WPF 组合框中的不同值 [英] Distinct Values in WPF Combobox

问题描述

我想在我的数据绑定组合框中获得不同的值

I would like to get distinct values in my databound combo box

举个例子，它的值是:blue、blue、yellow、red、orange

as an example the values it has are: blue, blue, yellow, red, orange

我希望它只显示蓝色一次.

I would like it to just display blue once.

我的主要想法是将所有组合框值放入一个数组中，将数组设置为不同的，然后重新填充组合框.还有其他办法吗?

My main thought was to get all combo box values into an array, set the array as distinct and then re-populate the combo box. Is there any other way?

如果不是，我将如何从组合框中获取所有值?

If not how would I actually get all the values from the combo box?

谢谢

编辑——类:

public class DistinctConverter : IValueConverter
{

}

编辑——调试:

推荐答案

您可以创建一个 IValueConverter 将您的列表转换为不同的列表:

You could create an IValueConverter that converts your list into a distinct list:

public class DistinctConverter : IValueConverter
{
    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        var values = value as IEnumerable;
        if (values == null)
            return null;
        return values.Cast<object>().Distinct();
    }

    public object ConvertBack(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

将此添加到资源中:

<local:DistinctConverter x:Key="distinctConverter" />

并像这样使用它:

<ComboBox ItemsSource="{Binding Vals, Converter={StaticResource distinctConverter}}" />

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