WPF IDataErrorInfo多字段验证 [英] WPF IDataErrorInfo multiple field validation

问题描述

将多字段验证与IDataErrorInfo集成的好方法是什么?

What is a good way to integrate multiple field validation with IDataErrorInfo?

假设我有一个包含3个文本框的ftp信息对话框

Let say that I have a dialog with 3 textboxes for ftp information

• URL
• 用户名
• 密码

我已经在字段上放置了Required属性(假设普通的TextBox用作密码).

I have put the Required attribute on the fields (assume a normal TextBox for the password).

当用户按确定"时，我将验证ftp连接.目前，我显示一个对话框，但是如果我可以触发ftp连接错误时的Validation错误样式，那就太好了.

I validate the ftp connection when the user press "OK". At the moment I show a dialog but it would be nice if I could trigger the Validation error style on ftp connection errors.

我看过Validation.MarkInvalid，但不知道如何使用它.

I have looked at Validation.MarkInvalid but don't understand how to use it.

var be = GetBindingExpression(xamlURLField);
Validation.MarkInvalid(be, new ValidationError(-- WhatValidationRuleToPutHere --, be, "Can't connect to ftp", null)

推荐答案

您在这里有点担心.验证用于在基本级别上验证用户输入.进行一些后验证的方法应有所不同，并且通常要比您在验证"区域中想要的要复杂得多.当这样的事情很难的时候，通常有一个原因，这就是原因.

You are mixing concerns a little here. Validation is for validating user input on a basic level. Doing some post-verification should be handled differently and is generally more complex than you'd want to encompass in the area of "Validation". When something like this is hard, there is usually a reason and this is the reason.

我将尝试连接作为用户交互中的一个单独步骤，并手动显示一条消息.

I would treat trying to connect as a separate step in your user interaction and display a message manually.

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