wpf内容控制验证
如何对ContentControl进行验证？ 有一个类负责存储具有度量单位的值，它通过数据集显示在内容控件中，我想在显示和编辑它时检查其正确性，例如，单位不能有值2，或者该值应该小于10000。使用多重绑定解决此问题，编辑值时不满足验证规则 Xaml文件：wpf内容控制验证,wpf,validation,contentcontrol,Wpf,Validation,Contentcontrol,如何对ContentControl进行验证？ 有一个类负责存储具有度量单位的值，它通过数据集显示在内容控件中，我想在显示和编辑它时检查其正确性，例如，单位不能有值2，或者该值应该小于10000。使用多重绑定解决此问题，编辑值时不满足验证规则 Xaml文件： <Window x:Class="DELETE1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
<Window x:Class="DELETE1.MainWindow"
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"
xmlns:local="clr-namespace:DELETE1"
xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"
mc:Ignorable="d"
x:Name="m_win"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<DataTemplate DataType="{x:Type local:ValWithUnits}">
<Border>
<DockPanel>
<ComboBox DockPanel.Dock="Right" Width="60" IsEnabled="True" SelectedIndex="{Binding Unit}" ItemsSource="{Binding Src, ElementName=m_win}" />
<TextBox Text="{Binding Val, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsEnabled="True"/>
</DockPanel>
</Border>
</DataTemplate>
<local:MultiBindingConverter x:Key="MultiBindingConverter" />
</Window.Resources>
<Grid>
<ContentControl x:Name="m_contentControl">
<ContentControl.Content>
<MultiBinding Mode="TwoWay" NotifyOnValidationError="True"
UpdateSourceTrigger="PropertyChanged"
diag:PresentationTraceSources.TraceLevel="High"
Converter="{StaticResource MultiBindingConverter}" >
<Binding Path="Val" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" diag:PresentationTraceSources.TraceLevel="High"></Binding>
<Binding Path="Unit" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" diag:PresentationTraceSources.TraceLevel="High"></Binding>
<MultiBinding.ValidationRules>
<local:ContentControlValidationRule ValidatesOnTargetUpdated="True" x:Name="MValidationRule"/>
</MultiBinding.ValidationRules>
</MultiBinding>
</ContentControl.Content>
</ContentControl>
</Grid>
</Window>
public class ValWithUnits:INotifyPropertyChanged
{
private double m_val;
private int m_unit;
public double Val
{
get => m_val;
set
{
m_val = value;
OnPropertyChanged(nameof(Val));
}
}
public int Unit
{
get => m_unit;
set
{
m_unit = value;
OnPropertyChanged(nameof(Unit));
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public ValWithUnits MyValueWithUnits { get; set; } = new ValWithUnits();
public MainWindow()
{
InitializeComponent();
var a = new Binding("MyValueWithUnits");
a.Source = this;
a.ValidatesOnDataErrors = true;
a.ValidatesOnExceptions = true;
a.NotifyOnValidationError = true;
m_contentControl.SetBinding(ContentControl.ContentProperty, a);
}
public IEnumerable<int> Src => new int[] { 1,2,3};
}
public class ContentControlValidationRule : ValidationRule
{
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
//Debug.Fail("validate");
return ValidationResult.ValidResult;
}
private static ValidationResult BadValidation(string msg) =>
new ValidationResult(false, msg);
}
public class MultiBindingConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
return string.Format("{0}-{1}", values[0], values[1]);
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
return new object[] { 1, 1 };
}
}
<Window x:Class="DELETE1.MainWindow"
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"
xmlns:local="clr-namespace:DELETE1"
xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"
mc:Ignorable="d"
x:Name="m_win"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<DataTemplate DataType="{x:Type local:ValWithUnits}">
<Border>
<DockPanel>
