using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Dynamic;

namespace DynamicClassDemo
{
    public static class Extensions
    {
        public static dynamic AsDynamic(this DataSet dataSet)
        {
            return new DataSetDynamicCaller(dataSet);
        }
    }

    public class DataSetDynamicCaller : DynamicObject
    {
        DataSet dataset;

        public DataSetDynamicCaller(DataSet dataset)
        {
            this.dataset = dataset;
        }

        public override object GetMember(System.Scripting.Actions.GetMemberAction info)
        {
            return new DataTableDynamicCaller(dataset.Tables[info.Name]);
        }
    }

    public class DataTableDynamicCaller : DynamicObject
    {
        DataTable dataTable;

        public DataTableDynamicCaller(DataTable dataTable)
        {
            this.dataTable = dataTable;
        }
        public override object InvokeMember(System.Scripting.Actions.CallAction info, object[] arguments)
        {
            if (info.Name == "GetRow")
            {
                return new DataRowDynamicCaller(dataTable.Rows[(int)arguments[0]]);
            }
            return base.InvokeMember(info, arguments);
        }
        
    }

    public class DataRowDynamicCaller : DynamicObject
    {
        DataRow dataRow;

        public DataRowDynamicCaller(DataRow dataRow)
        {
            this.dataRow = dataRow;
        }

        public override object GetMember(System.Scripting.Actions.GetMemberAction info)
        {
            return dataRow[info.Name];
        }
    }
}