PrncplDescriptionProvider.cs

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using System;
using System.ComponentModel;

namespace AcUtils
{
    [Serializable]
    class PrncplDescriptionProvider : TypeDescriptionProvider
    {
        private ICustomTypeDescriptor td;

        public PrncplDescriptionProvider()
           : this(TypeDescriptor.GetProvider(typeof(AcUser)))
        {
        }

        public PrncplDescriptionProvider(TypeDescriptionProvider parent)
            : base(parent)
        {
        }

        public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
        {
            if (td == null)
            {
                td = base.GetTypeDescriptor(objectType, instance);
                td = new PrncplTypeDescriptor(td);
            }

            return td;
        }
    }
}