/// <summary>

    /// List <-> DataSet

    /// </summary>

    public class IListDataSet

    {

        /// <summary>

        /// 集合装换DataSet

        /// </summary>

        /// <param name="list">集合</param>

        /// <returns></returns>

        public static DataSet ToDataSet(IList p_List)

        {

            DataSet result = new DataSet();

            DataTable _DataTable = new DataTable();

            if (p_List.Count > )

            {

                PropertyInfo[] propertys = p_List[].GetType().GetProperties();

                foreach (PropertyInfo pi in propertys)

                {

                    _DataTable.Columns.Add(pi.Name, pi.PropertyType);

                }

                for (int i = ; i < p_List.Count; i++)

                {

                    ArrayList tempList = new ArrayList();

                    foreach (PropertyInfo pi in propertys)

                    {

                        object obj = pi.GetValue(p_List[i], null);

                        tempList.Add(obj);

                    }

                    object[] array = tempList.ToArray();

                    _DataTable.LoadDataRow(array, true);

                }

            }

            result.Tables.Add(_DataTable);

            return result;

        }

        /// <summary>

        /// 泛型集合转换DataSet

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="list">泛型集合</param>

        /// <returns></returns>

        public static DataSet ToDataSet<T>(IList<T> list)

        {

            return ToDataSet<T>(list, null);

        }

        /// <summary>

        /// 泛型集合转换DataSet

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="p_List">泛型集合</param>

        /// <param name="p_PropertyName">待转换属性名数组</param>

        /// <returns></returns>

        public static DataSet ToDataSet<T>(IList<T> p_List, params string[] p_PropertyName)

        {

            List<string> propertyNameList = new List<string>();

            if (p_PropertyName != null)

                propertyNameList.AddRange(p_PropertyName);

            DataSet result = new DataSet();

            DataTable _DataTable = new DataTable();

            if (p_List.Count > )

            {

                PropertyInfo[] propertys = p_List[].GetType().GetProperties();

                foreach (PropertyInfo pi in propertys)

                {

                    if (propertyNameList.Count == )

                    {

                        // 没有指定属性的情况下全部属性都要转换

                        _DataTable.Columns.Add(pi.Name, pi.PropertyType);

                    }

                    else

                    {

                        if (propertyNameList.Contains(pi.Name))

                            _DataTable.Columns.Add(pi.Name, pi.PropertyType);

                    }

                }

                for (int i = ; i < p_List.Count; i++)

                {

                    ArrayList tempList = new ArrayList();

                    foreach (PropertyInfo pi in propertys)

                    {

                        if (propertyNameList.Count == )

                        {

                            object obj = pi.GetValue(p_List[i], null);

                            tempList.Add(obj);

                        }

                        else

                        {

                            if (propertyNameList.Contains(pi.Name))

                            {

                                object obj = pi.GetValue(p_List[i], null);

                                tempList.Add(obj);

                            }

                        }

                    }

                    object[] array = tempList.ToArray();

                    _DataTable.LoadDataRow(array, true);

                }

            }

            result.Tables.Add(_DataTable);

            return result;

        }

        /// <summary>

        /// DataSet装换为泛型集合

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="p_DataSet">DataSet</param>

        /// <param name="p_TableIndex">待转换数据表索引</param>

        /// <returns></returns>

        public static IList<T> DataSetToIList<T>(DataSet p_DataSet, int p_TableIndex)

        {

            if (p_DataSet == null || p_DataSet.Tables.Count < )

                return null;

            if (p_TableIndex > p_DataSet.Tables.Count - )

                return null;

            if (p_TableIndex < )

                p_TableIndex = ;

            DataTable p_Data = p_DataSet.Tables[p_TableIndex];

            // 返回值初始化

            IList<T> result = new List<T>();

            for (int j = ; j < p_Data.Rows.Count; j++)

            {

                T _t = (T)Activator.CreateInstance(typeof(T));

                PropertyInfo[] propertys = _t.GetType().GetProperties();

                foreach (PropertyInfo pi in propertys)

                {

                    for (int i = ; i < p_Data.Columns.Count; i++)

                    {

                        // 属性与字段名称一致的进行赋值

                        if (pi.Name.Equals(p_Data.Columns[i].ColumnName))

                        {

                            // 数据库NULL值单独处理

                            if (p_Data.Rows[j][i] != DBNull.Value)

                                pi.SetValue(_t, p_Data.Rows[j][i], null);

                            else

                                pi.SetValue(_t, null, null);

                            break;

                        }

                    }

                }

                result.Add(_t);

            }

            return result;

        }

        /// <summary>

        /// DataSet装换为泛型集合

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="p_DataSet">DataSet</param>

        /// <param name="p_TableName">待转换数据表名称</param>

        /// <returns></returns>

        public static IList<T> DataSetToIList<T>(DataSet p_DataSet, string p_TableName)

        {

            int _TableIndex = ;

            if (p_DataSet == null || p_DataSet.Tables.Count < )

                return null;

            if (string.IsNullOrEmpty(p_TableName))

                return null;

            for (int i = ; i < p_DataSet.Tables.Count; i++)

            {

                // 获取Table名称在Tables集合中的索引值

                if (p_DataSet.Tables[i].TableName.Equals(p_TableName))

                {

                    _TableIndex = i;

                    break;

                }

            }

            return DataSetToIList<T>(p_DataSet, _TableIndex);

        }

    }