如何从业务层显示错误消息 [英] How to display an error msg from business layer

问题描述

在一次采访中，他们问我如何在业务层的UI上显示消息.

例如，仅当年龄大于18岁时，我才允许用户注册.我可以在页面级别进行验证，但是由于某些原因，我将在业务层中进行检查，因此我需要在UI上显示一条消息，要求他们输入更大的年龄超过18岁.

但是通常，我们将显示页面级仪式上的所有错误消息.如何显示业务层中的错误消息

In a an interview they asked me how can we display a msg on UI from business layer.

for example i will allow users to register only if their age is greater than 18 I can do validation in page level but for some reason i will check this in business layer so i need to display a msg on UI that they have to enter age greater than 18 .

But generally we will display all error msg from page level rite how can we display error msg from business layer

推荐答案

一种好方法是使用EventAggrigator(事件聚合器-马丁·福勒
http://www.martinfowler.com/eaaDev/EventAggregator.html [

One good way may be to use an EventAggrigator (Event Aggregator - Martin Fowler
http://www.martinfowler.com/eaaDev/EventAggregator.html[^]). Prism provides an implementation. The Prism example has advantages in that you can specify the thread.

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