GridView控件修改、删除、分页、排序示例（修改含有DropDownList控件）

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing" OnSorting="GridView1_Sorting" OnRowUpdating="GridView1_RowUpdating" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowDataBound="GridView1_RowDataBound" OnPageIndexChanging="GridView1_PageIndexChanging" CellPadding="4" AllowSorting="True" AllowPaging="True" PageSize="18">
              <Columns>
                  <asp:BoundField DataField="class_id" HeaderText="编号" ReadOnly="True" SortExpression="class_id">
                      <ItemStyle Width="60px" />
                  </asp:BoundField>
                  <asp:BoundField DataField="class_name" HeaderText="类别名称" SortExpression="class_name">
                      <ItemStyle Width="200px" />
                  </asp:BoundField>
                  
                  <asp:TemplateField HeaderText="父类别" SortExpression="class_parent">
                      <ItemTemplate>
                         <%#bindParent_Name(Eval("class_parent").ToString())%>
                      </ItemTemplate>
                      <EditItemTemplate>
                         <asp:HiddenField ID="HDFXueli" runat="server" Value='<%# Eval("class_parent") %>' />
                         <asp:DropDownList ID="DDLXueli" runat="server" Width="90px" />
                      </EditItemTemplate>
                      <ItemStyle Width="100px" />
                  </asp:TemplateField>
                            
                  <asp:CommandField EditText="修改" HeaderText="修改" ShowEditButton="True" >
                      <ItemStyle Width="60px" />
                  </asp:CommandField>
                  <asp:CommandField HeaderText="删除" ShowDeleteButton="True" >
                      <ItemStyle Width="60px" />
                  </asp:CommandField>
              </Columns>
              <PagerStyle HorizontalAlign="Center" Font-Bold="True" />
              <HeaderStyle HorizontalAlign="Left" />
              <SelectedRowStyle Font-Bold="True" />
              </asp:GridView>

  private void Bind()
    {
        string key = "";
        string parent_id = "";
        try
        {
            key = Request.QueryString["key"];
            parent_id = Request.QueryString["parent_id"];
        }
        catch
        {
            key = "";
            parent_id = "";
        }

        DataTable dt;
        if (parent_id != "" && parent_id != null)
        {
            Data d;
            string cond = "";
            if (key == "" || key == null)
            {
                if (parent_id == "0")
                    cond = "class_parent!=0";
                else
                    cond = "class_parent=" + parent_id;
            }
            else
            {
                if (parent_id == "0")
                    cond = "class_name like '%" + key + "%' and class_parent!=0";
                else
                    cond = "class_name like '%" + key + "%' and class_parent=" + parent_id;
            }
            d = new Data("bookClass", cond, "class_id desc", 1);
            dt = d.getDataTable();
        }
        else
        {
            dt = Dol.dtClassTwo();
        }

        string sort = (string)ViewState["SortOrder"] + " " + (string)ViewState["OrderDire"];
        bind.bindGridView(this.GridView1, dt, "class_id", sort);
    }

    //根据父目录编号返回名称
    public string bindParent_Name(string class_id)
    {
        string parent_name = class_id;
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            if (dt.Rows[i][0].ToString().Trim() == class_id.Trim())
            {
                parent_name = dt.Rows[i][1].ToString();
                break;
            }
        }
        return parent_name;
    }

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (((DropDownList)e.Row.FindControl("DDLXueli")) != null)
        {
            DropDownList ddlxueli = (DropDownList)e.Row.FindControl("DDLXueli");

            ddlxueli.DataSource = dt;
            ddlxueli.DataTextField = "class_name";
            ddlxueli.DataValueField = "class_id";
            ddlxueli.DataBind();

            //  选中 DropDownList
            ddlxueli.SelectedValue = ((HiddenField)e.Row.FindControl("HDFXueli")).Value;
        }

        //如果是绑定数据行 
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
            {
                ((LinkButton)e.Row.Cells[4].Controls[0]).Attributes.Add("onclick", "javascript:return confirm('你确认要删除：［" + e.Row.Cells[1].Text + "］吗？\\n删除类别［" + e.Row.Cells[1].Text + "］后该类别下的所有图书、子目录和子目录下的图书都将被删除！')");
            }
        }
    }

    //排序
    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {
        string sPage = e.SortExpression;
        if (ViewState["SortOrder"].ToString() == sPage)
        {
            if (ViewState["OrderDire"].ToString() == "Desc")
                ViewState["OrderDire"] = "ASC";
            else
                ViewState["OrderDire"] = "Desc";
        }
        else
        {
            ViewState["SortOrder"] = e.SortExpression;
        }
        Bind();
    }

    //编辑
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        Bind();
    }

    //删除
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string class_id = GridView1.DataKeys[e.RowIndex].Value.ToString();
        //删除该 目录下的图书
        DataDel d1 = new DataDel("book", "class_id=" + class_id);
        d1.ExceDel();

        //删除该目录下的子目录
        DataDel d3 = new DataDel("bookClass", "class_parent=" + class_id);
        d3.ExceDel();

        //删除该目录
        DataDel d = new DataDel("bookClass", "class_id=" + class_id);
        d.ExceDel();

        Bind();
    }

    //更新
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        string class_name = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim();
        string class_id = GridView1.DataKeys[e.RowIndex].Value.ToString();
        string class_parent = ((DropDownList)GridView1.Rows[e.RowIndex].FindControl("DDLXueli")).SelectedValue;

        Data d1 = new Data();
        if (d1.count("bookClass", "class_name='" + class_name + "' and class_parent=" + class_parent + " and class_id!=" + class_id) == 0)
        {
            DataUpdate d = new DataUpdate("bookClass", "class_name='" + class_name + "',class_parent=" + class_parent, "class_id=" + class_id);
            d.ExceUpdate();
            GridView1.EditIndex = -1;
            Bind();
        }
        else
        {
            Alert a = new Alert("［" + class_name + "］名称重复！");
            a.show();
        }
    }

    //取消
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        Bind();
    }

    //分页
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        Bind();
    }