背景:TextBox可以很轻松地对Text使用Binding,绑定ViewModel类里面的属性
即:<Text="{Binding LoginId}"/>
但是使用PasswordBox的密码框就不行了,因为没有Text这个属性
那么就要自己实现一个PasswordBox的帮助类了
第一步添加Helper类
public class PasswordBindingHelper
{
public static readonly DependencyProperty PasswordProperty =
DependencyProperty.RegisterAttached("Password",
typeof(string), typeof(PasswordBindingHelper),
new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged));
public static readonly DependencyProperty AttachProperty =
DependencyProperty.RegisterAttached("Attach",
typeof(bool), typeof(PasswordBindingHelper), new PropertyMetadata(false, Attach));
private static readonly DependencyProperty IsUpdatingProperty =
DependencyProperty.RegisterAttached("IsUpdating", typeof(bool),
typeof(PasswordBindingHelper));
public static void SetAttach(DependencyObject dp, bool value)
{
dp.SetValue(AttachProperty, value);
}
public static bool GetAttach(DependencyObject dp)
{
return (bool)dp.GetValue(AttachProperty);
}
public static string GetPassword(DependencyObject dp)
{
return (string)dp.GetValue(PasswordProperty);
}
public static void SetPassword(DependencyObject dp, string value)
{
dp.SetValue(PasswordProperty, value);
}
private static bool GetIsUpdating(DependencyObject dp)
{
return (bool)dp.GetValue(IsUpdatingProperty);
}
private static void SetIsUpdating(DependencyObject dp, bool value)
{
dp.SetValue(IsUpdatingProperty, value);
}
private static void OnPasswordPropertyChanged(DependencyObject sender,
DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
passwordBox.PasswordChanged -= PasswordChanged;
if (!(bool)GetIsUpdating(passwordBox))
{
passwordBox.Password = (string)e.NewValue;
}
passwordBox.PasswordChanged += PasswordChanged;
}
private static void Attach(DependencyObject sender,
DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
if (passwordBox == null)
return;
if ((bool)e.OldValue)
{
passwordBox.PasswordChanged -= PasswordChanged;
}
if ((bool)e.NewValue)
{
passwordBox.PasswordChanged += PasswordChanged;
}
}
private static void PasswordChanged(object sender, RoutedEventArgs e)
{
PasswordBox passwordBox = sender as PasswordBox;
SetIsUpdating(passwordBox, true);
SetPassword(passwordBox, passwordBox.Password);
SetIsUpdating(passwordBox, false);
}
}
第二步:到xaml中使用帮助类添加PasswordBox的绑定就行了:
local:PasswordBindingHelper.Password="{Binding LoginPwd,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
这下就可以绑定VeiwModel类下面的LoginPwd了文章来源:https://www.toymoban.com/news/detail-697331.html
参考:mvvmlight下passwordBox绑定的解决方法_azyrg88422的博客-CSDN博客文章来源地址https://www.toymoban.com/news/detail-697331.html
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