这是Windows Phone 8.1(运行时)
我在将自定义用户控件与数据列表绑定时遇到了一些问题。我会尽我所能让它变得简单。
我的问题是,如果我在自定义控件中使用DataBind{Binding Something},它将无法工作。
我需要将绑定的数据(字符串)传输到自定义控件。
奇怪的是,如果我不使用DataBind,它将正常工作。例如MyCustomControllParameter="某个字符串"(在我的示例中为"BindingTextValue"属性)
有人知道如何用DataTemplate将自定义用户控件与内部ListView绑定吗。
假设:
XAML测试主页
<Grid Background="Black">
<ListView x:Name="TestList" Background="#FFEAEAEA">
<ListView.ItemTemplate>
<DataTemplate>
<Grid Background="#FF727272">
<local:TextBoxS BindingTextValue="{Binding Tag, FallbackValue='aSource'}" local:TextBoxS>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
XAML测试主页c#
public sealed partial class MainPage : Page
{
List<TTag> tags = new List<TTag>();
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
}
public class TTag
{
public string Tag { get; set; }
}
private void InitializeAppData()
{
TTag tag = new TTag() { Tag = "hello world" };
tags.Add(tag);
tags.Add(tag);
tags.Add(tag);
TestList.ItemsSource = tags;
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
InitializeAppData();
}
}
用户控件XAML:
<UserControl
x:Class="CustomControllTest.TextBoxS"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:CustomControllTest"
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">
<Grid x:Name="LayoutRoot" Background="#FF4F4F4F" >
<RichTextBlock x:Name="MyTestBlock">
</RichTextBlock>
</Grid>
用户控制c#.cs
public TextBoxS()
{
this.InitializeComponent();
LayoutRoot.DataContext = this;
}
public static readonly DependencyProperty BindingTextValueProperty = DependencyProperty.Register(
"BindingTextValue",
typeof(string),
typeof(TextBoxS),
new PropertyMetadata(default(string)));
public string BindingTextValue
{
get
{
return GetValue(BindingTextValueProperty) as string;
}
set
{
SetValue(BindingTextValueProperty, value);
//This method adds some custom logic into RichTextBlock, pointed correctly
SetupSpotterBox(value);
}
}
感谢您的帮助;)
您需要设置MainPage的DataContext,因为它没有在的任何地方设置
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
this.DataContext = this;
}
下一步从UserControl 中删除以下行
this.DataContext = this;
这是为了允许您的用户控件选择正确的DataContext,例如MainPages
最后,对UserControl xaml 进行一些更改
<UserControl
x:Class="App21.TextBoxS"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App21"
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">
<TextBlock x:Name="MyTestBlock" FontSize="22"
Text="{Binding ElementName=root, Path=BindingTextValue}" Foreground="Red">
</TextBlock>
</Grid>
注意控件本身的x:Name="root",我使用了一个TextBlock,这样我就可以使用ElementName和Dependency property BondingTextValue显示Binding to Text属性。
您不必更新属性Setter中的控件。试试这个代码:
public static readonly DependencyProperty BindingTextValueProperty = DependencyProperty.Register(
"BindingTextValue",
typeof(string),
typeof(TextBoxS),
new PropertyMetadata(default(string), PropertyChangedCallback));
private static void PropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args) {
//This method adds some custom logic into RichTextBlock, pointed correctly
var textBoxS = dependencyObject as TextBoxS;
textBoxS.SetupSpotterBox((string) args.NewValue);
}
public string BindingTextValue
{
get { return GetValue(BindingTextValueProperty) as string; }
set { SetValue(BindingTextValueProperty, value); }
}