How to add items to an existing list using AddRange

Question

Am trying to update records and save changes to the database and it seems as i can't because i cannot get my list. sorry if my question is not clear.

Let me know if there's other way i can do it.

List<ClaimHistoryModel.ClientLog> ClaimLogs = new    List<ClaimHistoryModel.ClientLog>();
using (SidDbContext db = new SidDbContext())
    {
        var oldClaim = db.Client.FirstOrDefault(x => x.ClaimId == clientModel.ClaimId);

        oldClaim.CellNumber = clientModel.CellNumber;

        ClaimLogs = GetClaimLog(db); //here am getting a method which update the Logtbl.(all the changes will be saved) no error on this funstion
      //it works if i save changes here but it won't update the history table which shows the fieds before and after.            
       db.claimAudit.AddRange(ClaimLogs ); Error here
       db.SaveChanges();
    }

Am getting this error:

Cannot convert from System.Collections.Generic.List<ClaimHistoryModel.ClientLog> to System.Collections.Generic.IEnumerable<claimAudit>

The error seems pretty clear. You're trying to add a collection of `MyModel` items to a list of `claimAudit` objects. — D Stanley, Jun 13 '16 at 13:22
Mymodel != claimAudit. Unless `Mymodel` inherits `claimAudit`, this can't be done like this. — Zohar Peled, Jun 13 '16 at 13:23
The OP did not say what the types were, MyModel and claimAudit didn't exist — Berin Loritsch, Jun 13 '16 at 13:24
Umm. Where is `List` come from? I see `List ClaimLogs`. Also, where does `IEnumerable` come from? There's nothing in the code presented that suggests that is what the types are. Don't add information that isn't there if you are editing. — Berin Loritsch, Jun 13 '16 at 13:26
I am not sure on how i can fix this going forward. I just need a way to add to the list and save changes — Mpho, Jun 13 '16 at 13:26
@BerinLoritsch i didn't want to copy the whole the..but atleast you have all the info now — Mpho, Jun 13 '16 at 13:28
The main exception says, `You can't add Mymodel objects to a list of claimAudit` — Jeroen van Langen, Jun 13 '16 at 13:28
@JeroenvanLangen I looked at the original message, and the types **were not specified** in the error message. Instead of adding what we assume are the types, we need to have the OP tell us exactly what they were. — Berin Loritsch, Jun 13 '16 at 13:30
Possible duplicate of [List.AddRange(List) Doesn't Work](http://stackoverflow.com/questions/3343246/listijob-addrangelistjob-doesnt-work) — Berin Loritsch, Jun 13 '16 at 14:24

score 0 · Answer 1 · answered Jun 14 '16 at 09:53

That will never work. You cannot add a ClientLog collection to a collection that expects ClaimAudit.That's the same as trying to add an object of type Order to a collection of objects of type User.I hope I'm making sense...

The example below will work because db.claimAudit.AddRange() expects two things:

An IEnumerable
An IEnumerable of type ClaimAudit

And List<ClaimAudit> satisfies both those conditions.As soon as you change List<ClaimAudit> to List<ClientLog> you are violating point 2 and the code will break

var claimAudits = new List<ClaimAudit>();
var claim1 = new ClaimAudit();
var claim2 = new ClaimAudit();
claimAudits.Add(claim1);
claimAudits.Add(claim2);

db.claimAudit.AddRange(claimAudits);

Maybe you actually need to insert claim logs instead of claim audits, if that's the case then just change this line:

db.claimAudit.AddRange(ClaimLogs);

to this:

db.claimLogs.AddRange(ClaimLogs);

How to add items to an existing list using AddRange

1 Answers1