为什么文本框边框红色出现在文本框上方的面板上
Why textbox border red color appears on the panel over textbox
我遇到的情况是我的文本框必须进行一些验证,验证后它显示红色边框。
问题是当我将面板悬停在未经验证的文本框上时,红色边框在文本框上方的面板上仍然可见,即使面板完全不透明,
它可能是一个 WPF 文本框错误。
我有下面的代码来产生这个问题:
Xaml:
<Window x:Class="RedTextBoxFix.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:RedTextBoxFix"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<StackPanel Margin="5">
<Canvas Panel.ZIndex="6000" Name="panel2" Margin="5">
<Expander Background="LightGray" ExpandDirection="Right"
Header="Expand over the textbox.."
VerticalAlignment="Top"
HorizontalAlignment="Left">
<StackPanel Width="900" Height="600">
</StackPanel>
</Expander>
</Canvas>
<StackPanel Name="panel1" Visibility="Visible" Margin="5">
<TextBox Name="DataBoundTextBox" Height="20" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center">
<Binding Path="TextValue">
<Binding.ValidationRules>
<ExceptionValidationRule/>
</Binding.ValidationRules>
</Binding>
</TextBox>
</StackPanel>
</StackPanel>
</Window>
文件代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace RedTextBoxFix
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = new MyClass("RemoveThisText");
}
public class MyClass : INotifyPropertyChanged
{
private string mTextValue;
public MyClass(string defaultText)
{
TextValue = defaultText;
}
public string TextValue
{
get
{
return mTextValue;
}
set
{
mTextValue = value;
if (string.IsNullOrEmpty(mTextValue))
{
throw new ApplicationException("Text value cannot be empty");
}
OnPropertyChanged(new PropertyChangedEventArgs("TextValue"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, e);
}
}
}
}
}
制作步骤:
(1)复制WPF项目中的粘贴代码,然后启动应用程序。
(2) 删除整个文本并按 Tab 键,然后文本框出现红色边框
(3) 展开Expander。
现在扩展面板上出现意外的红色边框。必须删除哪个。
但是怎么办?就是这个问题,有什么帮助吗?
An Adorner is a custom FrameworkElement that is bound to a UIElement. Adorners are rendered in an AdornerLayer, which is a rendering surface that is always on top of the adorned element or a collection of adorned elements.
除其他外,装饰器用于提供视觉反馈,在您的情况下是错误的。 Window 有一个 AdornerDecorator
位于所有内容之上,它包含一个 AdornerLayer
。那是您的装饰器呈现错误的地方。所以你需要在 Canvas
下方添加一个,你可以在 TextBox
.
周围添加一个
<StackPanel Name="panel1" Visibility="Visible" Margin="5">
<AdornerDecorator>
<TextBox Name="DataBoundTextBox" Height="20" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center">
<Binding Path="TextValue">
<Binding.ValidationRules>
<ExceptionValidationRule/>
</Binding.ValidationRules>
</Binding>
</TextBox>
</AdornerDecorator>
</StackPanel>
有关 Microsoft Docs 装饰器的更多详细信息。
我遇到的情况是我的文本框必须进行一些验证,验证后它显示红色边框。 问题是当我将面板悬停在未经验证的文本框上时,红色边框在文本框上方的面板上仍然可见,即使面板完全不透明, 它可能是一个 WPF 文本框错误。
我有下面的代码来产生这个问题: Xaml:
<Window x:Class="RedTextBoxFix.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:RedTextBoxFix"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<StackPanel Margin="5">
<Canvas Panel.ZIndex="6000" Name="panel2" Margin="5">
<Expander Background="LightGray" ExpandDirection="Right"
Header="Expand over the textbox.."
VerticalAlignment="Top"
HorizontalAlignment="Left">
<StackPanel Width="900" Height="600">
</StackPanel>
</Expander>
</Canvas>
<StackPanel Name="panel1" Visibility="Visible" Margin="5">
<TextBox Name="DataBoundTextBox" Height="20" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center">
<Binding Path="TextValue">
<Binding.ValidationRules>
<ExceptionValidationRule/>
</Binding.ValidationRules>
</Binding>
</TextBox>
</StackPanel>
</StackPanel>
</Window>
文件代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace RedTextBoxFix
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = new MyClass("RemoveThisText");
}
public class MyClass : INotifyPropertyChanged
{
private string mTextValue;
public MyClass(string defaultText)
{
TextValue = defaultText;
}
public string TextValue
{
get
{
return mTextValue;
}
set
{
mTextValue = value;
if (string.IsNullOrEmpty(mTextValue))
{
throw new ApplicationException("Text value cannot be empty");
}
OnPropertyChanged(new PropertyChangedEventArgs("TextValue"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, e);
}
}
}
}
}
制作步骤:
(1)复制WPF项目中的粘贴代码,然后启动应用程序。
(2) 删除整个文本并按 Tab 键,然后文本框出现红色边框
(3) 展开Expander。
现在扩展面板上出现意外的红色边框。必须删除哪个。 但是怎么办?就是这个问题,有什么帮助吗?
An Adorner is a custom FrameworkElement that is bound to a UIElement. Adorners are rendered in an AdornerLayer, which is a rendering surface that is always on top of the adorned element or a collection of adorned elements.
除其他外,装饰器用于提供视觉反馈,在您的情况下是错误的。 Window 有一个 AdornerDecorator
位于所有内容之上,它包含一个 AdornerLayer
。那是您的装饰器呈现错误的地方。所以你需要在 Canvas
下方添加一个,你可以在 TextBox
.
<StackPanel Name="panel1" Visibility="Visible" Margin="5">
<AdornerDecorator>
<TextBox Name="DataBoundTextBox" Height="20" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center">
<Binding Path="TextValue">
<Binding.ValidationRules>
<ExceptionValidationRule/>
</Binding.ValidationRules>
</Binding>
</TextBox>
</AdornerDecorator>
</StackPanel>
有关 Microsoft Docs 装饰器的更多详细信息。