Wpf UserControl内部控件的ValidationRules
编辑:在此处找到适合我的解决方案: 详情如下:Wpf UserControl内部控件的ValidationRules,wpf,user-controls,validationrules,Wpf,User Controls,Validationrules,编辑:在此处找到适合我的解决方案: 详情如下: private void TextBoxLoaded(object sender, RoutedEventArgs e) { Binding bd = new Binding(TextBoxText.ToString()); bd.ValidationRules.Add(new DataErrorValidationRule()); bd.UpdateSourceTrigger =
private void TextBoxLoaded(object sender, RoutedEventArgs e)
{
Binding bd = new Binding(TextBoxText.ToString());
bd.ValidationRules.Add(new DataErrorValidationRule());
bd.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
TextBox tb = sender as TextBox;
tb.SetBinding(TextBox.TextProperty, bd);
}
及
那是错误的。不要把人变成1。内容=新人。设为personCc1.DataContext=新人。Content希望您只显示该类的值,主要用于UI。如果我错了,请更正我。您希望对文本框进行验证,并将其DataContext设置为ViewModel以启动验证?我不确定你想在这里实现什么我还是wpf新手,所以我不能正确地表达所有的术语。例如,在上面的代码中,在保存年龄值的文本框中,如果我输入15,它应该转到person类并检查验证规则,然后确定这是“太年轻”。但这并没有发生。似乎正在发生的是,文本框的绑定只是一个经过验证的字符串。我希望对person类上的IDataErrorInfo进行验证,但它只应用于特定的文本框,而不是整个用户控件。希望这有助于解释问题。您是否将ContentControl的DataContext设置为个人的类?是的,对不起,在主窗口的构造函数中,我编辑了原始的PostSimular问题和解决方案:啊,好的。有机会我会试试的。谢谢
<UserControl x:Class="WpfApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:wa="clr-namespace:WpfApplication1"
mc:Ignorable="d">
<DockPanel
VerticalAlignment="Center">
<Label
VerticalAlignment="Center"
Content="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type wa:UserControl1}},Path=LabelContent}"/>
<TextBox
VerticalAlignment="Center"
MinWidth="96"
Loaded="TextBoxLoaded">
</TextBox>
</DockPanel>
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:wa="clr-namespace:WpfApplication1"
Title="MainWindow">
<Window.Resources>
<DataTemplate x:Key="personDisplay">
<DockPanel>
<wa:UserControl1 LabelContent="First name:" TextBoxText="fname"/>
<wa:UserControl1 LabelContent="Last name:" TextBoxText="lname"/>
<wa:UserControl1 LabelContent="Age:" TextBoxText="age"/>
</DockPanel>
</DataTemplate>
</Window.Resources>
<ContentControl
VerticalAlignment="Center"
Name="personCcl"
ContentTemplate="{StaticResource personDisplay}"/>
public class Person : IDataErrorInfo
{
public string fname { get; set; }
public string lname { get; set; }
public int age { get; set; }
public Person(string f, string l, int a)
{
fname = f;
lname = l;
age = a;
}
public string Error
{
get
{
if (age < 18) return "Too young";
else if (fname == null || fname.Length == 0) return "Needs first name";
else if (lname == null || lname.Length == 0) return "Needs last name";
return null;
}
}
public string this[string name]
{
get
{
if (name == "age") { return age < 18 ? "Too young" : null; }
else if (name == "fname") { return fname == null || fname.Length == 0 ? "Needs first name" : null ; }
else if (name == "lname") { return lname == null || lname.Length == 0 ? "Needs last name" : null; }
return null;
}
}
}
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
static readonly public DependencyProperty LabelContentProperty = DependencyProperty.Register(
"LabelContent",
typeof(string),
typeof(UserControl1),
new FrameworkPropertyMetadata("")
);
public string LabelContent
{
get { return GetValue(LabelContentProperty) as string; }
set { SetValue(LabelContentProperty, value); }
}
static readonly public DependencyProperty TextBoxTextProperty = DependencyProperty.Register(
"TextBoxText",
typeof(object),
typeof(UserControl1),
new FrameworkPropertyMetadata(null, new PropertyChangedCallback(OnTextBoxTextChanged), new CoerceValueCallback(CoerceTextBoxText))
);
public object TextBoxText
{
get { return GetValue(TextBoxTextProperty); }
set { SetValue(TextBoxTextProperty, value); }
}
static private void OnTextBoxTextChanged(DependencyObject dob, DependencyPropertyChangedEventArgs ea)
{
var uc = dob as UserControl1;
uc.OnTextBoxTextChanged(new RoutedPropertyChangedEventArgs<object>(ea.OldValue, ea.NewValue, TextBoxTextChangedEvent));
}
static private object CoerceTextBoxText(DependencyObject dob, object o)
{
return o;
}
static readonly public RoutedEvent TextBoxTextChangedEvent = EventManager.RegisterRoutedEvent(
"TextBoxTextChanged",
RoutingStrategy.Bubble,
typeof(RoutedPropertyChangedEventArgs<object>),
typeof(UserControl1));
public event RoutedPropertyChangedEventHandler<object> TextBoxTextChanged
{
add { AddHandler(TextBoxTextChangedEvent, value); }
remove { RemoveHandler(TextBoxTextChangedEvent, value); }
}
protected virtual void OnTextBoxTextChanged(RoutedPropertyChangedEventArgs<object> ea) { RaiseEvent(ea); }
}
<UserControl x:Class="WpfApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:wa="clr-namespace:WpfApplication1"
mc:Ignorable="d">
<DockPanel>
<Label
VerticalAlignment="Center"
Content="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type wa:UserControl1}},
Path=LabelContent}"/>
<TextBox
VerticalAlignment="Center"
MinWidth="96">
<TextBox.Text>
<Binding
RelativeSource="{RelativeSource FindAncestor,
AncestorType={x:Type wa:UserControl1}}"
Path="TextBoxText"
Mode="TwoWay"
UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<DataErrorValidationRule ValidatesOnTargetUpdated="True"/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
</DockPanel>
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:wa="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<DataTemplate x:Key="personDisplay">
<DockPanel>
<wa:UserControl1 LabelContent="First name:" TextBoxText="{Binding fname,Mode=TwoWay}"/>
<wa:UserControl1 LabelContent="Last name:" TextBoxText="{Binding lname,Mode=TwoWay}"/>
<wa:UserControl1 LabelContent="Age:" TextBoxText="{Binding age,Mode=TwoWay}"/>
</DockPanel>
</DataTemplate>
</Window.Resources>
<ContentControl
VerticalAlignment="Center"
Name="personCcl"
ContentTemplate="{StaticResource personDisplay}"/>
</Window>
public MainWindow()
{
InitializeComponent();
personCcl.Content = new Person("John", "Smith", 33);
}