ASP.NET 最佳DataGrid读取单元格的值

采用asp:BoundColumn列

前台：

  <asp:BoundColumn DataField="UserID" HeaderText="工号">

后台:

foreach (DataGridItem item in dataGrid.Items)
{
    string userID = item.Cells[].Text;

}

这样的弊端就是如果列的索引发生变化，就导致读取不到对应的列所对应的单元格值。

最佳方法应该采用asp:TemplateColumn模板列的方式

参考：http://blog.csdn.net/aiouwen521/article/details/8490742

前台：

<asp:TemplateColumn>
   <ItemTemplate>
      <asp:TextBox Runat="server" ID="txtID" Text='<%# DataBinder.Eval(Container.DataItem,"au_id") %>'>
      </asp:TextBox>
   </ItemTemplate>
</asp:TemplateColumn> 

后台：

读取DataGrid控件TextBox值

foreach(DataGrid dgi in yourDataGrid.Items)
{
　TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");
　tb.Text....
}

针对TemplateColumn 优雅写法：

 List<RollLeaveDetailCom> rollLeaveDetailComList = new List<RollLeaveDetailCom>();
            foreach (DataGridItem item in this.gridDetails.Items)
            {
                RollLeaveDetailCom leaveDetailCom = new RollLeaveDetailCom();
                leaveDetailCom.StartDate = Convert.ToDateTime(item.ValueOf("txtStartDate"));
                leaveDetailCom.StartTime = item.ValueOf("txtStartTime");
                leaveDetailCom.EndDate = Convert.ToDateTime(item.ValueOf("txtEndDate"));
                leaveDetailCom.EndTime = item.ValueOf("txtEndTime");
                leaveDetailCom.TotalDay = item.ValueOf("txtTotalTime").Replace("天", "").ToInt();
                leaveDetailCom.SalaryDay = item.ValueOf("txtSalaryTime").Replace("天", "").ToInt();
                rollLeaveDetailComList.Add(leaveDetailCom);
            }
            return rollLeaveDetailComList;

       /// <summary>
       /// 扩展 DataGridItem, 取其内部控件的值
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="item"></param>
        /// <param name="ctrlId"></param>
        /// <returns></returns>
        public static string ValueOf(this DataGridItem item, string ctrlId)
        {
            if (item == null || string.IsNullOrEmpty(ctrlId)) return string.Empty;
            Control ctrl = item.FindControl(ctrlId);
            string result = string.Empty;
            if (ctrl is TextBox)
                result = (ctrl as TextBox).Text;
            else if (ctrl is HyperLink)
                result = (ctrl as HyperLink).Text;
            else if (ctrl is LinkButton)
                result = (ctrl as LinkButton).Text;
            else if (ctrl is HiddenField)
                result = (ctrl as HiddenField).Value;
            else if (ctrl is DropDownList)
                result = (ctrl as DropDownList).SelectedValue;
            return result;
        }

注意：BoundColumn列转换为TemplateColumn 可以通过DataGrid的属性编辑器可视化UI设计窗口进行转换。