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我在WPF,C#和EntityFramework 4.0做一个应用程序。添加数据验证与IValidatableObject实体框架实体在WPF和C#
我要验证一个日期,我想向用户展示,如果日期是今天这样的事情后:
http://www.nbdtech.com/images/blog/20100621/NiceValidation.png
我的代码是:
在LoanWindow.xaml:
<!-- In my window resources -->
<Style x:Key="datoNoValido" TargetType="{x:Type DatePicker}">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip" Value="Wrong Date"/>
</Trigger>
</Style.Triggers>
</Style>
<!-- After some code in the Grid -->
<DatePicker Style="{StaticResource datoNoValido}"
Name="fecha_SalidaDatePicker"
SelectedDate="{Binding Path=Fecha_Salidad, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true, UpdateSourceTrigger=PropertyChanged}" />
我的部分类:
public partial class Loan : IValidatableObject
{
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
if (DateTime.Compare(MyDate, DateTime.Now.Date) < 0)
{
ValidationResult vr = new ValidationResult("the message", new[] { "MyDate" });
this.validationErrors.Add(vr);
}
return this.validationErrors;
}
}
在LoanWindow.xaml.cs:
//Some code and after
var errors = p.Validate(null);
foreach (var item in errors)
{
MessageBox.Show(item.ErrorMessage);
}
在局部类中定义的消息(匹配实体框架类的名称)shown's起来,但datapicker从未示出的红线。我做错了什么?我应该怎么做?
Thnks。
我只看到IDataErrorInfo的WPF中使用,因此我看它up:http://www.nujk.com/idataerrorinfo-vs-ivalidatableobject这是一个链接,介绍如何在WPF中使用IDataErrorInfo:http://codeblitz.wordpress.com/2009/05/08/wpf-validation-made -easy-with-idataerrorinfo/ –
谢谢@LeeO。我会马上检查它 – Lindsay