Question

我在视图模型中有一个枚举，在xaml中有一个组合框

<TextBlock>Profession</TextBlock>                     
<TextBox Name="txtSpec" Text="{Binding Speciality}" />
<ComboBox Name="cmbSpec" SelectedIndex="{Binding ElementName=txtSpec, Path=Text, Converter={StaticResource EnumConverter}, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}">
    <ComboBoxItem>Software engineer</ComboBoxItem>
    <ComboBoxItem>Mechanic</ComboBoxItem>
</ComboBox>

txtSpec绑定专业。当组合框选择发生变化时，txtSpec的文本会发生变化，但不会通知该属性已更改。我无法确定对象是否脏。我的代码有什么问题？感谢。

我通过

解决了这个问题

<Window.Resources>
    <local:Converter x:Key="EnumConverter" />
</Window.Resources>
...

<ComboBox Name="cmbSpec" SelectedIndex="{Binding Speciality, Converter={StaticResource EnumConverter}}">
    <ComboBoxItem>Software engineer</ComboBoxItem>
    <ComboBoxItem>Mechanic</ComboBoxItem>

</ComboBox>

...

[ValueConversion(typeof(object), typeof(string))]
public class Converter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (int)((Specialist)value);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (Specialist)value;
    }
}

Answer 1

您是否尝试过 TwoWay 绑定模式？

SelectedIndex="{Binding ElementName=txtSpec, Path=Text, Mode=TwoWay"}

Answer 2

您是否尝试将SelectedIndex简单地绑定到Speciality？

<TextBlock>Profession</TextBlock>                     
<TextBox Name="txtSpec" Text="{Binding Speciality}" />
<ComboBox Name="cmbSpec" SelectedIndex="{Binding Speciality, Converter={StaticResource EnumConverter}}">
    <ComboBoxItem>Software engineer</ComboBoxItem>
    <ComboBoxItem>Mechanic</ComboBoxItem>
</ComboBox>

在我看来，这是实现同一目标的一种更直接的模式。

WPF绑定到绑定的元素

2 个答案: