绑定Silverlight 3 dataInput的描述属性:DescriptionViewer

数据输入:标签 和 数据输入:描述查看器 控件通过绑定到文本框的功能提供了一个有用的功能。与其用System.ComponentModel.DataAnnotations.DisplayAttribute硬编码标签和描述的文本内容,我更愿意将这些属性绑定到包含管理员可编辑文本的类的属性。这适用于Label,但不适用于DescriptionViewer。

具体来说,这个标签的作用是:

<dataInput:Label Grid.Row="00" Grid.Column="0" 
Target="{Binding ElementName=inpStatus}"
Content="{Binding StatusLabel}"  IsRequired="true" />

<dataInput:DescriptionViewer Grid.Row="00" Grid.Column="3" 
Target="{Binding ElementName=inpStatus}" 
Name="dvBound2" Description="{Binding Path=StatusDescription}" /> 

当我移除对文本框的绑定时,将显示DescriptionViewer:

<dataInput:DescriptionViewer Grid.Row="00" Grid.Column="2" 
Name="dvBound1" Description="{Binding Path=StatusDescription}" /> 

是否可以将描述查看器绑定到文本框和其他描述源?

提前谢谢!

主页.xaml:

<UserControl x:Class="DataInputDemo.MainPage"
    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:controlsToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"  
    xmlns:dataInput="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"  
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
  <Grid x:Name="LayoutRoot">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="142"></ColumnDefinition>
            <ColumnDefinition Width="100"/>
            <ColumnDefinition Width="24"></ColumnDefinition>
            <ColumnDefinition Width="24"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"></RowDefinition>
            <RowDefinition Height="30"></RowDefinition>
        </Grid.RowDefinitions>

        <dataInput:Label             Grid.Row="00" Grid.Column="0" 
            Target="{Binding ElementName=inpStatus}"
            Content="{Binding StatusLabel}"  IsRequired="true" />

        <TextBox                     Grid.Row="00" Grid.Column="1" 
            Text="{Binding Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True, Path=Status}"
            Name="inpStatus" MaxLength="025" 
            BindingValidationError="_BindingValidationError" />

        <dataInput:DescriptionViewer Grid.Row="00" Grid.Column="2" 
            Name="dvBound1" Description="{Binding Path=StatusDescription}" />

        <!-- Following DescriptionViewer is not shown. -->
        <dataInput:DescriptionViewer Grid.Row="00" Grid.Column="3" 
            Target="{Binding ElementName=inpStatus}" 
            Name="dvBound2" Description="{Binding Path=StatusDescription}" />

        <dataInput:ValidationSummary Grid.Row="01" Grid.Column="0" 
            Grid.ColumnSpan="4" Name="VS1" />

    </Grid>
</UserControl>

主页.xaml.vb:

Partial Public Class MainPage
    Inherits UserControl

    Public myDataClass = New DataClass

    Public Sub New()
        InitializeComponent()
        myDataClass.status = "Default Status"
        myDataClass.StatusLabel = "Status Label"
        myDataClass.StatusDescription = "Status Description"
        LayoutRoot.DataContext = myDataClass
    End Sub

    Private Sub _BindingValidationError(ByVal sender As Object, ByVal e As ValidationErrorEventArgs)
    End Sub

End Class

数据类.vb:

Imports System.Collections.ObjectModel
Imports System.ComponentModel
Imports System.Runtime.Serialization
Imports System.ComponentModel.DataAnnotations
Imports System.Windows.Controls

Public Class DataClass

    Implements INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler _
        Implements INotifyPropertyChanged.PropertyChanged

    Private Sub NotifyPropertyChanged(ByVal info As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
    End Sub

    Function ValidateEntry(ByVal fieldname As String, ByRef value As Object) As Object
        Dim ctx As New ValidationContext(Me, Nothing, Nothing)
        ctx.MemberName = fieldname
        Validator.ValidateProperty(value, ctx)
        Return value
    End Function

    <DataMember()> _
    <Required()> _
    <StringLength(100)> _
    Public Property Status() As String
        Get
            Return _Status
        End Get
        Set(ByVal value As String)
            _Status = ValidateEntry("Status", value)
            NotifyPropertyChanged("")
        End Set
    End Property
    Private _Status As String

    <DataMember()> _
    Public Property StatusLabel() As String
        Get
            Return _StatusLabel
        End Get
        Set(ByVal value As String)
            _StatusLabel = value
            NotifyPropertyChanged("")
        End Set
    End Property
    Private _StatusLabel As String

    <DataMember()> _
    Public Property StatusDescription() As String
        Get
            Return _StatusDescription
        End Get
        Set(ByVal value As String)
            _StatusDescription = value
            NotifyPropertyChanged("")
        End Set
    End Property
    Private _StatusDescription As String

End Class