C# 如何在WPF C中将组合框绑定到字典

我正在尝试将一个组合框绑定到字典，并在WPF中的当前选定对象中显示一个特定字段

我想在组合框中显示什么：我将执行它是初始选中的 我会做的 我不会做的 我可能会这么做

当前实际显示的内容：初始未选择任何内容 [是，回答显示项目] [否，回答显示项目] [可能，回答显示项]

这是我的密码：

public enum Answer { YES, NO, MAYBE}

public class AnswerDisplayItem
{
    public string DisplayName { get; }
    public string DisplayDescription { get; }
    public AnswerDisplayItem(string displayName, string displayDescription)
    {
        DisplayName = displayName;
        DisplayDescription = displayDescription;
    }
}


public class MyViewModel()
{
    public MyViewModel() 
    {
        AnswerDisplay = new Dictionary<Answer, AnswerDisplayItem>
        {
            {Answer.YES, new AnswerDisplayItem("Yes", "I will do it") },
            {Answer.NO, new AnswerDisplayItem("No", "I will not do it")},
            {Answer.MAYBE, new AnswerDisplayItem("Maybe", "I might do it")}
        };
        SelectedAnswer = Answer.Yes;
    }


    public Dictionary<Answer, AnswerDisplayItem> AnswerDisplay{ get; private set; }

    private Answer _selectedAnswer;
    public Answer SelectedAnswer
    {
        get
        {
            return _selectedAnswer;
        }
        set
        {
            if (_selectedAnswer != value)
            {
                _selectedAnswer = value;
                RaisePropertyChanged();
            }
        }
    }
}

XAML：

使用字典不需要另一门课

AnswerDisplay = new Dictionary<Answer, string>
{
    {Answer.YES, "I will do it"},
    {Answer.NO,  "I will not do it"},
    {Answer.MAYBE, "I might do it"},
};

使现代化 如果要使用词典，请将绑定更改为

<ComboBox ItemsSource="{Binding AnswerDisplay}" 
          DisplayMemberPath="Value.DisplayDescription"
          SelectedValuePath="Key"
          SelectedValue="{Binding SelectedAnswer}"/>

---

通过绑定到从enum生成的键值属性，可以轻松实现所需的功能：

定义枚举：

 public enum DateModes
{
    [Description("DAYS")]
    Days,
    [Description("WKS")]
    Weeks,
    [Description("MO")]
    Month,
    [Description("YRS")]
    Years
 }

下面的helper方法将返回键值对

 public static string Description(this Enum eValue)
    {
        var nAttributes = eValue.GetType().GetField(eValue.ToString()).GetCustomAttributes(typeof(DescriptionAttribute), false);
        if (nAttributes.Any())
        {
            var descriptionAttribute = nAttributes.First() as DescriptionAttribute;
            if (descriptionAttribute != null)
                return descriptionAttribute.Description;
        }

        // If no description is found, the least we can do is replace underscores with spaces
        TextInfo oTI = CultureInfo.CurrentCulture.TextInfo;
        return oTI.ToTitleCase(oTI.ToLower(eValue.ToString().Replace("_", " ")));
    }     
public static IEnumerable<KeyValuePair<string, string>> GetAllValuesAndDescriptions<TEnum>() where TEnum : struct, IConvertible, IComparable, IFormattable
    {
        if (!typeof(TEnum).IsEnum)
        {
            throw new ArgumentException("TEnum must be an Enumeration type");
        }

        return from e in Enum.GetValues(typeof(TEnum)).Cast<Enum>()
               select new KeyValuePair<string, string>(e.ToString(), e.Description());
    }

ViewModel或DataContext中的属性：

公共IEnumerable日期模式 { 获取{返回EnumHelper.GetAllValuesAndDescriptions；} }

视图中的绑定：

                  <ComboBox 
                      ItemsSource="{Binding DateModes}"
                      SelectedValue="{Binding SelectedDateDisplay}"
                      DisplayMemberPath="Value"
                      SelectedValuePath="Key"
                      VerticalAlignment="Top"/>

---

您只想显示枚举的description属性。我觉得这个方法会更干净。

字典包含一个KeyValuePair集合，该集合具有Key和Value属性。绑定该属性。顺便说一句，字典应该做这项工作。不过这是我的观点，我不想使用字典。我想要一个AnswerDisplayItem，因为我需要在视图模型中访问其他字段。在这种情况下，无论我做什么，我似乎都无法正确绑定。没有必要，但可以使用字典，因为我们的答案是有意义的。我仍然没有得到预期的结果，尽管组合框值现在已经初始化。嗯，我的组合框的样式可能有错误。。。

 public static string Description(this Enum eValue)
    {
        var nAttributes = eValue.GetType().GetField(eValue.ToString()).GetCustomAttributes(typeof(DescriptionAttribute), false);
        if (nAttributes.Any())
        {
            var descriptionAttribute = nAttributes.First() as DescriptionAttribute;
            if (descriptionAttribute != null)
                return descriptionAttribute.Description;
        }

        // If no description is found, the least we can do is replace underscores with spaces
        TextInfo oTI = CultureInfo.CurrentCulture.TextInfo;
        return oTI.ToTitleCase(oTI.ToLower(eValue.ToString().Replace("_", " ")));
    }     
public static IEnumerable<KeyValuePair<string, string>> GetAllValuesAndDescriptions<TEnum>() where TEnum : struct, IConvertible, IComparable, IFormattable
    {
        if (!typeof(TEnum).IsEnum)
        {
            throw new ArgumentException("TEnum must be an Enumeration type");
        }

        return from e in Enum.GetValues(typeof(TEnum)).Cast<Enum>()
               select new KeyValuePair<string, string>(e.ToString(), e.Description());
    }

                  <ComboBox 
                      ItemsSource="{Binding DateModes}"
                      SelectedValue="{Binding SelectedDateDisplay}"
                      DisplayMemberPath="Value"
                      SelectedValuePath="Key"
                      VerticalAlignment="Top"/>