[UWP] [VB] [XAML]刷新ContentControl [英] [UWP][VB][XAML]Refreshing a ContentControl

问题描述

我有一个ContentControl。用于ContentTemplate的DataTemplate包含ItemsControl（当然还有其他几个控件），我当然有一个DataTemplate作为ItemTemplate。 ItemsControl的ItemsSource绑定到ContentControl内容的属性
。当我更新ContentControl的内容时，我当然希望更改显示在页面上。但是，即使更新了内容，也不会显示更改。如何让ContentControl显示
更新？谢谢。

---

Nathan Sokalski [e-mail] http://www.nathansokalski.com/

解决方案

< blockquote>

Nathan Sokalski，

>>"当我更新ContentControl的内容时，我当然希望更改显示在页。但是，即使更新了内容，也不会显示更改。如何让ContentControl显示更新？"

请检查您是否为您的类实现了INotifyPropertyChanged接口。由于我没有看到您的代码，因此很难帮助您诊断问题。您最好在此处发布一个简单的可重现代码示例。

无论如何，请检查我的以下代码示例，它在我身边运作良好。

< StackPanel> ; 
< ContentControl x：Name =" contentControl"> 
< ContentControl.ContentTemplate> 
< DataTemplate> 
< ItemsControl ItemsSource =" {Binding tests}"> 
< ItemsControl.ItemTemplate> 
< DataTemplate> 
< TextBlock Text =" {Binding Name}">< / TextBlock> 
< / DataTemplate> 
< /ItemsControl.ItemTemplate> 
< / ItemsControl> 
< / DataTemplate> 
< /ContentControl.ContentTemplate> 
< / ContentControl> 
 
< Button Content =" update"点击= QUOT; Button_Click">< /按钮> 
< / StackPanel> 

 Public NotInheritable Partial Class MainPage 
 Inherits Page 
 
私有属性测试As ObservableCollection（Of Test）
 
 Public Sub New（）
 Me.InitializeComponent（）
 tests = New ObservableCollection（Of Test）（）
 tests .Add（New Test（）with {
 .Name =" name1" 
}）
 tests.Add（New Test（）With {
 .Name =" name2" ; 
}）
 contentControl.Content = New With {tests 
} 
 End Sub 
 
 Private Sub Button_Click（ByVal sender As Object，ByVal e As RoutedEventArgs）
 tests（0）.Name =" _name1" 
结束次级
结束类

公共类测试
继承INotifyPropertyChanged 
 
公共事件PropertyChanged As PropertyChangedEventHandler 
 
 Private Sub RaisePropertyChanged（ByVal PropertyName As String）
 RaiseEvent PropertyChanged（Me，New PropertyChangedEventArgs（PropertyName））
 End Sub 
 
 Private _Name As String 
 
公共属性名称字符串
获取
返回_Name 
结束获取
设置（ByVal值为字符串）
 _Name = value 
 RaisePropertyChanged（" Name"）
 End Set 
 End Property 
 End Class 

最好的问候，

Xavier Xie

I have a ContentControl. The DataTemplate used for the ContentTemplate contains an ItemsControl (and several other controls, of course), for which I of course have a DataTemplate as the ItemTemplate. The ItemsSource for the ItemsControl is bound to a property of the ContentControl's Content. When I update the Content of the ContentControl I of course want the change to be shown on the page. However, the change is not being displayed even though the Content is updated. How can I make the ContentControl show the update? Thanks.

---

Nathan Sokalski [e-mail] http://www.nathansokalski.com/

解决方案

Hi Nathan Sokalski,

>>" When I update the Content of the ContentControl I of course want the change to be shown on the page. However, the change is not being displayed even though the Content is updated. How can I make the ContentControl show the update?"

Please check if you’ve implemented the INotifyPropertyChanged interface for your class. Since I did not see your code, It’s hard to help you diagnose your issue. You’d better post a simple reproducible code sample here.

Anyway, please check my following code sample, it worked well on my side.

<StackPanel>
        <ContentControl x:Name="contentControl">
            <ContentControl.ContentTemplate>
                <DataTemplate>
                    <ItemsControl ItemsSource="{Binding tests}">
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding Name}"></TextBlock>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </DataTemplate>
            </ContentControl.ContentTemplate>
        </ContentControl>

        <Button Content="update" Click="Button_Click"></Button>
    </StackPanel>

Public NotInheritable Partial Class MainPage
    Inherits Page

    Private Property tests As ObservableCollection(Of Test)

    Public Sub New()
        Me.InitializeComponent()
        tests = New ObservableCollection(Of Test)()
        tests.Add(New Test() With {
            .Name = "name1"
        })
        tests.Add(New Test() With {
            .Name = "name2"
        })
        contentControl.Content = New With {tests
        }
    End Sub

    Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
        tests(0).Name = "_name1"
    End Sub
End Class

Public Class Test
    Inherits INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler

    Private Sub RaisePropertyChanged(ByVal PropertyName As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(PropertyName))
    End Sub

    Private _Name As String

    Public Property Name As String
        Get
            Return _Name
        End Get
        Set(ByVal value As String)
            _Name = value
            RaisePropertyChanged("Name")
        End Set
    End Property
End Class

Best Regards,

Xavier Xie

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