WPF IValueConverter - 将多个值转换为单个值

Question

WPF IValueConverter - 将多个值转换为单个值

5

我现在正在维护别人的代码，那个人是WPF专家，而我不是。 :) 该代码使用IValueConverter将状态枚举值转换为布尔值，以控制屏幕上是否显示UserControl。我发现一个缺点，单个枚举在这种情况下是不够的，还需要考虑另一个布尔值。是否有另一个对象可以使用，需要将2个项作为参数进行转换？（“转换器”参数已经被使用。）一个快速的例子如下。现有代码的逻辑是...

If it's sunny, go to work.
If it's raining, don't go to work.

我需要考虑另一件事情，这会使它变成以下形式。

If it's sunny and you're wearing pants, go to work.
If it's sunny and you're not wearing pants, don't go to work.
If it's raining and you're wearing pants, don't go to work.
If it's raining and you're not wearing pants, don't go to work.

IValueConverter 只允许我将一个“东西”进行转换。任何帮助将不胜感激。谢谢，mj

- mj_

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Rachel · Accepted Answer

使用一个 IMultiValueConverter

public class MyMultiValueConverter: IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        // Do something with the values array. It will contain your parameters
    }

    public object[] ConvertBack(object values, Type[] targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

你还需要在XAML中使用MultiBinding而不是普通的绑定。

<MultiBinding Converter="{StaticResource MyMultiValueConverterKey}">
    <Binding Path="Value1" />
    <Binding Path="Value2" />
</MultiBinding>