我在用戶控件中綁定有問題。這是我的用戶控件：用戶控件1.xaml<UserControl x:Class="WpfApp1.UserControl1" 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-ompatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:WpfApp1" mc:Ignorable="d" x:Name="usercontrol" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <TextBox Text="{Binding HmiField, ElementName=usercontrol}"/> </Grid></UserControl>用戶控件1.xaml.csnamespace WpfApp1{ public partial class UserControl1 : UserControl { public double HmiField { get { return (double)GetValue(HmiFieldProperty); } set { SetValue(HmiFieldProperty, value); } } public static readonly DependencyProperty HmiFieldProperty = DependencyProperty.Register("HmiField", typeof(double), typeof(UserControl1)); public UserControl1() { InitializeComponent(); } }}這是主窗口：主窗口.xaml<Window x:Class="WpfApp1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:WpfApp1" mc:Ignorable="d" DataContext="{Binding Md, RelativeSource={RelativeSource Self}}" Title="MainWindow" Height="450" Width="800"> <UniformGrid> <Button Content="{Binding Prop1}" Click="Button_Click"/> <Label Content="{Binding Prop1}"/> <TextBox Text="{Binding Prop1}"/> <local:UserControl1 HmiField="{Binding Prop1}"/> </UniformGrid></Window>
1 回答
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
Binding 必須是 TwoWay，或者顯式設置
<local:UserControl1 HmiField="{Binding Prop1, Mode=TwoWay}"/>
或默認情況下隱式：
public static readonly DependencyProperty HmiFieldProperty =
DependencyProperty.Register(
nameof(HmiField), typeof(double), typeof(UserControl1),
new FrameworkPropertyMetadata(
0d, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
TextBox 的Text屬性注冊如上所示，即帶有BindsTwoWayByDefault標志。
在TextBoxUserControl 的 XAML 中的Binding 中，您可能還想在用戶鍵入時更新源屬性（而不是僅在失去焦點時）：
<TextBox Text="{Binding HmiField,
ElementName=usercontrol,
UpdateSourceTrigger=PropertyChanged}"/>
或者沒有其他無用的生成usercontrol字段：
<TextBox Text="{Binding HmiField,
RelativeSource={RelativeSource AncestorType=UserControl}
UpdateSourceTrigger=PropertyChanged}"/>
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