MapInfo Update Feature

程序如下：

 1   private void updateFeatureToolStripMenuItem_Click(object sender, EventArgs e)
 2        {
 3            try
 4            {
 5                MapInfo.Data.Table CNTable = MapInfo.Engine.Session.Current.Catalog.GetTable("Testworld");
 6                MapInfo.Data.SearchInfo si = MapInfo.Data.SearchInfoFactory.SearchWhere("Country='China'");
 7                MapInfo.Data.IResultSetFeatureCollection irfc = MapInfo.Engine.Session.Current.Catalog.Search(CNTable, si);
 8                Feature ftr = irfc[0];
 9                ftr["Country"] = "China";
10               // CNTable.UpdateFeature(ftr);
11                MIConnection conn = new MIConnection();
12                conn.Open();
13                MICommand cmd = conn.CreateCommand();
14                cmd.CommandText = "update " + CNTable.Alias + " set obj=@obj,Country =@name where MI_Key =@MIKEY";
15                cmd.Parameters.Add("@obj", ftr.Geometry);
16                cmd.Parameters.Add("@name", "中国");
17                cmd.Parameters.Add("@MIKEY", ftr.Key);
18                cmd.ExecuteNonQuery();
19                
20                //change style
21                MapInfo.Styles.CompositeStyle cs = new MapInfo.Styles.CompositeStyle();
22                MapInfo.Styles.BitmapPointStyle bmpStyle = new MapInfo.Styles.BitmapPointStyle();
23                bmpStyle.Name = "YIEL2-32.BMP";
24                bmpStyle.PointSize =28;
25                cs.SymbolStyle = bmpStyle;            
26            
27            }
28            catch (Exception ex)
29            {
30                MessageBox.Show(ex.ToString());
31            }
32        }