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Dapper Extensions 라이브러리를 사용하려면
4

 /// <summary>
        ///       
        /// </summary>
        public void InsertBatch<T>(IDbConnection conn, IEnumerable<T> entityList, IDbTransaction transaction = null) where T : class
        {
            var tblName = string.Format("dbo.{0}", typeof(T).Name);
            var tran = (SqlTransaction)transaction;
            using (var bulkCopy = new SqlBulkCopy(conn as SqlConnection, SqlBulkCopyOptions.TableLock, tran))
            {
                bulkCopy.BatchSize = entityList.Count();
                bulkCopy.DestinationTableName = tblName;
                var table = new DataTable();
                DapperExtensions.Sql.ISqlGenerator sqlGenerator = new SqlGeneratorImpl(new DapperExtensionsConfiguration());
                var classMap = sqlGenerator.Configuration.GetMap<T>();
                var props = classMap.Properties.Where(x => x.Ignored == false).ToArray();
                foreach (var propertyInfo in props)
                {
                    bulkCopy.ColumnMappings.Add(propertyInfo.Name, propertyInfo.Name);
                    table.Columns.Add(propertyInfo.Name, Nullable.GetUnderlyingType(propertyInfo.PropertyInfo.PropertyType) ?? propertyInfo.PropertyInfo.PropertyType);
                }
                var values = new object[props.Count()];
                foreach (var itemm in entityList)
                {
                    for (var i = 0; i < values.Length; i++)
                    {
                        values[i] = props[i].PropertyInfo.GetValue(itemm, null);
                    }
                    table.Rows.Add(values);
                }
                bulkCopy.WriteToServer(table);
            }
        }

추가 참조:http://www.lanhusoft.com/Article/26.html
Dapper Extensions 주소:https://github.com/tmsmith/Dapper-Extensions