Abstract Factory control EF context Singleton

Public class objectcontextfactory
{
Public static system. Data. Objects. objectcontext getcurrentobjectcontext ()
{
// Obtain the EF context from the callcontext data slot
Objectcontext = callcontext. getdata (typeof (objectcontextfactory). fullname) as objectcontext;
If (objectcontext = NULL)
{
// If no EF context exists in the callcontext data slot, the EF context is created and saved to the callcontext data slot.
Objectcontext = new ceridtadbentities (); // when the database is replaced with MySQL, you only need to change the context at the next EF.
Callcontext. setdata (typeof (objectcontextfactory). fullname, objectcontext );
}
Return objectcontext;
}
}