日期选择器验证 WPF
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Date picker validation WPF
提问by developer
How to apply validations to WPF datepicker toolkit? I want it to error out if invalid date is selected and in some case I have Arrival and Departure dates, so I want to validate it to see that the arrival date is not later than the departure date.
如何将验证应用于 WPF 日期选择器工具包？如果选择了无效日期，我希望它出错，并且在某些情况下我有到达和出发日期，所以我想验证它以查看到达日期不晚于出发日期。
采纳答案by jonny
It seems a year above date picker validation was a problem. Anyway, now it works.
似乎超过一年的日期选择器验证是一个问题。无论如何，现在它起作用了。
I am not a WPF specialist, bu I'll try to give you an idea
我不是 WPF 专家，但我会试着给你一个想法
write a validation rule
编写验证规则
public class DateExpiredRule : ValidationRule
{
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
DateTime orderDate = (DateTime)value;
return new ValidationResult(orderDate < DateTime.Now, "Please, enter date before Now()");
}
}
then you can attach it to datepicker
然后你可以将它附加到日期选择器
<!-- since validation works hand by hand with binding,
I use hidden datepicker as binding source -->
<WPFToolkit:DatePicker Name="dateProvider" Visibility="Collapsed">
</WPFToolkit:DatePicker>
<WPFToolkit:DatePicker Name="notExpired">
<WPFToolkit:DatePicker.SelectedDate>
<Binding ElementName="dateProvider" Path="SelectedDate" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<local:DateExpiredRule/>
</Binding.ValidationRules>
</Binding>
</WPFToolkit:DatePicker.SelectedDate>
</WPFToolkit:DatePicker>
specify control template when validation error occurs. By default validation error changes border color. I used additional tooltip when mouse is over control.
发生验证错误时指定控制模板。默认情况下，验证错误会更改边框颜色。当鼠标超出控制时，我使用了额外的工具提示。
About 'picker to picker' validation.
关于“picker to picker”验证。
I know that one can use custom properties in validation rules (see AgeRangeRule in msdnexample)
我知道可以在验证规则中使用自定义属性（参见msdn示例中的AgeRangeRule ）
Maybe you should use this feature like this
也许你应该像这样使用这个功能
<local:MaxDateRule MaxDate="{Binding ElementName=DepartureDatePicker, Path=SelectedDate" />
but in order to apply binding you need to make MaxDate a DependencyProperty .. you should definetly ask a guru ;)
但是为了应用绑定，您需要使 MaxDate 成为 DependencyProperty .. 您应该明确地询问大师 ;)
Instead of highlighting you should consider intercepting the datepicker value change (via some kind of datepicker 'onchange' event) and accept or reject the change.
您应该考虑拦截 datepicker 值更改（通过某种 datepicker 'onchange' 事件）并接受或拒绝更改，而不是突出显示。
