Question

我试图根据数据源中的颜色更改表单控件的背景颜色。我没有任何转换就能使绑定工作。如何使用我写过的IValueConverter来做同样的事情？

没有转换的示例绑定：

this.panel1.DataBindings.Add(new Binding(
                "BackColor",
                dataSource,
                "selectedColor",
                false,
                DataSourceUpdateMode.OnPropertyChanged));

Answer 1

例如：

<UserControl myControls="clr-namespace:MyProjectRef">

    <UserControl.Resources>

        <myControls:MyValueConverter x:Key="myConverter"/>

    </UserControl.Resources>

    <Grid Background="{Binding MyCurrentBackgroundProperty, Converter={StaticResource myConverter}}"/>

</UserControl>

编辑1：

抱歉，我没有看到这是Windows窗体问题。

使用绑定上的Format和Parse事件来有效创建数值转换器。

Binding backgroundBinding = new Binding("BackColor", dataSource, "selectedColor", false, DataSourceUpdateMode.OnPropertyChanged);

backgroundBinding.Parse += OnParseBackgroundBinding;
backgroundBinding.Format += OnFormatBackgroundBinding;

this.panel1.DataBindings.Add(backgroundBinding);

private void OnParseBackgroundBinding(object sender, ConvertEventArgs args)
{
    // this is called when the value of the binding changes
    Color background = (Color)args.Value;

    // do your conversion here...
    args.Value = ...
}

private void OnFormatBackgroundBinding(object sender, ConvertEventArgs args)
{
    // this is called when the property of the binding changes

    // do conversion here if necessary...
}

如何使用IValueConverter将Windows窗体控件绑定到数据

1 个答案: