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[ASP.net教程]在Gridview如何进行每行单元格比较


有在论坛上看到一个问题,就是在Gridview控件中,需要对几个列的数值进行比较,原问题如下:

 

先在数据库中准备数据:

 

CREATE TABLE [dbo].[RecordTime](  Id INT IDENTITY(1,1) PRIMARY KEY,  Time1 DATETIME,  Time2 DATETIME,  Time3 DATETIME,  Time4 DATETIME)GOINSERT INTO [dbo].[RecordTime] VALUES ('2015-05-11 09:48','2015-05-20 10:08','2015-05-13 14:48','2015-05-19 08:48'),                   ('2015-05-10 14:48','2015-05-01 10:02','2015-05-20 12:48','2015-05-20 10:20'),                   ('2015-05-20 10:31','2015-05-03 10:40','2015-05-14 10:40','2015-05-25 09:48') GO CREATE PROCEDURE [dbo].[usp_RecordTime_GetAll] AS  SELECT [Id],[Time1],[Time2],[Time3],[Time4] FROM [dbo].[RecordTime]GO

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在aspx网页上写好GridView控件:

 

然后可以在.aspx.cs代码页中实现OnRowDataBound="GridView1_RowDataBound"事件:


.aspx.cs代码:

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using Insus.NET;using System.Data;using System.Drawing;public partial class _Default : System.Web.UI.Page{  RecordTime rt = new RecordTime();  protected void Page_Load(object sender, EventArgs e)  {    if (!IsPostBack)      Data_Binding();  }  private void Data_Binding()  {    this.GridView1.DataSource = rt.GetRecordTime();    this.GridView1.DataBind();  }  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)  {    if (e.Row.RowType != DataControlRowType.DataRow) return;    DataRowView drv = (DataRowView)e.Row.DataItem;    List<DateTime> lDT = new List<DateTime>();    lDT.Add(Convert.ToDateTime(drv["Time1"]));    lDT.Add(Convert.ToDateTime(drv["Time2"]));    lDT.Add(Convert.ToDateTime(drv["Time3"]));    lDT.Add(Convert.ToDateTime(drv["Time4"]));    DateTime dt = lDT.Max<DateTime>();    int i = lDT.IndexOf(dt);    int actualIdx = i + 1;    e.Row.Cells[actualIdx].ForeColor = Color.FromName("red");  }}

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运行得到的效果: