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);
}
}
}
}