我在这里和互联网上看了很多解决方案，但是我似乎无法解决这个问题。我只是想为我正在开发的应用程序进行简单的登录。最终我将它连接到服务器上的SQL数据库，但现在忘记了。这是代码：
<Controls:MetroWindow x:Class="ScotiaPlayTrade.Wpf.Application.LoginWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:ff="clr-namespace:ScotiaPlayTrade.Wpf.Application"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns:System="clr-namespace:System;assembly=mscorlib" Title="Authentication"
Height="400" Width="600" WindowStartupLocation="CenterScreen" TitleForeground="#999988"
ResizeMode="NoResize" WindowStyle="None" WindowState="Normal" ShowMaxRestoreButton="False">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<!--Username Layout-->
<TextBlock
Margin="10,10,10,10"
Grid.Column="0"
Grid.Row="0">
User Name
</TextBlock>
<TextBox
Margin="10,10,10,10"
x:Name="userName"
Grid.Column="5"
Grid.Row="0"
Text="{x:Static System:Environment.UserName}"
IsReadOnly="True">
</TextBox>
<!--Password Layout-->
<TextBlock
Margin="10,10,10,10"
Grid.Column="0"
Grid.Row="1">
Password
</TextBlock>
<PasswordBox
Margin="10,10,10,10"
Width="200"
x:Name="PasswordBox"
ff:PasswordBoxAssistant.BindPassword="true" x:PasswordBoxAssistant.BoundPassword="{Binding Path=Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
Grid.Column="1"
Grid.Row="1">
</PasswordBox >
<!--Buttons Layout-->
<StackPanel Margin="3,3,3,3" Orientation="Horizontal" Grid.Column="1" Grid.Row="2">
<Button
Margin="10,10,10,10"
Click="Login_Click"
IsDefault="True">
Login
</Button>
<Button
Margin="10,10,10,10"
Click="Exit_Click"
IsCancel="True">
Exit
</Button>
<Button
Margin="10,10,10,10"
Click="AddNewUser_Click"
IsCancel="True">
New User
</Button>
</StackPanel>
</Grid>
那是我的LoginWindow.xaml，这是我窗口的cs代码。
public partial class LoginWindow
{
public LoginWindow()
{
InitializeComponent();
}
//Clicking Login Button
private void Login_Click(object sender, RoutedEventArgs e)
{
//Check that password field is not null
if (PasswordBox != null)
{
//Check that username matches password, if it matches then open main window
//Launch the main window after authentication is complete
MainWindow myMainWindow = new MainWindow();
myMainWindow.Show();
//Close the login screen
Close();
}
else
{
MessageBox.Show("Password field cannot be empty!");
}
}
//Clicking Exit Button
private void Exit_Click(object sender, RoutedEventArgs e)
{
Close();
}
//Clicking Exit Button
private void AddNewUser_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("Not yet implemented");
}
}
我已经尝试使用passwordbox，它一直给我一个WPF不支持它的错误，比如PasswordBoxAssistant和Helper。非常感谢任何帮助。以下是错误消息： 错误1 Windows Presentation Foundation（WPF）项目不支持PasswordBoxAssistant 错误5 XML名称空间“http://schemas.microsoft.com/winfx/2006/xaml”中不存在“PasswordBoxAssistant.BindPassword”属性。第50行第13位。
好的，现在我创建了一个名为PasswordValidation的类，并添加了PasswordBoxAssistant代码。
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.Shapes;
namespace ScotiaPlayTrade.Wpf.Application
{
public static class PasswordBoxAssistant
{
public static readonly DependencyProperty BoundPassword =
DependencyProperty.RegisterAttached("BoundPassword", typeof(string), typeof(PasswordBoxAssistant), new PropertyMetadata(string.Empty, OnBoundPasswordChanged));
public static readonly DependencyProperty BindPassword = DependencyProperty.RegisterAttached(
"BindPassword", typeof(bool), typeof(PasswordBoxAssistant), new PropertyMetadata(false, OnBindPasswordChanged));
private static readonly DependencyProperty UpdatingPassword =
DependencyProperty.RegisterAttached("UpdatingPassword", typeof(bool), typeof(PasswordBoxAssistant), new PropertyMetadata(false));
private static void OnBoundPasswordChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox box = d as PasswordBox;
// only handle this event when the property is attached to a PasswordBox
// and when the BindPassword attached property has been set to true
if (d == null || !GetBindPassword(d))
{
return;
}
// avoid recursive updating by ignoring the box's changed event
box.PasswordChanged -= HandlePasswordChanged;
string newPassword = (string)e.NewValue;
if (!GetUpdatingPassword(box))
{
box.Password = newPassword;
}
box.PasswordChanged += HandlePasswordChanged;
}
private static void OnBindPasswordChanged(DependencyObject dp, DependencyPropertyChangedEventArgs e)
{
// when the BindPassword attached property is set on a PasswordBox,
// start listening to its PasswordChanged event
PasswordBox box = dp as PasswordBox;
if (box == null)
{
return;
}
bool wasBound = (bool)(e.OldValue);
bool needToBind = (bool)(e.NewValue);
if (wasBound)
{
box.PasswordChanged -= HandlePasswordChanged;
}
if (needToBind)
{
box.PasswordChanged += HandlePasswordChanged;
}
}
private static void HandlePasswordChanged(object sender, RoutedEventArgs e)
{
PasswordBox box = sender as PasswordBox;
// set a flag to indicate that we're updating the password
SetUpdatingPassword(box, true);
// push the new password into the BoundPassword property
SetBoundPassword(box, box.Password);
SetUpdatingPassword(box, false);
}
public static void SetBindPassword(DependencyObject dp, bool value)
{
dp.SetValue(BindPassword, value);
}
public static bool GetBindPassword(DependencyObject dp)
{
return (bool)dp.GetValue(BindPassword);
}
public static string GetBoundPassword(DependencyObject dp)
{
return (string)dp.GetValue(BoundPassword);
}
public static void SetBoundPassword(DependencyObject dp, string value)
{
dp.SetValue(BoundPassword, value);
}
private static bool GetUpdatingPassword(DependencyObject dp)
{
return (bool)dp.GetValue(UpdatingPassword);
}
private static void SetUpdatingPassword(DependencyObject dp, bool value)
{
dp.SetValue(UpdatingPassword, value);
}
}
}
以下是我得到的错误：
错误1名称“PasswordBoxAssistant”在名称空间“clr-namespace：ScotiaPlayTrade.Wpf.Application”中不存在。 50 13
错误2 Windows Presentation Foundation（WPF）项目不支持PasswordBoxAssistant。 50 58
错误3在'PasswordBoxAssistant'类型中找不到可附加属性'BindPassword'。 50 13