Mapxtreme 2005 添加点？

[buptxf]

我在网上找到了一些在地图上添加点的代码。把他们放在单线程程序下运行正常，能看见添加的点。可是如果另起一个线程就看不见新加的点，不知道为啥？下面是添加点的程序：
public void CreateTempLayer()
{
MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[MainMap.MapAlias];

//指定表名建立表信息
MapInfo.Data.TableInfoMemTable tblInfoTemp = new MapInfo.Data.TableInfoMemTable(tempLayerTableName);

//确保当前目录下不存在同名表
MapInfo.Data.Table tblTemp = MapInfo.Engine.Session.Current.Catalog.GetTable(tempLayerTableName);
if (tblTemp != null)
{
MapInfo.Engine.Session.Current.Catalog.CloseTable(tempLayerTableName);
}

//向表信息中添加可绘图列
tblInfoTemp.Columns.Add(MapInfo.Data.ColumnFactory.CreateFeatureGeometryColumn(myMap.GetDisplayCoordSys()));
tblInfoTemp.Columns.Add(MapInfo.Data.ColumnFactory.CreateStyleColumn());

//向表信息中添加自定义列
tblInfoTemp.Columns.Add(MapInfo.Data.ColumnFactory.CreateIntColumn("index"));
tblInfoTemp.Columns.Add(MapInfo.Data.ColumnFactory.CreateStringColumn("name", 10));

//根据表信息创建临时表
tblTemp = MapInfo.Engine.Session.Current.Catalog.CreateTable(tblInfoTemp);

//指定表，图层名和图层别名创建临时图层
FeatureLayer tempLayer = new FeatureLayer(tblTemp, tempLayerName, tempLayerName);
myMap.Layers.Add(tempLayer);
}



public void AddPointToLayer()
{
CreateTempLayer();
//dPoint.x = 116.346864;
//dPoint.y = 39.940982;

dPoint.x = 116.210368;
dPoint.y = 39.576692;

//dPoint.x = 234.09959;
//dPoint.y = 23.976621;

MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[MainMap.MapAlias];

//获取图层和表
FeatureLayer workLayer = (MapInfo.Mapping.FeatureLayer)myMap.Layers[tempLayerName];
MapInfo.Data.Table tblTemp = MapInfo.Engine.Session.Current.Catalog.GetTable(tempLayerTableName);

//创建点图元及其样式
FeatureGeometry pgPoint = new MapInfo.Geometry.Point(workLayer.CoordSys, dPoint);
MapInfo.Styles.SimpleVectorPointStyle spsPoint = new MapInfo.Styles.SimpleVectorPointStyle(37, System.Drawing.Color.Green, 20);
MapInfo.Styles.CompositeStyle csPoint = new MapInfo.Styles.CompositeStyle(spsPoint);
MapInfo.Data.Feature ptPoint = new MapInfo.Data.Feature(tblTemp.TableInfo.Columns);
ptPoint.Geometry = pgPoint;
ptPoint.Style = csPoint;

//将点图元加入图层
workLayer.Table.InsertFeature(ptPoint);


}

我如果这样调用：
AddPoint add = new AddPoint(MainMap);
add.AddPointToLayer();
就没有问题
但如果这样，就看不见新加的点
AddPoint add = new AddPoint(MainMap);
Thread t = new Thread(add.AddPointToLayer);
t.Start();

[buptxf]

问题已经解决
MapInfo.Engine.Session.Dispose();

[gaochunchao]

MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[MainMap.MapAlias];
我想请教一下，上面那就代码中MainMap是MapControl控件属性么，在form窗体设计中能用么?为什么我找不到这个属性呢？

[td8777]

MainMap是指你当前用的mapControl，写成这样可能更好理解：

MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[mapControl1.Map.Alias];