kev/Drawer/UCDraw/SigmaDrawerStyle/Converter/YesNoConverter.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GeoSigma.SigmaDrawerStyle.Converter
{
    public class YesNoConverter : BaseDropDownConverter
    {
        private static readonly string Yes = "是";
        private static readonly string No = "否";

        private static volatile StandardValuesCollection values = new StandardValuesCollection(new object[2]
        {
            true, false
        });

        public override TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
        {
            return values;
        }

        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == typeof(string))
            {
                return true;
            }
            return base.CanConvertFrom(context, sourceType);
        }

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            if (value is string)
            {
                if (value.Equals(YesNoConverter.Yes))
                    return true;

                if (value.Equals(YesNoConverter.No))
                    return false;
            }
            return base.ConvertFrom(context, culture, value);
        }

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                return true;
            }
            return base.CanConvertTo(context, destinationType);
        }

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                if (value is bool bValue)
                    return bValue ? YesNoConverter.Yes : YesNoConverter.No;
            }

            return base.ConvertTo(context, culture, value, destinationType);
        }
    }
}