<ComboBox DockPanel.Dock="Right" Width="60" IsEnabled="True" SelectedIndex="{Binding Unit}" ItemsSource="{Binding Src, ElementName=m_win}" />
<TextBox Text="{Binding Val, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsEnabled="True"/>
</DockPanel>
</Border>
</DataTemplate>
<local:MultiBindingConverter x:Key="MultiBindingConverter" />
</Window.Resources>
<Grid>
<ContentControl x:Name="m_contentControl">
<ContentControl.Content>
<MultiBinding Mode="TwoWay" NotifyOnValidationError="True"
UpdateSourceTrigger="PropertyChanged"
diag:PresentationTraceSources.TraceLevel="High"
Converter="{StaticResource MultiBindingConverter}" >
<Binding Path="Val" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" diag:PresentationTraceSources.TraceLevel="High"></Binding>
<Binding Path="Unit" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" diag:PresentationTraceSources.TraceLevel="High"></Binding>
<MultiBinding.ValidationRules>
<local:ContentControlValidationRule ValidatesOnTargetUpdated="True" x:Name="MValidationRule"/>
</MultiBinding.ValidationRules>
</MultiBinding>
</ContentControl.Content>
</ContentControl>
</Grid>
</Window>
public class ValWithUnits:INotifyPropertyChanged
{
private double m_val;
private int m_unit;
public double Val
{
get => m_val;
set
{
m_val = value;
OnPropertyChanged(nameof(Val));
}
}
public int Unit
{
get => m_unit;
set
{
m_unit = value;
OnPropertyChanged(nameof(Unit));
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public ValWithUnits MyValueWithUnits { get; set; } = new ValWithUnits();
public MainWindow()
{
InitializeComponent();
var a = new Binding("MyValueWithUnits");
a.Source = this;
a.ValidatesOnDataErrors = true;
a.ValidatesOnExceptions = true;
a.NotifyOnValidationError = true;
m_contentControl.SetBinding(ContentControl.ContentProperty, a);
}
public IEnumerable<int> Src => new int[] { 1,2,3};
}
public class ContentControlValidationRule : ValidationRule
{
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
//Debug.Fail("validate");
return ValidationResult.ValidResult;
}
private static ValidationResult BadValidation(string msg) =>
new ValidationResult(false, msg);
}
public class MultiBindingConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
return string.Format("{0}-{1}", values[0], values[1]);
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
return new object[] { 1, 1 };
}
}
公共类ValWithUnits:INotifyPropertyChanged
{
私人双m_val；
私人国际货币单位；
公共双Val
{
get=>m_val；
设置
{
m_val=值；
OnPropertyChanged（名称（Val））；
}
}
公共国际单位
{
get=>m_单位；
设置
{
m_单位=值；
物业变更（单位名称）；
}
}
公共事件属性更改事件处理程序属性更改；
[NotifyPropertyChangedInvocator]
受保护的虚拟void OnPropertyChanged（字符串propertyName）
{
PropertyChanged？.Invoke（这是新的PropertyChangedEventArgs（propertyName））；
}
}
///
///MainWindow.xaml的交互逻辑
///
公共部分类主窗口：窗口
{
public ValWithUnits MyValueWithUnits{get；set；}=new ValWithUnits（）；
公共主窗口（）
{
初始化组件（）；
var a=新绑定（“MyValueWithUnits”）；
a、 来源=此；
a、 ValidateSondaerRors=真；
a、 ValidatesOnExceptions=true；
a、 NotifyOnValidationError=true；
m_contentControl.SetBinding（contentControl.ContentProperty，a）；
}
公共IEnumerable Src=>newint[]{1,2,3}；
}
公共类ContentControlValidationRule:ValidationRule
{
公共覆盖验证结果验证（对象值，CultureInfo CultureInfo）
{
//调试失败（“验证”）；
返回ValidationResult.ValidResult；
}
私有静态验证结果BadValidation（字符串消息）=>
新的ValidationResult（false，msg）；
}
公共类MultiBindingConverter:IMultiValueConverter
{
公共对象转换（对象[]值，类型targetType，对象参数，CultureInfo区域性）
{
返回string.Format（“{0}-{1}”，值[0]，值[1]）；
}
公共对象[]转换回（对象值，类型[]目标类型，对象参数，CultureInfo区域性）
{
返回新对象[]{1，1}；
}
}