVVM Light Messenger Not Functioning As Expected

问题描述

前阵子我在这里问发现了一个问题：的使用MVVM光的使者传递到视图模型之间的值

A while back I asked a question found here: Use MVVM Light's Messenger to Pass Values Between View Model

我今天去测试答案，它似乎没有奏效。我的实现看起来如下：

I went to test the answer today and it doesn't appear to be working. My implementation looks as follows:

MessengerInstance.Send(SelectedDocument, Model.StaticEnums.Tokens.SettingstoMain);

和

MessengerInstance.Register<XDocument>(this, Model.StaticEnums.Tokens.SettingstoMain, settings => CopySettings(settings));

我的问题是，这个实现不工作。相反，对于MessengerInstance.Send和MessengerInstance.Register参数都似乎是在回答实施显着的不同。

My problem is, this implementation doesn't work. Instead, the arguments for MessengerInstance.Send and MessengerInstance.Register both appear to be strikingly different from the implementation in the answer.

我是什么错在这里做什么？在回答我刚才的问题实施正确的？

What am I doing wrong here? Is the implementation in the answer to my previous question correct?

推荐答案

我没有在过去的几个月里做了很多与MVVM光。但是，我发送和注册消息总是这样（见代码）。也许有新版本更好的方法。但我不认为

I didn't worked a lot with MVVM light in the past few months. But I send and registered messages always this way (see code). Maybe there are better ways in the new version. But I don't think.

GalaSoft.MvvmLight.Messaging.Messenger.Default.Register<string>(this, (a) => { MessageBox.Show(a); });

GalaSoft.MvvmLight.Messaging.Messenger.Default.Send<string>("abc");

请确保您先注册的消息在发送前。

Make sure that you first REGISTER the message before you send it.

编辑：对于每一个消息类型我创建了一个自定义邮件类。所以它更容易在应用程序中使用该消息的代码找到。

For each message type I created a custom message class. So it's easier to find in the code where the message is used in the application.

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