94 lines
2.4 KiB
C#
94 lines
2.4 KiB
C#
using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Globalization;
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using System.Reflection;
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using System.Windows.Data;
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namespace ShrlAlgoToolkit.Mvvm.Converters;
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/// <summary>
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/// Description（描述特性）的枚举转换同时也是枚举源的集合
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/// </summary>
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public class EnumItemsSourceAndConverter : Collection<string>, IValueConverter
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{
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private IDictionary<object, object> displayNameToValueMap;
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private Type type;
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private IDictionary<object, object> valueToDisplayNameMap;
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public Type Type
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{
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get => type;
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set
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{
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if (!value.IsEnum)
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{
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throw new ArgumentException("不是枚举类型", $"{value}");
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}
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type = value;
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Initialize();
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}
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}
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/// <summary>
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/// 类属性到控件属性，源到目标
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/// </summary>
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/// <param name="value"></param>
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/// <param name="targetType"></param>
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/// <param name="parameter"></param>
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/// <param name="culture"></param>
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/// <returns></returns>
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public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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{
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//if (value != null)
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//{
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// int n = (int)value;
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// if (n == 0 || n == -1)
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// {
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// return null;
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// }
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//}
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return value == null
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? null
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: valueToDisplayNameMap.TryGetValue(value, out var value1)
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? value1
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: null;
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}
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/// <summary>
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/// 目标到源
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/// </summary>
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/// <param name="value"></param>
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/// <param name="targetType"></param>
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/// <param name="parameter"></param>
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/// <param name="culture"></param>
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/// <returns></returns>
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public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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{
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return value == null
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? null
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: displayNameToValueMap.TryGetValue(value, out var value1)
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? value1
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: null;
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}
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private static object GetDescription(FieldInfo fieldInfo)
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{
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var descriptionAttribute = (DescriptionAttribute)Attribute.GetCustomAttribute(fieldInfo, typeof(DescriptionAttribute));
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return descriptionAttribute != null ? descriptionAttribute.Description : fieldInfo.Name;
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}
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private void Initialize()
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{
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valueToDisplayNameMap = type.GetFields(BindingFlags.Static | BindingFlags.Public).ToDictionary(fi => fi.GetValue(null), GetDescription);
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displayNameToValueMap = valueToDisplayNameMap.ToDictionary(kvp => kvp.Value, kvp => kvp.Key);
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Clear();
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//当前converter的集合添加元素
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foreach (string name in displayNameToValueMap.Keys)
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{
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Add(name);
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}
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}
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}
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