如何将消息发送到多个视图中的一个 [英] How to send message to one view of many

问题描述

我有一个应用程序，它基于相同的view和viewModel呈现许多view-viewModel对. (即，有很多view-> viewModel实例对)

I have an app that presents many view-viewModel pairs based on the same view and viewModel. (ie there are many view -> viewModel instance pairs)

我可以使用Messenger从viewModel发送/注册消息到视图，并且当我从视图发送消息时，所有视图都会对其进行处理(它们都为消息注册).

I can use the Messenger to send/register messages from viewModel to view, and when I send a message from a view, it is processed by all the views (They all register for the message).

如何使用Messenger将消息从viewModel发送到创建viewModel的特定视图? (所有视图都已注册该消息，但我只希望其中一个视图可以处理该消息)

How would I use the Messenger to send a message from the viewModel to the specific view that created the viewModel? (All the views have registered for the message, but I only want one of the views to process the message)

推荐答案

您可以在发送和注册消息时使用令牌.

You can use the Token while sending and registering Messaging.

假设您必须将Message从ViewModel传递到ABCView，然后可以像这样使用Messenging.

Suppose You have to pass Message From ViewModel to ABCView then you can use Messenging like this..

对于Ex，如果必须传递布尔值，请使用:

For Ex, if you have to pass boolean value then use:

Messenger.Defalut.Send<bool>(true,"ForAbcView");

在ABCView中，您可以这样注册:

And in ABCView you can register like this:

Messenger.Default.Register<bool>(this,"ForAbcView",(b)=>{ //Some Code });

使用令牌时，Messenger发送者将仅查找具有相同令牌的寄存器.它只会调用具有相同令牌的方法.

With using Token the Messenger Sender will only looks for the Register which will have same token. It only calls the method which will have same tocken.

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