DataSetToList 和 DataTableTolist 转换

DataSetToList 及DataTableTolist经常使用，在此分享一下我的方法。

 

1、DataSetToList

        /// <summary>        
        /// DataSetToList        
        /// </summary>         
        /// <typeparam name="T">转换类型</typeparam>        
        /// <param name="dataSet">数据源</param>        
        /// <param name="tableIndex">需要转换表的索引</param>       
        /// /// <returns>泛型集合</returns>
        public static List<T> DataSetToList<T>(DataSet dataset, int tableIndex)
        {
            //确认参数有效
            if (dataset == null || dataset.Tables.Count <= 0 || tableIndex < 0)
            {
                return null;
            }

            DataTable dt = dataset.Tables[tableIndex];

            List<T> list = new List<T>();


            for (int i = 0; i < dt.Rows.Count; i++)
            {
                //创建泛型对象
                T _t = Activator.CreateInstance<T>();

                //获取对象所有属性
                PropertyInfo[] propertyInfo = _t.GetType().GetProperties();

                //属性和名称相同时则赋值
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    foreach (PropertyInfo info in propertyInfo)
                    {
                        if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))
                        {
                            if (dt.Rows[i][j] != DBNull.Value)
                            {
                                info.SetValue(_t, dt.Rows[i][j], null);
                            }
                            else
                            {
                                info.SetValue(_t, null, null);
                            }

                            break;
                        }
                    }
                }

                list.Add(_t);
            }

            return list;
        }

2、DataTableToList

        /// <summary>
        /// 将DataTalbe 转为List
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="table"></param>
        /// <returns></returns>
        public static List<T> ConvertToList<T>(DataTable table) where T : new()
        {

            List<T> list = null;
            if (table != null)
            {
                DataColumnCollection columns = table.Columns;
                int columnCount = columns.Count;
                T type = new T();
                Type columnType = type.GetType();
                PropertyInfo[] properties = columnType.GetProperties();
                if (properties.Length == columnCount)
                {

                    list = new List<T>();
                    foreach (DataRow currentRow in table.Rows)
                    {
                        for (int i = 0; i < columnCount; i++)
                        {
                            for (int j = 0; j < properties.Length; j++)
                            {
                                if (columns[i].ColumnName == properties[j].Name)
                                {
                                    if (currentRow[i] != DBNull.Value)
                                    {
                                        properties[j].SetValue(type, currentRow[i], null);
                                    }
                                }
                            }
                        }

                        list.Add(type); type = new T();
                    }
                }

                else { list = null; }
            }

            else
            {
                throw new ArgumentNullException("参数不能为空");
            }

            return list;
        } 

    }