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Silverlight的DataInput中：標籤和DataInput中：DescriptionViewer控制通過其結合到一個TextBox能力提供有用的功能。我不想用System.ComponentModel.DataAnnotations.DisplayAttribute對標籤和描述的文本內容進行硬編碼，而寧願將這些屬性綁定到包含管理可編輯文本的類的屬性。這適用於Label，但不適用於DescriptionViewer。結合Silverlight 3中描述屬性：DescriptionViewer
具體來說，這個標籤的工作原理：
<dataInput:Label Grid.Row="00" Grid.Column="0"
Target="{Binding ElementName=inpStatus}"
Content="{Binding StatusLabel}" IsRequired="true" />
但這DescriptionViewer是無形的：
<dataInput:DescriptionViewer Grid.Row="00" Grid.Column="3"
Target="{Binding ElementName=inpStatus}"
Name="dvBound2" Description="{Binding Path=StatusDescription}" />
當我刪除綁定到我的文本框，在DescriptionViewer所示：
<dataInput:DescriptionViewer Grid.Row="00" Grid.Column="2"
Name="dvBound1" Description="{Binding Path=StatusDescription}" />
應該可以將描述查看器綁定到文本框和替代描述來源？
在此先感謝！
MainPage.xaml中：
<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>
MainPage.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
DataClass.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