"Asp. Net 2.0 secrets" (15th)

ObjectDataSource Control

Five main attributes: TypeNmae SelectMethod UpdateMethod InsertMethod DeleteMethod;

* This control can represent any object. If this object does not support IEnumerable, it will be automatically packaged into the new object for its support;

* Use DataReader whenever possible

public sqlDataReader GetMovies(){  Sqlconnection con =new  ...  ...  con.open();  return cmd.Executereader(CommandBehavior.CloseConnection);}

* WebConfigurationManager. ConnectionStrings ["Movies"]. ConnectionString: Access connection string;

* If a parameter is required in the method bound to this control, the matching is automatically determined through reflection;

* The DataObjectTypeName attribute of DataObjectSource is invalid in the select method, and the class must have a constructor with or without parameters;

* General event organization method: process the insert operation in the ing event, and process the insert error information in the ed event to block the error;

* You can process the constructor with parameters in the OnObjectCreating event.

MoivesByCategroy movies=new MoviesByCategory("Adventure");e.ObjectInstance=moives;

* The above event is not triggered when a static method is called;

* Create a custom ObjectDataSource control Page 519