1) When the data is bound, the data source association field is specified in DataSets.Add, and the map associated field is specified in the Geodictionary. Binding multiple data sets, the data set of the layer is also the data set of the map 4) In order to make the temporary layer that creates dynamically does not interfere with each other, use the status object as much as possible (different session has different temporary layers, even the name Same); For a permanent layer, the different session is shared, and the shared problem must be handled 5) The status object does not remember the status of the layer Selection, so after moving the map, select will fail. You can solve this problem by establishing a temporary layer 6) Different primitives (text, symbols, lines, regions) can coexist with a layer, but it is best not to
