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Building an embedded database engine in C#

, 10 Jun 2009 CPOL
DbfDotNet is a very fast and compact fully managed standalone database/entity framework, for the .Net Framework.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DbfDotNet.Linq
{
    using System.Linq;
    using System.Linq.Expressions;

    class DbfQuery<TRecord> : IQueryable<TRecord>
        where TRecord : DbfRecord, new()
    {
        Expression mExpression;
        DbfTable<TRecord> mTable;

        public DbfQuery(DbfTable<TRecord> table, Expression expression)
        {
            mTable = table;
            mExpression = expression;
        }


        #region IEnumerable<TRecord> Members

        IEnumerator<TRecord> IEnumerable<TRecord>.GetEnumerator()
        {
            return null;
            // this is where the fun starts
            //var mIndices = mTable.o.OpenIndexes;
            //if (mIndices.Length == 0)
            //{
            //    return mTable.GetEnumerator();
            //}
            //else
            //{
            //    DbfIndex<TRecord> index = mTable.OpenIndexes[0];
            //    return index.GetEnumerator();
            //}
        }

        #endregion

        #region IEnumerable Members

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            throw new NotImplementedException();
        }

        #endregion

        #region IQueryable Members

        Type IQueryable.ElementType
        {
            get { throw new NotImplementedException(); }
        }

        System.Linq.Expressions.Expression IQueryable.Expression
        {
            get { return mExpression; }
        }

        IQueryProvider IQueryable.Provider
        {
            get { return mTable; }
        }

        #endregion
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Pascal Ganaye
Software Developer (Senior)
United Kingdom United Kingdom
I am a French programmer.
These days I spend most of my time with the .NET framework, JavaScript and html.

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