如何计算 WPF 绑定中的值

发布于 2024-10-18 20:33:13 字数 1366 浏览 2 评论 0原文

我有一个应用程序，它使用两个滑块来生成在代码中其他地方使用的产品。我想要的是将产品值绑定到文本块或工具提示，例如，看起来像“10 x 15 = 150”。

第一部分很简单，看起来像这样：

<TextBlock.Text>
    <MultiBinding StringFormat="{}{0} x {1}">
        <Binding ElementName="amount_slider" Path="Value" />
        <Binding ElementName="frequency_slider" Path="Value"/>
    </MultiBinding>
</TextBlock.Text>

但是有什么简单的方法可以将产品放入其中呢？

使用 Pavlo Glazkov 的解决方案，我将其修改为如下所示：

public class MultiplyFormulaStringConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var doubleValues = values.Cast<double>().ToArray();
        double x = doubleValues[0];
        double y = doubleValues[1];
        var leftPart = x.ToString() + " x " + y.ToString();
        var rightPart = (x * y).ToString();
        var result = string.Format("{0} = {1}", leftPart, rightPart);
        return result;
    }

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

最重要的是

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

谢谢！

原文

I have an app which uses two sliders to generate a product used elsewhere in the code. What I would like is to have the product value bound to a textblock or tooltip, for example, to look something like "10 x 15 = 150".

The first part is easy, and looks like this:

<TextBlock.Text>
    <MultiBinding StringFormat="{}{0} x {1}">
        <Binding ElementName="amount_slider" Path="Value" />
        <Binding ElementName="frequency_slider" Path="Value"/>
    </MultiBinding>
</TextBlock.Text>

But what's a nice easy way to get the product in there as well?

Using Pavlo Glazkov's solution, I modified it to look like this:

public class MultiplyFormulaStringConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var doubleValues = values.Cast<double>().ToArray();
        double x = doubleValues[0];
        double y = doubleValues[1];
        var leftPart = x.ToString() + " x " + y.ToString();
        var rightPart = (x * y).ToString();
        var result = string.Format("{0} = {1}", leftPart, rightPart);
        return result;
    }

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

And the all-important

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

Thanks!

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野の 2024-10-25 20:33:13

创建一个转换器，而不是使用 StringFormat。像这样的东西：

public class MultiplyFormulaStringConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var doubleValues = values.Cast<double>().ToArray();

        var leftPart = string.Join(" x ", doubleValues);

        var rightPart = doubleValues.Sum().ToString();

        var result = string.Format("{0} = {1}", leftPart, rightPart);

        return result;
    }

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

<TextBlock.Text>
    <MultiBinding Converter="{StaticResource MultiplyFormulaStringConverter}">
        <Binding ElementName="amount_slider" Path="Value" />
        <Binding ElementName="frequency_slider" Path="Value"/>
    </MultiBinding>
</TextBlock.Text>

Instead of using StringFormat create a converter. Something like this:

public class MultiplyFormulaStringConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var doubleValues = values.Cast<double>().ToArray();

        var leftPart = string.Join(" x ", doubleValues);

        var rightPart = doubleValues.Sum().ToString();

        var result = string.Format("{0} = {1}", leftPart, rightPart);

        return result;
    }

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

<TextBlock.Text>
    <MultiBinding Converter="{StaticResource MultiplyFormulaStringConverter}">
        <Binding ElementName="amount_slider" Path="Value" />
        <Binding ElementName="frequency_slider" Path="Value"/>
    </MultiBinding>
</TextBlock.Text>

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