我添加了一个WPF自定义控件并使其从ItemsControl派生。该类称为IC4,声明如下:
public class IC4 : ItemsControl
我添加了以下属性:
public class P
{
public string S { get; set; }
public string T { get; set; }
}
public List<P> LP { get; set; } = new List<P>();
然后在构造函数中执行以下操作:
public IC4()
{
LP.Add(new P { S = "fred", T = "jim" });
LP.Add(new P { S = "fred", T = "jim" });
this.ItemsSource = LP;
this.DataContext = this;
}
Visual Studio在themes / generic.xaml中添加了一个样式条目 - 我已将其修改如下:
<Style TargetType="{x:Type local:IC4}">
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<!-- this is almost certainly wrong: -->
<TextBlock Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=S}"/>
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:IC4}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<ItemsPresenter/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
在mainwindow.xaml中,我添加了:
<StackPanel>
<Label Content="before"/>
<local:IC4 ItemsSource="{Binding LP}"/>
<Label Content="after"/>
</StackPanel>
我很确定数据模板中Textbox的绑定不正确,因为我收到以下运行时错误(显示在输出窗口中):
System.Windows.Data Error: 40 : BindingExpression path error: 'S' property not found on 'object' ''ContentPresenter' (Name='')'. BindingExpression:Path=S; DataItem='ContentPresenter' (Name=''); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')
如何设置绑定以显示LP属性的S元素?
(请注意,为了简单起见,我对属性更改通知不感兴趣。)
由于
答案 0 :(得分:2)
据我所知,它应该只是
<DataTemplate>
<Grid>
<TextBlock Text="{Binding Path=S}"/>
</Grid>
</DataTemplate>
每个项目的 DataContext
,因此ItemTemplate
中的所有内容都是P
类的实例,所以您需要指定的是Path