InsertAllOnSubmit only inserts first data record

Question

I noticed a strange behaviour in my Import Service today when I tried to import multiple data records.

When I do it like this, all data records are imported and the auto-incremented value is correct (see screenshot):

public void Create(List<Property> properties)
{
    foreach (Property prop in properties) {
     dbc.Property.InsertOnSubmit(prop);
     dbc.SubmitChanges();
    }
}

When I try it like this, only the first data record get's a correct auto-incremented value (see screenshot):

foreach (Property prop in properties) {
    dbc.Property.InsertOnSubmit(prop);
}
dbc.SubmitChanges();

Same here:

dbc.Property.InsertAllOnSubmit(properties);
dbc.SubmitChanges();

Does anybody have an idea why it's like that? All three variants should import all data records according to my understanding, but the missing auto-incremented values indicate it's not that way.

[EDIT] Added two screenshots.

Answer 1

Not quite sure why the 2nd variation doesn't work, however, shouldn't the last one be:

dbc.Property.InsertallOnSubmit(properties);
dbc.SubmitChanges();

Edit

For the second loop try:

foreach (Property prop in properties) 
{   
    var newProp = new Property();
    newProp = prop;
    dbc.Property.InsertOnSubmit(newProp);
}
dbc.SubmitChanges();

For the last solution try:

dbc.Property.InsertAllOnSubmit(properties.ToList());
dbc.SubmitChanges();

Answer 2

I am having the same problem. I wonder if it is related to .Net3.5 SP1 because I'm sure this was working before. But I'm not sure the problem is precisely correlated with the SP1 upgrade.

Answer 3

As other users are having the same strange behaviour, I've reported the issue as a bug to Microsoft:

https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=483711

Answer 4

I had the same problem and it turned out the issue was due to overriding Equals on the mapped class. My Equals method was only comparing the primary key field which was an identity field. Of course when the objects are new, all identities are 0. So when InsertAllOnSubmit was called, it thought that all new objects were the same and basically ignored every one but the first.