>>755

[TypeConverter(typeof(Design.DataConverter))]
struct Data : IEquatable<Data> {
　public string Key { get; set; }
　public string Value { get; set; }

　public override int GetHashCode() {...}
　public override bool Equals(object obj) {...}
　public bool Equals(Data alt) { ... }
　...
}

namespace Design {
　class DataConverter : TypeConverter { ... }
}