WPF取消双向绑定 [英] WPF cancelling twoway binding

问题描述

你好，

我有一个ListBox，其名称和地址显示在数据模板中.当我选择一个项目时，它会打开一个包含其他信息的编辑表单.我正在使用双向绑定，并设置了UpdateSourceTrigger=PropertyChanged.
我在编辑表单上有一个保存和取消按钮. save事件将更改持久保存到数据库.(对SQL的linq)

如果不想保留更改，如何获取取消事件以撤消在编辑表单中所做的更改?现在，如果我选择取消"并显示我的列表框表单.显示更改.
我的第二个难题是.我在编辑表单上有验证.但是，即使更改违反了验证规则，更改仍然会更新源.我尝试设置UpdateSourceTrigger=Explicit.完成时.用户界面上的错误不起作用，例如，我可以清除名称字段，并且不会显示任何通知.设置UpdateSourceTrigger=PropertyChanged时不是这种情况.
欢迎您的帮助
谢谢

Hello,

I have a ListBox with the name and address of my customers displayed in a data template. When I select an item it opens an edit form with other information. I am using two-way binding and have set the UpdateSourceTrigger=PropertyChanged.
I have a save and cancel button on the edit form. The save event persist the changes to the database.(linq to SQL)

How can I get the cancel event to undo the changes I have made in the edit form if I do not want to persist the changes? As it is now if I select cancel and display my listbox form. The changes are displayed.
My second dilemma is. I have validation on the edit form. However the changes still update the source even if it violates the validation rule. I tried setting the UpdateSourceTrigger=Explicit. When this was done. The errors on the UI were not working, E.g., I could clear the name field and no notification will show. This was not the case when I set UpdateSourceTrigger=PropertyChanged.
I welcome you help
Thanks

推荐答案

更改触发器以将其绑定到内部bool属性的状态，该状态指示用户是否单击了正常按钮.

Change the trigger to bind to the state of an internal bool property that indicates whether or not the user clicked okay or not...

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