如何强制wpf验证规则绑定?

I have a textbox for example that is bound via the mvvm pattern like this:

我有一个文本框，通过mvvm模式绑定如下:

<TextBox VerticalAlignment="Center" Grid.Column="2" Grid.Row="1" Validation.ErrorTemplate="{StaticResource ValidationErrorTemplate}">
            <TextBox.Text>
                <Binding Path="Entity.LastName" NotifyOnValidationError="True">
                    <Binding.ValidationRules>
                        <validations:MandatoryValidationRule/>

This specific rule checks if any value was entered to the textbox. However, this rule is activated only when a user enters some text and then deletes it. Most times, when a user leaves out a blank field, its because he forgot to fill it.

此特定规则检查是否向文本框输入任何值。然而，只有当用户输入一些文本并删除它时，才会激活该规则。大多数情况下，当用户遗漏一个空白字段时，这是因为他忘记填充它。

So, how can i, from the view model, force all validation rules to be checked before i allow the user to actually save the data?

那么，在允许用户实际保存数据之前，如何从视图模型强制检查所有验证规则?

It would be also nice if i could somehow do it to all the controls at once.

如果我能同时对所有的控件进行处理，那就更好了。

Thank u.

谢谢你。

1 个解决方案

#1

-1

You can force the rules to update automatically once the Window has bee loaded so that the blank fields will indicate an error:

当窗口加载bee时，您可以强制规则自动更新，以便空白字段将指示错误:

public void Window_Loaded(object sender, RoutedEventArgs e)
{
    textbox1.GetBindingExpression(TextBox.TextProperty).UpdateSource();
    textbox2.GetBindingExpression(TextBox.TextProperty).UpdateSource();
}

or, you can implement IDataErrorInfo and update your Text binding so that it ValidatesOnDataErrors

或者，您可以实现IDataErrorInfo并更新文本绑定，以便它验证ondataerrors

 <Binding Path="Entity.LastName" NotifyOnValidationError="True" ValidatesOnDataErrors="True">

Here's a simple example on how to implement IDataErrorInfo

下面是一个如何实现IDataErrorInfo的简单示例

#1

-1