我正在开发一个Windows Phone应用程序。我要求用户登录。
在登录页面上,用户必须输入密码。
现在我想要的是我给用户一个复选框,选中后应该显示密码的字符。
我没有在密码框中看到任何显示密码字符的属性。
请建议一些方法来做到这一点。
答案 0 :(得分:22)
不要认为PasswordBox是可能的......只是一个想法,但你可以使用隐藏的TextBox完成相同的结果,当用户点击CheckBox时,你只需隐藏PasswordBox并显示TextBox;如果他再次点击,你再次切换他们的可见性状态,依此类推......
修改强>
这就是如何!
只需添加页面,将ContentPanel更改为StackPanel并添加此XAML代码:
<PasswordBox x:Name="MyPasswordBox" Password="{Binding Text, Mode=TwoWay, ElementName=MyTextBox}"/>
<TextBox x:Name="MyTextBox" Text="{Binding Password, Mode=TwoWay, ElementName=MyPasswordBox}" Visibility="Collapsed" />
<CheckBox x:Name="ShowPasswordCharsCheckBox" Content="Show password" Checked="ShowPasswordCharsCheckBox_Checked" Unchecked="ShowPasswordCharsCheckBox_Unchecked" />
接下来,在页面代码上添加以下内容:
private void ShowPasswordCharsCheckBox_Checked(object sender, RoutedEventArgs e)
{
MyPasswordBox.Visibility = System.Windows.Visibility.Collapsed;
MyTextBox.Visibility = System.Windows.Visibility.Visible;
MyTextBox.Focus();
}
private void ShowPasswordCharsCheckBox_Unchecked(object sender, RoutedEventArgs e)
{
MyPasswordBox.Visibility = System.Windows.Visibility.Visible;
MyTextBox.Visibility = System.Windows.Visibility.Collapsed;
MyPasswordBox.Focus();
}
这很好用,但是还有一些工作,你可以完全做MVVM!
答案 1 :(得分:1)
使用默认密码框,无法实现您想要的功能。
您可以在此处找到更多信息:http://social.msdn.microsoft.com/Forums/en/wpf/thread/98d0d4d4-1463-481f-b8b1-711119a6ba99
答案 2 :(得分:0)
您可以创建自己的继承自文本框的控件,但是在每个字符之后用*替换它,将真值存储在页面上的私有变量中。使用复选框,您可以切换文本框中的值是显示真值还是*值。
这不是一个优雅的解决方案,也不是最佳实践,但是如果您愿意接受它,我认为它仍然是一种替代方案。
答案 3 :(得分:0)
我创建了一个MVVM示例,我也在现实生活中使用了该示例。请注意,PasswordBox.Password不是依赖项属性,因此无法直接绑定。出于安全原因,它是这样设计的,有关详细信息,请参见:How to bind to a PasswordBox in MVVM
如果仍然要执行此操作,则必须使用后面的代码为视图模型构建桥梁。我没有提供转换器,因为您可能正在使用自己的转换器集。如果没有,请向Google请求合适的实现。
EnterPasswordWindow.xaml
<Window x:Class="MyDemoApp.Controls.EnterPasswordWindow"
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:MyDemoApp.Controls"
mc:Ignorable="d" d:DataContext="{d:DesignInstance local:EnterPasswordViewModel}"
WindowStartupLocation="CenterOwner" ResizeMode="NoResize" SizeToContent="WidthAndHeight"
Title="Enter Password">
<StackPanel Margin="4">
<TextBlock Margin="4">Please enter a password:</TextBlock>
<TextBox Margin="4" Text="{Binding Password, UpdateSourceTrigger=PropertyChanged}" Visibility="{Binding ShowPassword, Converter={StaticResource BoolToVisibleConverter}}"/>
<PasswordBox Margin="4" Name="PasswordBox" Visibility="{Binding ShowPassword, Converter={StaticResource BoolToHiddenConverter}}" PasswordChanged="PasswordBox_PasswordChanged"/>
<CheckBox Margin="4" IsChecked="{Binding ShowPassword}">Show password</CheckBox>
<DockPanel>
<Button Margin="4" Width="150" Height="30" IsDefault="True" IsEnabled="{Binding Password, Converter={StaticResource StringIsNotNullOrEmptyConverter}}" Click="Button_Click">OK</Button>
<Button Margin="4" Width="150" Height="30" IsCancel="True" HorizontalAlignment="Right">Cancel</Button>
</DockPanel>
</StackPanel>
</Window>
EnterPasswordWindow.xaml.cs
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
namespace MyDemoApp.Controls
{
/// <summary>
/// Interaction logic for EnterPasswordWindow.xaml
/// </summary>
public partial class EnterPasswordWindow : Window
{
public EnterPasswordWindow()
{
InitializeComponent();
DataContext = ViewModel = new EnterPasswordViewModel();
ViewModel.PropertyChanged += ViewModel_PropertyChanged;
}
public EnterPasswordViewModel ViewModel { get; set; }
private void Button_Click(object sender, RoutedEventArgs e)
{
DialogResult = true;
Close();
}
private void ViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (!mSuppressPropertyChangedEvent && e.PropertyName == nameof(ViewModel.Password))
{
PasswordBox.Password = ViewModel.Password;
}
}
private bool mSuppressPropertyChangedEvent;
private void PasswordBox_PasswordChanged(object sender, RoutedEventArgs e)
{
mSuppressPropertyChangedEvent = true;
ViewModel.Password = ((PasswordBox)sender).Password;
mSuppressPropertyChangedEvent = false;
}
}
}
EnterPasswordViewModel.cs
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace MyDemoApp.Controls
{
public class EnterPasswordViewModel : INotifyPropertyChanged
{
public string Password
{
get => mPassword;
set
{
if (mPassword != value)
{
mPassword = value;
NotifyPropertyChanged();
}
}
}
private string mPassword;
public bool ShowPassword
{
get => mShowPassword;
set
{
if (mShowPassword != value)
{
mShowPassword = value;
NotifyPropertyChanged();
}
}
}
private bool mShowPassword;
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName]string propertyName = null)
{
if (string.IsNullOrEmpty(propertyName))
{
return;
}
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}