ASP.NET网格视图:如何在编辑模式下控制列的格式?

给出以下内容 GridView 以下内容:

<asp:GridView runat="server" ID="GridMenuItemAttributes" DataKeyNames="MenuItemAttributeID" AutoGenerateColumns="false" 
        OnRowCommand="GridMenuItemAttributes_RowCommand" DataSourceID="DSMenuItemAttributes" OnRowEditing="GridMenuItemAttributes_RowEditing" >
<Columns>
    <asp:BoundField HeaderText="Description" DataField="DisplayName" />
    <asp:BoundField HeaderText="Price" DataField="Price" DataFormatString="{0:F2}" />
    <asp:CommandField ShowEditButton="true" ShowDeleteButton="true"
            EditText="Edit" DeleteText="Delete" />
</Columns>
</asp:GridView>

这个 Price 在查看行时,字段的格式正确,有两个小数位,但在编辑行时更改为四个小数位。我尝试了不同的格式(例如“c”,“0.00”),并附加了以下OnRowEditting处理程序:

protected void GridMenuItemAttributes_RowEditing( object sender, GridViewEditEventArgs e )
{
    int menuItemAttributeID = Convert.ToInt32( GridMenuItemAttributes.DataKeys[ e.NewEditIndex ].Value );

    if ( ! String.IsNullOrEmpty( GridMenuItemAttributes.Rows[ e.NewEditIndex ].Cells[ 1 ].Text ) )
    {
        String theValue = GridMenuItemAttributes.Rows[ e.NewEditIndex ].Cells[ 1 ].Text;
        GridMenuItemAttributes.Rows[ e.NewEditIndex ].Cells[ 1 ].Text = String.Format( "{0:0.00}", Convert.ToDouble( theValue ) );
    }
}

一切都无济于事。客户坚持,并且合理地说,在编辑单元格时,值应该以两个小数位显示。