通过用户控件进行WPF数据绑定
本文关键字:WPF 数据绑定 控件 用户 | 更新日期: 2023-09-27 17:54:51
我想从主窗口的DataContext绑定属性,上面你可以看到我的UserControls和models。我想绑定model。id。标签1和型号idLabel2属性到main_id/card_1/top和main_id/card_1/bottom控件。我希望你讲清楚了。如果我启用ref_lbl标签它将显示"lbl1",card_2仍然与硬编码文本一起工作,但card_1将为空白。我需要修改什么来固定card_1上的绑定?
我有一个ID UserControl,它包含另一个UserControl。
XAML:<UserControl x:Class="stack.ID"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:Controls="clr-namespace:stack.Controls"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="1*" />
<RowDefinition Height="1*" />
</Grid.RowDefinitions>
<Label Name="ref_lbl" Grid.Row="0" Content="{Binding Label1}" Visibility="Collapsed" />
<Controls:Card x:Name="card_1" Grid.Row="0" TopLabel="{Binding Label1}" BottomLabel="{Binding Label2}" />
<Controls:Card x:Name="card_2" Grid.Row="1" TopLabel="Text 1" BottomLabel="Text 2" />
</Grid>
后台代码:默认,自动生成
这是Card UserControl.
XAML:<UserControl x:Class="stack.Controls.Card"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="1*" />
<RowDefinition Height="1*" />
</Grid.RowDefinitions>
<Label Grid.Row="0" FontSize="20" Foreground="Black" HorizontalAlignment="Center" VerticalAlignment="Center" Content="{Binding TopLabel}" />
<Label Grid.Row="1" FontSize="20" Foreground="Black" HorizontalAlignment="Center" VerticalAlignment="Center" Content="{Binding BottomLabel}" />
</Grid>
背后的代码:
namespace stack.Controls
{
public partial class Card : UserControl
{
public static readonly DependencyProperty TopLabelProperty = DependencyProperty.Register("TopLabel", typeof(string), typeof(Card), new PropertyMetadata(default(string)));
public static readonly DependencyProperty BottomLabelProperty = DependencyProperty.Register("BottomLabel", typeof(string), typeof(Card), new PropertyMetadata(default(string)));
public Card()
{
InitializeComponent();
}
public string TopLabel
{
get
{
return (string)GetValue(TopLabelProperty);
}
set
{
SetValue(TopLabelProperty, value);
}
}
public string BottomLabel
{
get
{
return (string)GetValue(BottomLabelProperty);
}
set
{
SetValue(BottomLabelProperty, value);
}
}
}
}
这是我的主窗口。
XAML:<Window x:Class="stack.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:stack"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<local:Model />
</Window.DataContext>
<Grid>
<local:ID x:Name="main_id" DataContext="{Binding ID}" />
</Grid>
后台代码:默认,自动生成
我也有两个模型。
namespace stack
{
public class IDModel
{
private string label1 = "lbl1";
private string label2 = "lbl2";
public string Label1
{
get
{
return label1;
}
set
{
label1 = value;
}
}
public string Label2
{
get
{
return label2;
}
set
{
label2 = value;
}
}
}
public class Model
{
private IDModel id = new IDModel();
public IDModel ID
{
get
{
return id;
}
set
{
id = value;
}
}
}
}
删除
DataContext="{Binding RelativeSource={RelativeSource Self}}"
from the Card
's XAML.
它防止从它的父控件ID
继承DataContext,这在您编写
<Controls:Card ... TopLabel="{Binding Label1}" />
在Card
的XAML中这样写Content
绑定:
<Label ... Content="{Binding TopLabel,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" />