如何将堆栈窗格的可见性绑定到属性?

Question

我有几个 StackPanes，我只想为组合框的特定值显示它们。我已经让属性按照我想要的方式进行更改，但由于某种原因，当 ComboBox 值更新时，StackPane 可见性不会更新。不知道我在这里做错了什么。

Registered ServersView.xaml

<UserControl x:Class="WpfApp1.Servers.RegisteredServersView"
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:b="http://schemas.microsoft.com/xaml/behaviors"
xmlns:local="clr-namespace:WpfApp1.Servers"
mc:Ignorable="d"
Height="250" Width="600">
<UserControl.DataContext>
<local:RegisteredServersViewModel/>
</UserControl.DataContext>
<StackPanel>
<StackPanel Orientation="Horizontal">
<Label Content="Server Instance:" Margin="30,10,10,10"/>
<TextBox Text="{Binding ServerName, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" 
Width="140" Margin="10">
<Validation.ErrorTemplate>
<ControlTemplate>
<StackPanel Orientation="Horizontal">
<AdornedElementPlaceholder x:Name="textBox"/>
<TextBlock Margin="10" Text="{Binding [0].ErrorContent}" Foreground="Red"/>
</StackPanel>
</ControlTemplate>
</Validation.ErrorTemplate>
</TextBox>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Label Content="Authorization Type:" Margin="10"/>
<ComboBox Name="cbAuthType" 
Margin="10" 
ItemsSource="{Binding Types}"
SelectedItem="{Binding AuthType, UpdateSourceTrigger=PropertyChanged}" 
Width="141"/>
</StackPanel>
<StackPanel Orientation="Horizontal"
Visibility="{Binding Vis}">
<Label Content="Login:" Margin="80,10,10,10"/>
<TextBox Text="{Binding Login, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" 
Width="140" Margin="10">
<Validation.ErrorTemplate>
<ControlTemplate>
<StackPanel Orientation="Horizontal">
<AdornedElementPlaceholder x:Name="textBox"/>
<TextBlock Margin="10" Text="{Binding [0].ErrorContent}" Foreground="Red"/>
</StackPanel>
</ControlTemplate>
</Validation.ErrorTemplate>
</TextBox>
</StackPanel>
<StackPanel Orientation="Horizontal"
Visibility="{Binding Vis}">
<Label Content="Password:" Margin="60,10,10,10"/>
<TextBox Text="{Binding Password, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" 
Width="140" Margin="10">
<Validation.ErrorTemplate>
<ControlTemplate>
<StackPanel Orientation="Horizontal">
<AdornedElementPlaceholder x:Name="textBox"/>
<TextBlock Margin="10" Text="{Binding [0].ErrorContent}" Foreground="Red"/>
</StackPanel>
</ControlTemplate>
</Validation.ErrorTemplate>
</TextBox>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Button x:Name="Reg"
Content="Register"
Click="OnSave"
Margin="145,10,10,10"
Width="60"
IsEnabled="{Binding ButtonEnabled, ValidatesOnDataErrors=True}"/>
<Button x:Name="Cancel"
Content="Cancel"
Click="OnCancel"
Margin="5,10,10,10"
Width="60"/>
</StackPanel>
</StackPanel>
</UserControl>

Registered ServersView.xaml.cs

using Microsoft.Xaml.Behaviors;
using System;
using System.Collections.Generic;
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 WpfApp1.Servers
{ 
public partial class RegisteredServersView : UserControl
{
public RegisteredServersView()
{
InitializeComponent();
DataContext = new RegisteredServersViewModel();
cbAuthType.SelectedItem = cbAuthType.Items[0];
}
public void OnCancel(object sender, RoutedEventArgs e)
{
var window = (Window)VisualParent.GetSelfAndAncestors().FirstOrDefault(a => a is Window);
window.Close();
}
public void OnSave(object sender, RoutedEventArgs e)
{
OnCancel(sender, e);
}
}
}

