Customize Applications with XML Fragments: Part 2

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using Bulasoft.Common.Elements;

namespace Bulasoft.Common.Elements
{
    public class StringDictionaryConvertor : TypeConverter
    {
        protected class StringDictionaryPropertyDescriptor : TypeConverter.SimplePropertyDescriptor
        {
            private string _key;
            private Element owner;
            public StringDictionaryPropertyDescriptor(Type componentType, string name, Type propertyType, string key, Element owner)
                :
                base(componentType, name, propertyType)
            {
                this.owner = owner;
                _key = key;
            }

            public override object GetValue(object component)
            {
                StringDictionary dict = (StringDictionary)component;
                if (dict.ContainsKey(_key))
                    return (component as StringDictionary)[_key];
                else
                    return null;
            }

            public override void SetValue(object component, object value)
            {
                (component as StringDictionary)[_key] = (string)value;
            }
        }


        public override bool GetPropertiesSupported(ITypeDescriptorContext context)
        {
            return context != null;
        }

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