用mapxtreme开发小结1（c#）

创建新表 Temp

    MapInfo.Data.Table tblTemp=Session.Current.Catalog.GetTable("Temp");
    if (tblTemp!=null) tblTemp.Close();
    mapControl1.Map.Clear();

    // create a temporary table and add a featurelayer for it
    FeatureLayer layerTemp=new FeatureLayer(Session.Current.Catalog.CreateTable(    TableInfoFactory.CreateTemp("Temp"), new TableSessionInfo()));
    mapControl1.Map.Layers.Add(layerTemp);

图层筛选器

1 ToolFilter toolFilter = (ToolFilter) mapControl1.Tools.AddMapToolProperties.InsertionLayerFilter ;
2 if (toolFilter != null && !toolFilter.IncludeLayer(layerTemp) )
3 toolFilter.SetExplicitInclude(layerTemp, true);
4 toolFilter=(ToolFilter) mapControl1.Tools.SelectMapToolProperties.EditableLayerFilter;
5 if (toolFilter != null && !toolFilter.IncludeLayer(layerTemp) )
6 toolFilter.SetExplicitInclude(layerTemp, true);

设置地图中心点

1 mapControl1.Map.SetView(new DPoint(-100,30),
2 Session.Current.CoordSysFactory.CreateLongLat(DatumID.WGS84),60000000);

一些winform的知识：

string strPath=Application.StartupPath;

strPath=strPath.Substring(0,strPath.LastIndexOf(Path.DirectorySeparatorChar)+1) // get rid of \bin

注册表操作：

Microsoft.Win32.RegistryKey keySamp = Microsoft.Win32.Registry.LocalMachine.CreateSubKey(@"SOFTWARE\MapInfo\MapXtreme\6.8.0");

keySamp.Close();

完整代码示例

1 string strPath=Application.StartupPath;
2 strPath=strPath.Substring(0,strPath.LastIndexOf(Path.DirectorySeparatorChar)); // get rid of \Debug
3 strPath=strPath.Substring(0,strPath.LastIndexOf(Path.DirectorySeparatorChar)+1) // get rid of \bin
4                     + "Data" + Path.DirectorySeparatorChar;
5 if (File.Exists(strPath + strFName)==false)
6 {
7     // check the registry for a known sample data search path
8     Microsoft.Win32.RegistryKey keySamp = Microsoft.Win32.Registry.LocalMachine.CreateSubKey(@"SOFTWARE\MapInfo\MapXtreme\6.8.0");
9     if (keySamp != null)
10     {
11         string s = (string)keySamp.GetValue("SampleDataSearchPath");
12         keySamp.Close();
13
14                 if (s == null) { s = Environment.CurrentDirectory; }
15                 else
16                 {
17                       if (s.EndsWith(Path.DirectorySeparatorChar.ToString()) == false)
18                       {
19                             s += Path.DirectorySeparatorChar;
20                       }
21
22                       strPath = s;
23                  }
24     }
25 }

MapInfo.Geometry.DPoint ctr=mapControl1.Map.Center;
MapInfo.Geometry.Distance z=mapControl1.Map.Zoom;

if (File.Exists(strPath+strFName))
    {
     mapControl1.Map.Load(new MapTableLoader(strPath + strFName));
     mapControl1.Map.Center=ctr;
     mapControl1.Map.Zoom=z;  //地图缩放比例
    }
    else
    {
     txtResults.Text="Couldn't find table: \r\n"
      + strPath + strFName
      + "\r\n\r\nTo enable this function, copy the relevant files "
      + "to the above location, or reinstall the sample data.\r\n\r\n";
    }
关于FeatureLayer的

1 FeatureLayer lyrTemp=(FeatureLayer) mapControl1.Map.Layers["Temp"];
2 if (lyrTemp!=null)
3 {
4     IFeatureEnumerator fen = (lyrTemp.Table as IFeatureCollection).GetFeatureEnumerator();
5     int n=0;
6     while (fen.MoveNext()) n++;
7     txtNumObjects.Text=n.ToString();
8 }

显示选定的图元?图层个数：

1
2             IEnumerator se = MapInfo.Engine.Session.Current.Selections.GetEnumerator();
3             int i=0;
4             while (se.MoveNext()) i+= ((Selection)se.Current).TotalCount;
5             txtNumSelected.Text=i.ToString();