【发布时间】:2010-11-12 19:44:23
【问题描述】:
我不确定为什么验证状态没有反映在我的用户控件中。
我抛出异常,但由于某种原因,控件不显示验证状态...当我在 MainPage 上使用标准 Textbox(在我的示例中现在已注释掉)时,它显示错误状态,而不是确定为什么它不包装。
我已经精简了它,所以基本上它是一个包含TextBox 的用户控件。
我错过了什么??
MyUserControl XAML:
<UserControl x:Class="ValidationWithUserControl.MyUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<TextBox x:Name="TextBox"/>
</Grid>
</UserControl>
MyUserControl 背后的代码:
public partial class MyUserControl : UserControl
{
public MyUserControl()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MyUserControl_Loaded);
this.TextBox.Unloaded += new RoutedEventHandler(TextBox_Unloaded);
}
public string Value
{
get { return (string)base.GetValue(ValueProperty); }
set { base.SetValue(ValueProperty, value); }
}
public static DependencyProperty ValueProperty =
DependencyProperty.Register(
"Value",
typeof(string),
typeof(MyUserControl),
new PropertyMetadata(null));
private void MyUserControl_Loaded(object sender, RoutedEventArgs e)
{
this.TextBox.SetBinding(TextBox.TextProperty, new Binding()
{
Source = this,
Path = new PropertyPath("Value"),
Mode = BindingMode.TwoWay,
ValidatesOnExceptions = true,
NotifyOnValidationError= true
});
}
private void TextBox_Unloaded(object sender, RoutedEventArgs e)
{
this.TextBox.ClearValue(TextBox.TextProperty);
}
}
我的主页 XAML:
<Grid x:Name="LayoutRoot" Background="LightBlue">
<StackPanel>
<uc:MyUserControl x:Name="UC" Value="{Binding Path=Value, Mode=TwoWay}" Height="20" Width="100" />
<!--TextBox x:Name="MS" Text="{Binding Path=Value, Mode=TwoWay, ValidatesOnExceptions=True, NotifyOnValidationError=True}" Height="20" Width="100" /-->
</StackPanel>
</Grid>
我的主页代码背后:
public partial class MainPage : UserControl
{
private Model model;
//private Model model2;
public MainPage()
{
InitializeComponent();
this.model = new Model("UC");
//this.model2 = new Model("MS");
this.UC.DataContext = this.model;
//this.MS.DataContext = this.model2;
}
}
我的模特:
public class Model
{
public Model(string answer)
{
this.answer = answer;
}
private string answer;
public string Value
{
get
{
return this.answer;
}
set
{
if (!String.IsNullOrEmpty(value))
this.answer = value;
else
throw new Exception("Error");
}
}
}
【问题讨论】:
标签: c# silverlight validation xaml