namespace Yw.WinFrmUI
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{
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/// <summary>
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/// 枚举在propertyGrid中的显示
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/// </summary>
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public class EnumPropertyConverter : ExpandableObjectConverter
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{
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/// <summary>
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/// 构造函数
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/// </summary>
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public EnumPropertyConverter()
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{
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_dict = new Dictionary<object, string>();
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}
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private Dictionary<object, string> _dict;//枚举项集合
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/// <summary>
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/// 加载枚举项集合
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/// </summary>
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private void LoadDict(ITypeDescriptorContext context)
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{
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_dict = GetEnumValueDispDict(context.PropertyDescriptor.PropertyType);
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}
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/// <summary>
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/// 是否可从来源转换
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/// </summary>
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public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
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{
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if (sourceType == typeof(string))
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{
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return true;
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}
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return base.CanConvertFrom(context, sourceType);
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}
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/// <summary>
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/// 从来源转换
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/// </summary>
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public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
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{
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if (value is string)
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{
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//如果是枚举
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if (context.PropertyDescriptor.PropertyType.IsEnum)
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{
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if (_dict.Count <= 0)
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LoadDict(context);
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if (_dict.Values.Contains(value.ToString()))
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{
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foreach (object obj in _dict.Keys)
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{
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if (_dict[obj] == value.ToString())
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{
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return obj;
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}
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}
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}
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}
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}
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return base.ConvertFrom(context, culture, value);
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}
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/// <summary>
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/// 是否可转换
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/// </summary>
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public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
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{
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return true;
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}
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/// <summary>
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///
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/// </summary>
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public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
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{
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return true;
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}
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/// <summary>
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///
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/// </summary>
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public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
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{
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return true;
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}
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/// <summary>
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///
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/// </summary>
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public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
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{
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if (_dict == null || _dict.Count <= 0)
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LoadDict(context);
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StandardValuesCollection vals = new TypeConverter.StandardValuesCollection(_dict.Keys);
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return vals;
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}
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/// <summary>
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///
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/// </summary>
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public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
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{
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if (_dict.Count <= 0)
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LoadDict(context);
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foreach (object key in _dict.Keys)
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{
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if (key.ToString() == value.ToString() || _dict[key] == value.ToString())
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{
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return _dict[key].ToString();
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}
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}
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return base.ConvertTo(context, culture, value, destinationType);
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}
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/// <summary>
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/// 记载枚举的值+Display
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/// </summary>
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/// <param name="enumType"></param>
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/// <returns></returns>
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public Dictionary<object, string> GetEnumValueDispDict(Type enumType)
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{
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Dictionary<object, string> dict = new Dictionary<object, string>();
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FieldInfo[] fieldinfos = enumType.GetFields();
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foreach (FieldInfo field in fieldinfos)
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{
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if (field.FieldType.IsEnum)
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{
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Object[] objs = field.GetCustomAttributes(typeof(DisplayAttribute), false);
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if (objs.Length > 0)
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{
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dict.Add(Enum.Parse(enumType, field.Name), ((DisplayAttribute)objs[0]).Name);
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}
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}
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}
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return dict;
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}
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}
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}
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