Question

I’m trying to insert some data in my database using Entity Framework model, but for some unknown reasons to me, it does nothing.

Am I missing something here?

using (var context = new DatabaseEntities())
{
    var t = new test
    {
        ID = Guid.NewGuid(),
        name = "blah",
    };
    context.AddTotest(t);
    context.SaveChanges();
}

Answer 1

It should be:

context.TableName.Add(TableEntityInstance);

For versions of entity framework before 6, it was:

context.TableName.AddObject(TableEntityInstance);

Where:

1. TableName: the name of the table in the database.
2. TableEntityInstance: an instance of the table entity class.

If your table is Orders, then:

Order order = new Order();
context.Orders.Add(order);

For example:

 var id = Guid.NewGuid();
    
 // insert
 using (var db = new EfContext("name=EfSample"))
 {
    var customers = db.Set<Customer>();
    customers.Add( new Customer { CustomerId = id, Name = "John Doe" } );
  
    db.SaveChanges();
 }

Here is an example:

public void UpdatePlayerScreen(byte[] imageBytes, string installationKey)
{
  var player = (from p in this.ObjectContext.Players where p.InstallationKey == installationKey select p).FirstOrDefault();

  var current = (from d in this.ObjectContext.Screenshots where d.PlayerID == player.ID select d).FirstOrDefault();

  if (current != null)
  {
    current.Screen = imageBytes;
    current.Refreshed = DateTime.Now;

    this.ObjectContext.SaveChanges();
  }
  else
  {
    Screenshot screenshot = new Screenshot();

    screenshot.ID = Guid.NewGuid();
    screenshot.Interval = 1000;
    screenshot.IsTurnedOn = true;
    screenshot.PlayerID = player.ID;
    screenshot.Refreshed = DateTime.Now;
    screenshot.Screen = imageBytes;

    this.ObjectContext.Screenshots.Add(screenshot);
    this.ObjectContext.SaveChanges();
  }
}