Question

我有一个依赖属性，它是基于文本框的自定义控件的一部分：在wpf 4.5，vb.net 4.5，visual studio 2012中。

这是财产声明：

#Region "DEPENDENCY PROPERTIES -- ItemsSource"
    Public Property ItemsSource As IEnumerable
        Get
            Return GetValue(ItemsSourceProperty)
        End Get
        Set(ByVal value As IEnumerable)
            SetValue(ItemsSourceProperty, value)
        End Set
    End Property
    Public ReadOnly ItemsSourceProperty As DependencyProperty = DependencyProperty.Register( _
                    "ItemsSource", GetType(DependencyObject), GetType(AutoCompleteTextBox), _
                    New FrameworkPropertyMetadata(Nothing, FrameworkPropertyMetadataOptions.None, _
                    New PropertyChangedCallback(AddressOf OnItemSourceChanged)))
#End Region

然后我在一个小样本项目中声明自定义控件进行测试（自定义控件在同一个魂中的另一个项目中）

以下是带有自定义控件的主窗口的xaml：

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:krisis="clr-namespace:Krisis.Controls;assembly=Krisis.Controls"
    Title="MainWindow" Height="350" Width="525" x:Name="MyWindow"
    DataContext="{Binding RelativeSource={RelativeSource Self}}">
    <Grid>
        <krisis:AutoCompleteTextBox ItemsSource="{Binding Collection, Mode=TwoWay}"  Width="497" MinHeight="35" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,41,10,243"/>
    </Grid>
</Window>

但是xaml编辑器强调了customcontrol行并抛出以下错误：

错误1无法在'ItemsSource'属性上设置'绑定' 输入'AutoCompleteTextBox'。 '绑定'只能在a上设置 DependencyObject的DependencyProperty。

有人可以帮我解决导致此错误的原因，我无法弄清楚我的依赖属性声明在哪里出错。

Answer 1

DependencyProperty Shared或VB中的Static

} C#必须是

Public Property ItemsSource As IEnumerable
    Get
        Return GetValue(ItemsSourceProperty)
    End Get
    Set(ByVal value As IEnumerable)
        SetValue(ItemsSourceProperty, value)
    End Set
End Property

Public Shared ReadOnly ItemsSourceProperty As DependencyProperty = DependencyProperty.Register( _
                "ItemsSource", GetType(DependencyObject), GetType(AutoCompleteTextBox), _
                New FrameworkPropertyMetadata(Nothing, FrameworkPropertyMetadataOptions.None, _
                New PropertyChangedCallback(AddressOf OnItemSourceChanged)))

示例：

{{1}}

来自自定义控件的wpf依赖项属性错误

1 个答案: