将枚举类型绑定到文本框 [英] Binding enum type to textbox

问题描述

我将textbox.text值绑定到枚举类型。
我的枚举看起来像这样

I bind textbox.text value to enum type. My enum looks like that

public enum Type
    {

        Active,

        Selected,

        ActiveAndSelected
    }

我不想做的是在文本框上显示活动模式而不是活动等等。有可能吗？如果我可以在XAML中修改它，那将是很棒的 - 因为我在样式文件style.xaml中的所有绑定

What I wan't to acomplish is to show on textbox "Active Mode" instead of "Active" and so on. Is it possible to do that? It would be great if I could acomplish that in XAML - because all bindings I have in style file style.xaml

我正在尝试使用Description属性，但它似乎是不够

I was trying to use Description attributes but it seems that it's not enough

推荐答案

IMHO使用转换器是一种更好的方法。

IMHO, using a converter is a better approach.

您应该做的第一件事是实现一个简单的属性，以便将一些元数据添加到您的枚举元素中。这是一个基本的例子（没有国际化简单）：

The first thing you should do is implement a simple attribute in order to add some metadata to your enum elements. Here's a basic example (without internationalization for simplicity):

    public enum StepStatus {
    [StringValue("Not done yet")]
    NotDone,
    [StringValue("In progress")]
    InProgress,
    [StringValue("Failed")]
    Failed,
    [StringValue("Succeeded")]
    Succeeded
}

旁边您可以编写一个实用程序类，可以使用反射将枚举元素转换为相应的StringValue表示形式。在Google中搜索C＃ - CodeProject中的字符串枚举，您会发现CodeProject关于这个的文章（抱歉，我的低声誉不会让我添加链接..）

Next to that, you can write a utility class able to convert from an enum element to its corresponding StringValue representation using reflection. Search in Google for "String Enumerations in C# - CodeProject" and you'll find CodeProject's article about this (sorry, my low reputation won't let me add the link..)

现在，您可以实现一个转换器，只需将转换委托给实用程序类：

Now you can implement a converter that simply delegates the conversion to the utility class:

    [ValueConversion(typeof(StepStatus), typeof(String))]
public class StepStatusToStringConverter: IValueConverter {
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture){
        String retVal = String.Empty;

        if (value != null && value is StepStatus) {
            retVal = StringEnum.GetStringValue((StepStatus)value);
        }

        return retVal;
    }

    /// <summary>
    /// ConvertBack value from binding back to source object. This isn't supported.
    /// </summary>
    public object ConvertBack(object value, Type targetType,
        object parameter, CultureInfo culture) {
        throw new Exception("Can't convert back");
    }
}

最后，您可以在XAML代码中使用转换器：

Finally, you can use the converter in your XAML code:

<resourceWizardConverters:StepStatusToStringConverter x:Key="stepStatusToStringConverter" />
...
<TextBox Text="{Binding Path=ResourceCreationRequest.ResourceCreationResults.ResourceCreation, Converter={StaticResource stepStatusToStringConverter}}" ... />

检查以下页面;它给了一个支持国际化的例子，但基本上原则是一样的。

Check the following page; it gives an example that supports internationalization, but basically the principle is the same..

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