private static void Cast()
{
//UpCast
var localDbConnection = new LocalDataBaseConnection("name", "name");
DataBaseConnection dbConnection = localDbConnection; //success with no issues as DataBaseConnection is parent class.
object obj = localDbConnection; //success with no issues as object is parent class of all the other classes.
//Downcast/Direct cast
DataBaseConnection dbConnection1 = (DataBaseConnection)obj; // cast is successfull as we have stored in obj variable reference on local db connection.
LocalDataBaseConnection localDataBaseConnection1 = (LocalDataBaseConnection)dbConnection1; // cast is successfull as we have stored in dbconnection1 variable reference on local db connection.
object obj1 = "Hello, i am not database connection";
DataBaseConnection dbConnection2 = (DataBaseConnection)obj1; //compiles, but will fail on runtime.
if (obj1 is DataBaseConnection connection)
{
connection.Open();
}
else
{
// handle not expected onject type.
}
//Other direct casts;
int a = 12;
short b = (short)a;
double d = a;
a = (int)d;
}
private static void Polymorph()
{
var localConnection = new LocalDataBaseConnection("name", "name");
var remoteConnection = new RemoteDataBaseConnection("name", "name");
localConnection.Open();
remoteConnection.Open();
localConnection.ExecuteSqlCommand("Some sql command.");
remoteConnection.ExecuteSqlCommand("Some sql command.");
localConnection.Close();
remoteConnection.Close();
Console.ReadLine();
}
