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：