MapXtreme2004代码 搜索特定图元并将其显示到地图上

private void showMap()

{

MIDataReader tr;

MIConnection con=new MIConnection();

MICommand tc=con.CreateCommand();

tc.CommandText="select 村 from 农安 where PH__2002 > 8.5";

//sql语句

con.Open();

IFeatureCollection fc = tc.ExecuteFeatureCollection();

//得到Features集合

tr=tc.ExecuteReader();

while (tr.Read())

{

Response.Write(tr.GetString(0)+" ");

//显示搜索到的信息

}

tc.Cancel();

tc.Dispose();

tr.Close();

con.Close();

IResultSetFeatureCollection ff = (IResultSetFeatureCollection)fc;

//强行转化为IResultSetFeatureCollection

if (MapInfo.Engine.Session.Current.Selections.DefaultSelection.Style.AreaStyle.Interior is SimpleInterior)

{

((SimpleInterior)MapInfo.Engine.Session.Current.Selections.DefaultSelection.Style.AreaStyle.Interior).BackColor = Color.Red;

//更改DefaultSelection的背景颜色

}

MapInfo.Engine.Session.Current.Selections.DefaultSelection.Clear();

MapInfo.Engine.Session.Current.Selections.DefaultSelection.Add(ff);

//添加到DefaultSelection中 用户可见到效果

}