comboitemconverter.cs

ASP中web自定义控件的使用源码及说明文档

using System;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Reflection;

namespace Bestcomy.Web.UI.WebControls
{
	/// <summary>
	///
	/// </summary>
	public class ComboItemConverter : ExpandableObjectConverter
	{
		public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
		{
			if(destinationType == typeof(InstanceDescriptor))
			{
				return true;
			}
			return base.CanConvertTo (context, destinationType);
		}

		public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
		{
			if (destinationType == typeof(InstanceDescriptor) && value is ComboItem)
			{
				ComboItem item = (ComboItem)value;
              
				ConstructorInfo ci = typeof(ComboItem).
					GetConstructor(new Type[] {});
				if (ci != null)
				{
					return new InstanceDescriptor(ci, null, false);
				}
			}
			return base.ConvertTo (context, culture, value, destinationType);
		}


	}
}