gridview编辑之后更新不了

Question

public partial class 输入成绩 : System.Web.UI.Page
{
   
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            GridView1.DataBind();
        }    }
    //获取数据绑定在GV1上
    
    
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DataClassesDataContext ctx = new DataClassesDataContext();
        var products = from p in ctx.stu_
                       where p.ID == (int)GridView1.SelectedValue
                       select p;        GridView1.DataSource = products;
        GridView1.DataBind();    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataBind();    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        DataClassesDataContext db = new DataClassesDataContext();        var strid = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());
        stu_ ff = db.stu_.Single(b => b.ID == (strid));
        ff.name = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text;
        ff.number = ((TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text;
        ff.course = ((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text;
        ff.credit = ((TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).Text;
        ff. = ((TextBox)GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).Text;
        db.SubmitChanges();
        GridView1.EditIndex = -1;
        GridView1.DataBind();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Login.aspx");
        Response.End();
    }
}

Answer 1

  db.SubmitChanges();
  GridView1.EditIndex = -1;
  GridView1.DataBind();你都没重新取数据当然没更新的数据了，

Answer 2

 if (!Page.IsPostBack)
  {
   //我没见过有人这么写数据绑定，这里应该写一个完整的数据绑定方法而不是单独的 GridView1.DataBind();   GridView1.DataBind();改为databind()；  }
//比如下面是你绑定数据的完整方法
public void databind()
{
   DataClassesDataContext ctx = new DataClassesDataContext();
  var products = from p in ctx.stu_
  where p.ID == (int)GridView1.SelectedValue
  select p;  GridView1.DataSource = products;
  GridView1.DataBind();
}