已注册的服务器视图模型.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Input;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WpfApp1.Data;
using WpfApp1.Repos;
using System.Windows;
namespace WpfApp1.Servers
{
public class RegisteredServersViewModel : INotifyPropertyChanged, IDataErrorInfo
{
private readonly RegisteredServerValidator _validator;
private string _serverName;
private string _authType;
private string _login;
private string _password;
private Visibility _vis;
public IEnumerable<string> _types;
public RegisteredServersViewModel()
{
_types = new List<string>() { "SQLAuth", "Integrated" };
_validator = new RegisteredServerValidator();
}
public IEnumerable<string> Types
{
get { return _types; }
}
public string ServerName
{
get { return _serverName; }
set
{
_serverName = value;
CheckButtonEnabled();
OnPropertyChanged("ServerName");
}
}
public string AuthType
{
get { return _authType; }
set
{
_authType = value;
if(value.Equals("SQLAuth"))
{
Vis = Visibility.Visible;
}
else
{
Vis = Visibility.Hidden;
}
CheckButtonEnabled();
OnPropertyChanged("AuthType");
}
}

public Visibility Vis
{
get { return _vis; }
private set
{ 
_vis = value;
Console.WriteLine(_vis);
OnPropertyChanged("Vis");
}
}
public string Login
{
get { return _login; }
set
{
_login = value;
CheckButtonEnabled();
OnPropertyChanged("Login");
}
}
public string Password
{
get { return _password; }
set
{
_password = value;
CheckButtonEnabled();
OnPropertyChanged("Password");
}
}
public string this[string columnName]
{
get
{
var firstOrDefault = _validator.Validate(this).Errors.FirstOrDefault(lol => lol.PropertyName == columnName);
if(firstOrDefault != null)
{
return _validator != null ? firstOrDefault.ErrorMessage : "";
}
return "";
}
}
public string Error
{
get
{
if(_validator != null)
{
var results = _validator.Validate(this);
if(results != null && results.Errors.Any())
{
var errors = string.Join(Environment.NewLine, results.Errors.Select(x => x.ErrorMessage).ToArray());
return errors;
}
}
return string.Empty;
}
}
private bool _buttonEnabled;
public bool ButtonEnabled
{
get { return _buttonEnabled; }
set
{
_buttonEnabled = value;
//Console.WriteLine(_buttonEnabled);
OnPropertyChanged("ButtonEnabled");
}
}
public void CheckButtonEnabled()
{
if(ServerName != null && AuthType.Equals("SQLAuth") && Login != null && Password != null)
{
ButtonEnabled = true;
}
else if(ServerName != null && !AuthType.Equals("SQLAuth"))
{
ButtonEnabled = true;
}
else
{
ButtonEnabled = false;
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}

注册服务器验证器.cs

using FluentValidation;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WpfApp1.Data;
using WpfApp1.Servers;
namespace WpfApp1
{
class RegisteredServerValidator : AbstractValidator<RegisteredServersViewModel>
{
public RegisteredServerValidator()
{
RuleFor(instance => instance.ServerName)
.NotEmpty()
.WithMessage("This field cannot be left blank.");
RuleFor(instance => instance.Login)
.NotEmpty()
.WithMessage("This field cannot be left blank.");
RuleFor(instance => instance.Password)
.NotEmpty()
.WithMessage("This field cannot be left blank");
}
}
}

不合法属性已更改.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
namespace WpfApp1
{
public class INotifyPropertyChanged : System.ComponentModel.INotifyPropertyChanged
{
protected virtual void SetProperty<T>(ref T member, T val,
[CallerMemberName]string propertyName = null)
{
if (object.Equals(member, val)) return;
member = val;
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
public event PropertyChangedEventHandler PropertyChanged = delegate { };
}
}

RegisterServersWindow.xaml

<Window x:Class="WpfApp1.Servers.RegisteredServersWindow"
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:local="clr-namespace:WpfApp1.Servers"
mc:Ignorable="d" 
Height="300" Width="500"
Title="Registered Servers">
<!--This contains the UserControl with the form.-->
<Grid>
<local:RegisteredServersView HorizontalAlignment="Left"
Margin="0, 0, 0, 0"
VerticalAlignment="Top"/>
</Grid>
</Window>

Registered ServersWindow.xaml.cs

using System;
using System.Collections.Generic;
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 WpfApp1.Servers
{
/// <summary>
/// Interaction logic for RegisteredServersWindow.xaml
/// </summary>
public partial class RegisteredServersWindow : Window
{
public RegisteredServersWindow()
{
InitializeComponent();
}
}
}

我也尝试使用 Visibilty 类而不是布尔值，但也无法让它工作。任何帮助将不胜感激！

Answer 1

我将代码从我的"测试项目"移动到实际项目中，突然它就可以工作了。不知道发生了什么变化，但它现在正在运作。感谢大家的帮助。

Answer 2

我会订阅组合盒的选择更改事件并在那里翻转状态。