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我創建了一個自定義密碼框用戶控件，它可以顯示和隱藏密碼。它只是用一個綁定到相同密碼字符串屬性的文本框替換標準密碼框。這一切工作正常，但現在我的數據驗證錯誤不再顯示，雖然他們正在後臺正確生成。下面是從我的用戶控件的XAML：Silverlight IDataErrorInfo消息不顯示在自定義控件的文本框中
<UserControl x:Class="Controls.EAPPasswordBox"
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"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" x:Name="_root">
<Grid x:Name="LayoutRoot" Background="White">
<StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Top">
<PasswordBox x:Name="pwdBox" Password="{Binding Password, Mode=TwoWay,ValidatesOnDataErrors=True}" />
<TextBox x:Name="txtBox" Text="{Binding Password, Mode=TwoWay,ValidatesOnDataErrors=True}" />
</StackPanel>
</Grid>
下面是我如何使用它的一個觀點：
<local:EAPPasswordBox x:Name="pwdBox"
Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="2" Password="{Binding password,Mode=TwoWay, ValidatesOnDataErrors=True}" ShowText="{Binding showPassword,Mode=TwoWay}"></local:EAPPasswordBox>
父視圖的視圖模型，我們實現IDataErrorInfo的是這樣的：
public string this[string columnName]
{
get
{
string Result = "";
switch(columnName.ToLower())
{
case "password":
{
Result = Validatepassword();
break;
}
case "password2":
{
Result = Validatepassword2();
break;
}
default:
{
Result = this.ValidateStringValue(columnName);
break;
}
}
return Result;
}
}
現在，當我在自定義密碼框中輸入文本時，驗證邏輯被稱爲很好但沒有顯示。我必須爲此調整我的用戶控制嗎？
編輯：這是我的passwordbox背後的代碼：
public partial class EAPPasswordBox : UserControl, INotifyPropertyChanged
{
public bool ShowText
{
get { return (bool)GetValue(ShowTextProperty); }
set {
SetValue(ShowTextProperty, value);
if (value == true)
{
this.pwdBox.Visibility = System.Windows.Visibility.Collapsed;
this.txtBox.Visibility = System.Windows.Visibility.Visible;
}
else
{
this.pwdBox.Visibility = System.Windows.Visibility.Visible;
this.txtBox.Visibility = System.Windows.Visibility.Collapsed;
}
}
}
public string Password
{
get { return (string)GetValue(PasswordProperty); }
set { SetValue(PasswordProperty, value); }
}
private Visibility _PwdBoxVisibility;
public Visibility PwdBoxVisibility
{
get { return _PwdBoxVisibility; }
set
{
_PwdBoxVisibility = value; NotifyPropertyChanged("PwdBoxVisibility");
}
}
private Visibility _TxtBoxVisibility;
public Visibility TxtBoxVisibility
{
get { return _TxtBoxVisibility; }
set
{
_TxtBoxVisibility = value; NotifyPropertyChanged("TxtBoxVisibility");
}
}
public static readonly DependencyProperty PasswordProperty =
DependencyProperty.Register("Password", typeof(string), typeof(EAPPasswordBox), null);
public static readonly DependencyProperty ShowTextProperty =
DependencyProperty.Register("ShowText", typeof(bool), typeof(EAPPasswordBox), new PropertyMetadata(OnShowTextPropertyChanged));
public EAPPasswordBox()
{
InitializeComponent();
this.pwdBox.SetBinding(PasswordBox.PasswordProperty, new System.Windows.Data.Binding() { Source = this, Path = new PropertyPath("Password"), Mode = BindingMode.TwoWay,ValidatesOnDataErrors=true });
this.txtBox.SetBinding(TextBox.TextProperty, new System.Windows.Data.Binding() { Source = this, Path = new PropertyPath("Password"), Mode = BindingMode.TwoWay, ValidatesOnDataErrors=true });
this.ShowText = false;
}
private static void OnShowTextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
EAPPasswordBox passwordBox = d as EAPPasswordBox;
if (passwordBox != null)
{
passwordBox.ShowText=(bool)e.NewValue;
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
2日編輯：這也將有助於如果有人只是向我解釋的父窗口的XAML綁定用戶控件的屬性的基礎知識/控制。我不太明白爲什麼用戶控件不會獲取相應父視圖viewmodel屬性的屬性更改事件，因爲它通過xaml綁定到這些屬性。
我解決了它，將加載事件中的控件中的text/pw框直接綁定到viewmodel的屬性。我從父視圖的xaml傳遞控件的普通公共屬性的值，以確定綁定到哪個密碼屬性。稍後將發佈完整答案。 – hoetz 2011-03-10 08:21:00