C# 如何使 ListBox.ItemTemplate 可重用/通用
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How to make a ListBox.ItemTemplate reusable/generic
提问by Matt Winckler
I am trying to understand how best to extend the ListBoxcontrol. As a learning experience, I wanted to build a ListBoxwhose ListBoxItems display a CheckBoxinstead of just text. I got that working in a basic fashion using the ListBox.ItemTemplate, explicitly setting the names of the properties I wanted to databind to. An example is worth a thousand words, so...
我试图了解如何最好地扩展ListBox控制。作为学习经验，我想构建一个ListBoxwho ListBoxItems 显示 aCheckBox而不仅仅是文本。我使用 以基本方式工作ListBox.ItemTemplate，显式设置我想要数据绑定到的属性的名称。一个例子胜过一千个字，所以……
I've got a custom object for databinding:
我有一个用于数据绑定的自定义对象：
public class MyDataItem {
public bool Checked { get; set; }
public string DisplayName { get; set; }
public MyDataItem(bool isChecked, string displayName) {
Checked = isChecked;
DisplayName = displayName;
}
}
(I build a list of those and set ListBox.ItemsSourceto that list.) And my XAML looks like this:
（我构建了一个列表并设置ListBox.ItemsSource为该列表。）我的 XAML 如下所示：
<ListBox Name="listBox1">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding Path=Checked}" Content="{Binding Path=DisplayName}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
This works. But I want to make this template reusable, i.e. I'll want to bind to other objects with properties other than "Checked" and "DisplayName". How can I modify my template such that I could make it a resource, reuse it on multiple ListBoxinstances, and for each instance, bind IsCheckedand Contentto arbitrary property names?
这有效。但我想让这个模板可重用，即我想绑定到具有“Checked”和“DisplayName”以外的属性的其他对象。如何修改我的模板，这样我可以让它变成一个资源，再用它在多个ListBox实例，每个实例，绑定IsChecked和Content任意属性名称？
采纳答案by Bryan Anderson
The easiest way is probably to put the DataTemplateas a resourcesomewhere in your application with a TargetTypeof MyDataItemlike this
最简单的方法可能是将资源DataTemplate作为资源放在您的应用程序中的某个地方TargetType，MyDataItem就像这样
<DataTemplate DataType="{x:Type MyDataItem}">
<CheckBox IsChecked="{Binding Path=Checked}" Content="{Binding Path=DisplayName}" />
</DataTemplate>
You'll probably also have to include an xmlnsto your local assembly and reference it through that. Then whenever you use a ListBox(or anything else that uses a MyDataItemin a ContentPresenteror ItemsPresenter) it will use this DataTemplateto display it.
您可能还必须xmlns在本地程序集中包含一个并通过它引用它。然后，每当您使用 a ListBox（或MyDataItem在 aContentPresenter或中使用 a 的任何其他内容ItemsPresenter）时，它将使用它DataTemplate来显示它。
回答by MrTelly
Create your DataTemplate as a resource and then reference it using the ItemTemplate property of the ListBox. MSDN has a good example
创建您的 DataTemplate 作为资源，然后使用 ListBox 的 ItemTemplate 属性引用它。MSDN有一个很好的例子
<Windows.Resources>
<DataTemplate x:Key="yourTemplate">
<CheckBox IsChecked="{Binding Path=Checked}" Content="{Binding Path=DisplayName}" />
</DataTemplate>
...
</Windows.Resources>
...
<ListBox Name="listBox1"
ItemTemplate="{StaticResource yourTemplate}"/>
回答by Jake Ginnivan
If you wanted one way display then you could use a converter:
如果您想要一种方式显示，那么您可以使用转换器：
class ListConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return ((IList<MyDataItem>)value).Select(i => new { Checked = i.Checked2, DisplayName = i.DisplayName2 });
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
Then the xaml would look something like this:
然后 xaml 看起来像这样：
<Window.Resources>
<this:ListConverter x:Key="ListConverter" />
</Window.Resources>
<ListBox ItemsSource="{Binding Path=Items, Converter={StaticResource ListConverter}}">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding Path=Checked, Mode=OneWay}" Content="{Binding Path=DisplayName, Mode=OneWay}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
That data template you could make generic like above. Two way binding would be a fair bit more difficult.
你可以像上面那样通用的数据模板。双向绑定会有点困难。
I think you are better off making your base classes implement a ICheckedItem interface which exposes the generic properties that you want the datatemplates to bind to?
我认为您最好让您的基类实现一个 ICheckedItem 接口，该接口公开您希望数据模板绑定到的通用属性？
