问题
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 :
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.
hope I am clear with the details.So Do i need to write different ValidationRule
for each textbox??
Any you inputs??
回答1:
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);
}
}
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>
来源:https://stackoverflow.com/questions/14481240/validationrule-for-wpf-textbox