Question

我有一个自制的按钮，有图像和文字。

<ButtonImageApp:ButtonImage   
BText="Button"

这很好用。但是，当我尝试进行绑定时，我的按钮代码被破坏了。

这不行。

BText="{Binding Path=LocalizedResources.PlayButton, Source={StaticResource LocalizedStrings}}"

XAML

<Button x:Class="ButtonImageApp.ButtonImage"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        IsEnabledChanged="ButtonIsEnabledChanged"
        MouseEnter="ButtonMouseEnter"
        MouseLeave="ButtonMouseLeave">

    <Grid>
        <Image Stretch="None"
           HorizontalAlignment="Center"
           VerticalAlignment="Center"
               Grid.Row="0" Grid.Column="0"
           x:Name="image" />
        <TextBlock x:Name="txtButtonText"  
            Foreground="Black"             
            Text="{Binding Path=BText}"
            Grid.Row="0" Grid.Column="0" 
            Margin="20,51,0,-51" TextAlignment="Center"></TextBlock>
    </Grid>
</Button>

守则：

public static readonly DependencyProperty ButtonText = DependencyProperty.Register("BText", typeof(string), typeof(ButtonImage), null);
public string BText
{
    get { return (string)GetValue(ButtonText); }

    set
    {
        SetValue(ButtonText, value);
        txtButtonText.Text = value;
    }
}

Answer 1

问题是当使用绑定时，不会调用属性的setter。
相反，您需要注册更改的依赖项属性：

public static readonly DependencyProperty ButtonText = DependencyProperty.Register("BText", typeof(string), typeof(ButtonImage), new PropertyMetadata(ButtonTextChanged));

    private static void ButtonTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        txtButtonText.Text = e.NewValue;
    }

绑定到自定义按钮

1 个答案: