List转DataTable

一、简单讲解

结合图片简单讲解DataTable几个比较重要的属性以便于更好的理解代码。

     

Table:表示一个表;
Rows:表行的集合;
Columns:表列的集合;

单元格是表格中行与列的交叉部分;

Rows[index]:index代表下标,从0开始;可以定位到第几行。

比如

Rows[0],代表第一行;

Rows[1],代表第二行;

Columns[index]:index代表下标,从0开始;可以定位到第几列。

Columns[0],代表第一列;

Columns[1],代表第二列;

 

想要获取到第几行第几列的数据我们有两种方法:

1) rows[行数][列数];

2) rows[行数][列名];

 

按照上图一的标记

想要获取标记为①的单元格值103

var value = rows[3][3]; 第4行第4列单元格值:

var value= rows[3]["MemberId"];第4行列名为MemberId的单元格值:

 

想要获取标记为②的单元格值CS202206271430001:

var value = rows[1][7]; 第2行第8列单元格值:

var value= rows[1]["UsageBillNo"];第2行列名为UsageBillNo的单元格值: 

二、List转DataTable 代码如下 

        /// <summary>
        /// 测试入口
        /// 模拟数据
        /// </summary>
        /// <returns></returns>
        public DataTable ListToDataTableTest() {

             var couponUsageList = new List<CrmCouponTestDto>() {
                 new CrmCouponTestDto {
                     Id=1,
                     CouponCode="test001",
                     CouponId = 1,
                     MemberId=100,
                     IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
                     UsageTime=Convert.ToDateTime("3000-12-31 00:00:00"),
                     UsageShopId=0,
                     UsageBillNo="",
                     EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
                     EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
                     Status=0
                 },
                 new CrmCouponTestDto {
                     Id=2,
                     CouponCode="test002",
                     CouponId = 1,
                       MemberId=101,
                     IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
                     UsageTime=Convert.ToDateTime("2022-06-27 14:30:00"),
                     UsageShopId=2,
                     UsageBillNo="CS202206271430001",
                     EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
                     EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
                     Status=1
                 },
                  new CrmCouponTestDto {
                     Id=3,
                     CouponCode="test003",
                     CouponId = 1,
                     MemberId=102,
                     IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
                     UsageTime=Convert.ToDateTime("3000-12-31 00:00:00"),
                     UsageShopId=0,
                     UsageBillNo="",
                     EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
                     EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
                     Status=0
                 },
                    new CrmCouponTestDto {
                     Id=4,
                     CouponCode="test004",
                     CouponId = 1,
                     MemberId=103,
                     IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
                     UsageTime=Convert.ToDateTime("3000-12-31 00:00:00"),
                     UsageShopId=0,
                     UsageBillNo="",
                     EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
                     EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
                     Status=0
                 }
             };
             return ListToDataTable<CrmCouponTestDto>(couponUsageList);

        }

        /// <summary>
        /// 将List转化为DataTable核心方法
        /// </summary>
        /// <returns></returns>
        public DataTable ListToDataTable<T>(List<T> data)
        {
            #region 创建一个DataTable,以实体名称作为DataTable名称

            var tableName = typeof(T).Name;
            DataTable dt = new DataTable
            {
                TableName = tableName
            };

            #endregion

            #region 拿取列名,以实体的属性名作为列名       
                               
            var properties = typeof(T).GetProperties();
            foreach (var item in properties)
            {
                var curFileName = item.Name;
                dt.Columns.Add(curFileName);
            }

            #endregion

            #region 列赋值
            foreach (var item in data)
            {
                DataRow dr = dt.NewRow();
                var columns = dt.Columns;

                var curPropertyList=item.GetType().GetProperties();
                foreach (var p in curPropertyList)
                {  
                    var name = p.Name;                                
                    var curValue = p.GetValue(item);
                 
                    int i = columns.IndexOf(name);
                    dr[i] = curValue;
                }

                dt.Rows.Add(dr);
            }

            #endregion  

            return dt;
        }


  /// <summary>
    /// 实体
    /// </summary>
    public  class CrmCouponTestDto
    {
        /// <summary>
        /// ID
        /// </summary>
        public long  Id { get; set; }

        /// <summary>
        /// 卡券号
        /// </summary>     
        public string CouponCode { get; set; }

        /// <summary>
        /// 卡券ID
        /// </summary>
        public int CouponId { get; set; }

        /// <summary>
        /// 会员ID
        /// </summary>
        public int MemberId { get; set; }

        /// <summary>
        /// 发放时间
        /// </summary>   
        public DateTime IssueTime { get; set; }

        /// <summary>
        /// 使用时间
        /// </summary>      
        public DateTime UsageTime { get; set; }

        /// <summary>
        /// 使用店铺ID
        /// </summary>      

        public int UsageShopId { get; set; }

        /// <summary>
        /// 使用单号
        /// </summary>      
        public string UsageBillNo { get; set; }

        /// <summary>
        /// 有效开始时间
        /// </summary>      
        public DateTime EffectiveStart { get; set; }

        /// <summary>
        /// 有效结束时间
        /// </summary>      
        public DateTime EffectiveEnd { get; set; }

        /// <summary>
        /// 状态
        /// CouponStatus 卡券状态:
        /// -1:未领用
        /// 0:未使用
        /// 1:已使用
        /// 2:已过期
        ///3:已作废
        ///4:转赠中
        /// </summary>
    
        public Int16 Status { get; set; }
    }
View Code

  

posted @ 2022-06-27 13:43  姚小丹  阅读(1361)  评论(0编辑  收藏  举报