早上看到有位同学问关于自动生成GridVie并且添加DataKeyNames属性后

回调页面时，出现错误异常.下面是我实现的方法。注意一点。就是数据绑定的时间。

要是先绑定，再添加到div1中，回调页面时，就会出错。

页面代码：

<div runat="server" id="div1" enableviewstate="false">
    </div>
    <asp:Button ID="Button1" runat="server" οnclick="Button1_Click" Text="Button" />

cs代码：

protected void Page_Load(object sender, EventArgs e)
    {
        bindGV();
    }
    private static DataTable NewMethod()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("id", typeof(int));
        dt.Columns.Add("name", typeof(string));
        for (int i = 0; i < 5; i++)
        {
            DataRow dr = dt.NewRow();
            dr["id"] = i;
            dr["name"] = "Name" + i;
            dt.Rows.Add(dr);
        }
        return dt;
    }
    private void bindGV()
    {
        div1.Controls.Clear();
        int t = 0;
        while (t < 3)
        {
            GridView gv = new GridView();
            gv = CreateSuperGrid();
            div1.Controls.Add(gv);
            t++;
        }
        for (int i = 0; i < div1.Controls.Count;i++ )
        {
            //我这里是先把GridView加入div1中，之后才进行数据绑定
            ((GridView)div1.Controls[i]).DataSource = NewMethod();
            ((GridView)div1.Controls[i]).DataBind();
        }

}

private GridView CreateSuperGrid()
    {
        GridView gv = new GridView();
        gv.AutoGenerateColumns = false;
        gv.EnableViewState = true;
        gv.DataKeyNames = new string[] { "id" };

BoundField bf = new BoundField();
        bf = new BoundField();
        bf.HeaderText = "序号";
        bf.DataField = "id";
        gv.Columns.Add(bf);

BoundField bf2 = new BoundField();
        bf2.HeaderText = "名称";
        bf2.DataField = "name";
        gv.Columns.Add(bf2);

CommandField cf = new CommandField();
        cf.ShowSelectButton = true;
        gv.Columns.Add(cf);

gv.SelectedIndexChanging += new GridViewSelectEventHandler(GridView1_SelectedIndexChanged);

return gv;
    }

//用做回调页面用的
    protected void Button1_Click(object sender, EventArgs e)
    {

}
    protected void GridView1_SelectedIndexChanged(object sender, GridViewSelectEventArgs e)
    {
        string value = ((System.Web.UI.WebControls.GridView)(sender)).DataKeys[e.NewSelectedIndex].Value.ToString();//这里可以看到取到的id值
    }