有效性规则为WPF文本框 [英] ValidationRule for WPF Textbox

问题描述

我是新手，WPF.In我的用户，我有8个标签和其各自的文本框8如下：

I am newbie to WPF.In my UserControl,I have 8 labels and its respective 8 textboxes as follows:

1.Label : abc   2.Label : def
  TextBox1 :        TextBox2 :

3.Label :xyz    4. Label : ghi
  Textbox3 :        TextBox4 :

每一个文本框的文本属性应包含文字与相应的标签名称
为 TextBox1的结尾。文字应 xxxx.abc ， TextBox2.text 应xxxx.def等on.if文本框不应该有红色边框。

Each of these textbox text property should contain text ending with its respective label name for TextBox1.text should be xxxx.abc, TextBox2.text should be xxxx.def and so on.if not textbox should have red border.

希望我的details.So待办事项清楚我需要编写不同的有效性规则每个文本框??

hope I am clear with the details.So Do i need to write different ValidationRule for each textbox??

任何你输入??

推荐答案

为什么不能有一个有效性规则执行情况，财产暴露哪些领域应，例如结尾：

Why not have one ValidationRule implementation, with a property exposing what the field should end with, e.g:

public class EndsWithValidationRule : ValidationRule
{
    public string MustEndWith { get; set; }

    public override ValidationResult Validate(object value, CultureInfo cultureInfo)
    {
        var str = value as string;
        if(str == null)
        {
            return new ValidationResult(false, "Please enter some text");
        }
        if(!str.EndsWith(MustEndWith))
        {
            return new ValidationResult(false, String.Format("Text must end with '{0}'", MustEndWith));
        }
        return new ValidationResult(true, null);

    }
}

然后就可以用这个像这样

Then you can use this like so:

<TextBox x:Name="TextBox1">
    <TextBox.Text>
        <Binding Path="BoundProperty1" UpdateSourceTrigger="PropertyChanged">
            <Binding.ValidationRules>
                <local:EndsWithValidationRule MustEndWith=".def" />
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

<TextBox x:Name="TextBox2">
    <TextBox.Text>
        <Binding Path="BoundProperty2" UpdateSourceTrigger="PropertyChanged">
            <Binding.ValidationRules>
                <local:EndsWithValidationRule MustEndWith=".abc" />
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

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