public class CommonService    {        #region DataReader转化        /// <summary>        /// 将DataReader转化为Table        /// </summary>        /// <param name="reader"></param>        /// <returns></returns>        public static DataTable DataReaderToTable(SqlDataReader reader)        {            var dt = new DataTable();            if (reader.HasRows)            {                for (int i = 0; i < reader.FieldCount; i++)                {                    var column = new DataColumn();                    column.DataType = reader.GetFieldType(i);                    column.ColumnName = reader.GetName(i);                    dt.Columns.Add(column);                }                while (reader.Read())                {                    object[] rowObjects = new object[reader.FieldCount];                    for (int i = 0; i < reader.FieldCount; i++)                    {                        rowObjects.SetValue(reader.GetValue(i), i);                    }                    dt.LoadDataRow(rowObjects, true);                }            }            else            {                dt = null;            }            return dt;        }        /// <summary>        /// 将DataReader转化为Entity        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="reader"></param>        /// <returns></returns>        public static List<T> DataReaderToEntity<T>(SqlDataReader reader) where T : new()        {            var list = new List<T>();            T t = default(T);            if (reader.HasRows)            {                while (reader.Read())                {                    t = (T)Activator.CreateInstance(typeof(T));                    for (int i = 0; i < reader.FieldCount; i++)                    {                        PropertyInfo property = t.GetType().GetProperty(reader.GetName(i), BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);                        if (Convert.IsDBNull(reader.GetValue(i)))                        {                            property.SetValue(t, null, null);                        }                        else                        {                            property.SetValue(t, reader.GetValue(i), null);                        }                        list.Add(t);                    }                }            }            return list;        }        #endregion        #region DataTable转化        /// <summary>        /// Table转化为Entity        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="table"></param>        /// <returns></returns>        public static List<T> TableToEntity<T>(DataTable table) where T : new()        {            var list = new List<T>();            T t = default(T);            t = (T)Activator.CreateInstance(typeof(T));            if (table == null || table.Rows.Count == 0)            {            }            else            {                for (int i = 0; i < table.Rows.Count; i++)                {                    foreach (DataColumn column in table.Columns)                    {                        PropertyInfo propertyInfo = t.GetType().GetProperty(column.ColumnName, BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);                        if (Convert.IsDBNull(table.Rows[i][column.ColumnName]))                        {                            propertyInfo.SetValue(t, null, null);                        }                        else                        {                            propertyInfo.SetValue(t, table.Rows[i][column.ColumnName], null);                        }                    }                    list.Add(t);                }            }            return list;        }        /// <summary>        /// Table转化为DataSet        /// </summary>        /// <param name="table"></param>        /// <returns></returns>        public static DataSet TableToDataSet(DataTable table)        {            var dataSet = new DataSet();            dataSet.Tables.Add(table);            return dataSet;        }        #endregion        #region Entity转化为Table        public static DataTable EntityToTable<T>(List<T> list) where T : new()        {            var table = new DataTable();            if (list == null || list.Count == 0)            {            }            else            {                T t = list.FirstOrDefault();                List<PropertyInfo> propertyInfos = t.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase).ToList();                foreach (var propertyInfo in propertyInfos)                {                    table.Columns.Add(propertyInfo.Name, propertyInfo.PropertyType);                }                object[] objects = new object[propertyInfos.Count];                for (int i = 0; i < list.Count; i++)                {                    foreach (var propertyInfo in propertyInfos)                    {                        objects.SetValue(propertyInfo.GetValue(list[i], null), propertyInfos.IndexOf(propertyInfo));                    }                    table.LoadDataRow(objects, true);                }            }            return table;        }        #endregion    }