// Update an existing volunteer record based on their email address var volunteer = _context.Volunteers.SingleOrDefault(v => v.Email == "[email protected]"); if (volunteer != null) { volunteer.Name = "John Smith"; _context.AddOrUpdate(volunteer); _context.SaveChanges(); }
// Create a new event based on its unique identifier var eventId = Guid.NewGuid(); var newEvent = new Event { Id = eventId, Name = "Charity Walk", StartDateTime = DateTime.Now.AddDays(7), EndDateTime = DateTime.Now.AddDays(8), Location = "Central Park", }; _context.AddOrUpdate(e => e.Id == eventId, newEvent); _context.SaveChanges();In this example, the AddOrUpdate method is used to create a new event record in the database using a unique identifier. The code generates a new GUID for the event, creates a new Event object with some initial values, and uses the AddOrUpdate method to add the new record to the database. The method also takes a lambda expression as a parameter, which specifies the condition that needs to be matched for the record to be updated. In this case, since the record does not exist yet, the lambda expression will add a new record to the database. The AllReadyContext package library is a package provided by Microsoft that is used for managing data in the AllReady application. It is an Entity Framework Core DbContext that can be used to interact with a SQL Server database.