效果如图：
首先允许排序：AllowSorting="True"；开启gridview的排序事件onsorting="GridView1_Sorting"，也可以双击sorting事件；其次是设置nrowdatabound="GridView1_RowDataBound"，也可以双击GridView1_RowDataBound
关联排序表达式SortExpression="字段名称"
代码明细：
前台代码：
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
CellPadding="4" ForeColor="#333333" Width="800px"
AllowSorting="True"
onrowdatabound="GridView1_RowDataBound" onsorting="GridView1_Sorting"
PageSize="15">
<PagerSettings Mode="NumericFirstLast"/>
<RowStyle BackColor="#EFF3FB"/>
<Columns>
<asp:BoundField DataField="CourseResID" HeaderText="课程ID"/>
<asp:BoundField DataField="CourseName" HeaderText="课程名" SortExpression="CourseName">
<ItemStyle Width="100px"/>
</asp:BoundField>
<asp:BoundField DataField="upTime" HeaderText="更新时间"
DataFormatString="{0:yyyy-MM-dd}" SortExpression="upTime">
<ItemStyle Width="160px" HorizontalAlign="Right"/>
</asp:BoundField>
<asp:BoundField DataField="UserName" HeaderText="用户名" SortExpression="UserName">
<ItemStyle Width="80px" ForeColor="#33CC33"/>
</asp:BoundField>
</Columns>
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White"/>
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Right"/>
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333"/>
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White"/>
<EditRowStyle BackColor="#2461BF"/>
<AlternatingRowStyle BackColor="White"/>
</asp:GridView>
</div>
</form>
</body>
</html>
数据读取
/// 获取绑定数据
///</summary>
///<param name="orderFields">排序信息</param>
///<returns>返回表</returns>
public DataTable GetContents(string orderFields)
{
string cmdTxt ="Select top 30 * From CourseRes";
//判断排序字段是否为空，如果不为空则将排序信息加在Sql语句后面
if (!string.IsNullOrEmpty(orderFields))
{
cmdTxt +=" Order By "+ orderFields;
}
SqlConnection conn =new SqlConnection(@"Data Source=HAPPY-WITBANK;Initial Catalog=le2011;Persist Security Info=True;User ID=sa;Password=happy");
SqlCommand comm =new SqlCommand(cmdTxt, conn);
SqlDataAdapter adap =new SqlDataAdapter(comm);
DataTable dt =new DataTable();
adap.Fill(dt);
return dt;
}
排序信息代码，可以通用;注，要用时只需将上面的绑定Sql数据修改即可
{
protectedvoid Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
DataLoad();
}
}
///<summary>
/// 数据加载
///</summary>
privatevoid DataLoad()
{
string sortedField ="";
//获取排序字段的信息
if (ViewState["SortedField"] !=null)
{
//如果存在排序信息，则将排序信息转换为字典存储
Dictionary<string, string> sorted = (Dictionary<string, string>)ViewState["SortedField"];
//便利取值
foreach (KeyValuePair<string, string> kvp in sorted)
{
//key排序字段，value排序信息
sortedField = kvp.Key +""+ kvp.Value;
}
}
//数据绑定
this.GridView1.DataSource = GetContents(sortedField);
this.GridView1.DataBind();
}
protectedvoid GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
#region//加排序的头方法
//判断是否是表头
if (e.Row.RowType == DataControlRowType.Header)
{
//判断是否进行排序
if (ViewState["SortedField"] !=null)
{
//恢复排序信息
Dictionary<string, string> order = (Dictionary<string, string>)ViewState["SortedField"];
//循环表头的单元格，判断是否有需要排序的单元格
for (int i =0; i < e.Row.Cells.Count; i++)
{
if (e.Row.Cells[i].Controls.Count >0)
{
//是否是排序字段信息
LinkButton lb = e.Row.Cells[i].Controls[0] as LinkButton;
if (lb !=null)
{
//反序和降序
if (order.ContainsKey(lb.CommandArgument))
{
Literal li =new Literal();
if (order[lb.CommandArgument] =="ASC")
{
li.Text ="▲";
}
else
{
li.Text ="▼";
}
//
e.Row.Cells[i].Controls.Add(li);
}
}
}
}
}
}
#endregion 完成排序
}
protectedvoid GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
//
Dictionary<string, string> sorted =new Dictionary<string, string>();
//从ViewState读取上一次的排序信息。
if (ViewState["SortedField"] ==null)
{
//如果没有排序信息，则将当前点击的对象（即点击的排序字段）和排序信息添加到字典中
sorted.Add(e.SortExpression, "ASC");
//将排序信息放在字典中保存
ViewState["SortedField"] = sorted;
}
else
{
//判断是否点击相同的排序，如果是相同的排序，
//就是用反序
//如果不是想通的排序，那就新的派讯，是用升序
sorted = (Dictionary<string, string>)ViewState["SortedField"];
if (sorted.ContainsKey(e.SortExpression))
{
if (sorted[e.SortExpression] =="ASC")
{
sorted[e.SortExpression] ="DESC";
}
else
{
sorted[e.SortExpression] ="ASC";
}
}
else
{
sorted.Clear();
sorted.Add(e.SortExpression, "ASC");
ViewState["SortedField"] = sorted;
}
}
//重新加载数据
DataLoad();
}
}