Gridview单元格编辑使用中注意问题

1.数据库中务必设置主键，才可以使用SqlDataSource的高级配置，必须注意在相连的gridview中加

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" OnRowDataBound="GridView1_RowDataBound" OnRowCommand="GridView1_RowCommand" OnRowUpdating="GridView1_RowUpdating"  DataKeyNames="numID">  

为了找出DataKeyNames="numID”这个错误，花费了整整2个小时。终于找到数据修改后为什么没有更新

2.SqlDataSource设置

    

        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:jingluoConnectionString %>"

            SelectCommand="SELECT [numID], [symptom], [userName], [bodypart] FROM [Symptom] WHERE (([userName] = @userName) AND ([bodypart] = @bodypart))" 

            DeleteCommand="DELETE FROM [Symptom] WHERE [numID] = @numID" InsertCommand="INSERT INTO [Symptom] ([symptom], [userName], [bodypart]) VALUES (@symptom, @userName, @bodypart)" 

            UpdateCommand="UPDATE [Symptom] SET [symptom] = @symptom WHERE [numID] = @numID" >

            <SelectParameters>

                <asp:SessionParameter DefaultValue="小明" Name="userName" SessionField="username"   Type="String" />

                <asp:ControlParameter ControlID="TextBox1" DefaultValue="头部" Name="bodypart" PropertyName="Text"  Type="String" />

            </SelectParameters>

            <UpdateParameters>

                <asp:Parameter Name="symptom" Type="String" />

                <asp:Parameter Name="userName" Type="String" />

                <asp:Parameter Name="bodypart" Type="String" />

                <asp:Parameter Name="numID" Type="Int32" />

            </UpdateParameters>

            <DeleteParameters>

                <asp:Parameter Name="numID" Type="Int32" />

            </DeleteParameters>

            <InsertParameters>

                <asp:Parameter Name="symptom" Type="String" />

                <asp:Parameter Name="userName" Type="String" />

                <asp:Parameter Name="bodypart" Type="String" />

            </InsertParameters>

        </asp:SqlDataSource>

3.有关在后台修改中的代码

 protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)

    {



        GridView _gridView = (GridView)sender;

        string key = "";

        string value = "";



        // NewValues集合里的key

        string[] _columnKeys = new string[] { "LastName", "FirstName", "Country" };



        if (e.RowIndex > -1)

        {

            // 循环每一列

            //for (int i = _firstEditCellIndex; i < _gridView.Columns.Count; i++)

            {

                // 获得单元格里的控件

                Control _displayControl = _gridView.Rows[e.RowIndex].Cells[2].Controls[1];

                Control _editControl = _gridView.Rows[e.RowIndex].Cells[2].Controls[3];



                // 获得列的key

                key = _columnKeys[2 - _firstEditCellIndex];



                // 如果单元格处于编辑模式的话，那么从编辑控件中获取值

                if (_editControl.Visible)

                {

                    if (_editControl is TextBox)

                    {

                        value = ((TextBox)_editControl).Text;

                    }

                    else if (_editControl is DropDownList)

                    {

                        value = ((DropDownList)_editControl).SelectedValue;

                    }



                    // 增加key/value对到NewValues集合

                    e.NewValues.Add(key, value);

                }

                // 否则从显示控件中获取值

                else

                {

                    value = ((Label)_displayControl).Text.ToString();



                    // 增加key/value对到NewValues集合

                    e.NewValues.Add(key, value);

                }

            }

        }

    }