Entity Framework Update Error
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack entity framework 6 update record Overflow the company Business Learn more about hiring developers or posting ads with us entity framework update without select Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community entity framework update model from database of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Entity Framework 6 Add/Update - Error while edit and try to add edited entity as new entity framework update multiple records one up vote 2 down vote favorite I have a model like below public class XYZModel { public string Id; // GUID, primary key; public string Name; public string AssociationId; // GUID, AllowNull; } what I am doing.. This is working fine XYZModel abc = new XYZModel(); abc.Id = Convert.ToString(Guid.NewGuid()); abc.Name = "ABC Name"; xyzDbContext.XYZModels.Add(abc); xyzDbContext.SaveChanges(); What is my goal ? Get entity by id, Edit it, Change its primary key Id
Entity Framework Update Child Collection
value, and add it as a new entry. but error occurred while adding. XYZModel xyz = xyzDbContext.XYZModels.Find("xyzguid"); //modifying it xyz.AssociationId = xyz.Id; xyz.Id = Convert.ToString(Guid.NewGuid()); xyz.Name = "New Name"; //trying to add it as new entry xyzDbContext.XYZModels.Add(xyz);// Error xyzDbContext.SaveChanges(); It throw an error The property 'Id' is part of the object's key information and cannot be modified. c# .net entity-framework share|improve this question asked Mar 8 '14 at 10:54 vikrantx 277417 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted You can do that only if the xyz object is detached from Context. Two ways to do that: XYZModel xyz = xyzDbContext.XYZModels.Find("xyzguid"); xyzDbContext.Entry(xyz).State = EntityState.Detached; Or using AsNoTracking.FirstOrDefault XYZModel xyz = xyzDbContext.XYZModels.AsNoTracking().FirstOrDefault(s => s.Id =="xyzguid"); Your code with first approach: XYZModel xyz = xyzDbContext.XYZModels.Find("xyzguid"); xyzDbContext.Entry(xyz).State = EntityState.Detached; //modifying it xyz.AssociationId = xyz.Id; xyz.Id = Convert.ToString(Guid.NewGuid()); xyz.Name = "New Name"; //trying to add it as new entry xyzDbContext.XYZModels.Add(xyz);// No Error xyzDbContext.SaveChanges(); Note: You must use DatabaseGeneratedOption.None annotation on Id property. share|improve this answer edited Mar 8 '14 at 22:58 answered Mar 8 '14 at 22:52 ramaral 4,30531641 add a comment| up vote 1 down vote Entity Framework tracks objects as you edit them. If you want a new row inserted into the database, create a new ob
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Entity Framework Update Model From Database Not Working
Us Learn more about Stack Overflow the company Business Learn more about hiring entity framework update multiple rows developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the entity framework update stored procedure Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Entity Framework - Update Error http://stackoverflow.com/questions/22268343/entity-framework-6-add-update-error-while-edit-and-try-to-add-edited-entity-as up vote 0 down vote favorite I am constantly getting an error when I try to edit the same record for the second time using Entity Framework: Attaching an entity of type 'DomainClasses.Item' failed because another entity of the same type already has the same primary key value. This can happen when using the 'Attach' method or setting the state of an entity to 'Unchanged' or http://stackoverflow.com/questions/24539876/entity-framework-update-error 'Modified' if any entities in the graph have conflicting key values. This may be because some entities are new and have not yet received database-generated key values. In this case use the 'Add' method or the 'Added' entity state to track the graph and then set the state of non-new entities to 'Unchanged' or 'Modified' as appropriate. Code is very simple: public void InsertOrUpdate(Item entity) { if (entity.Id == default(int)) { _context.SetAdd(entity); } else { _context.SetModified(entity); } _context.SaveChangesAsync(); } entity-framework share|improve this question edited Jul 2 '14 at 19:57 christiandev 10.9k82354 asked Jul 2 '14 at 19:53 Satyajit 237111 Can you put a breakpoint on _context.SetModified(entity) and confirm that it is being called. –david004 Jul 3 '14 at 6:47 Yes, it is being called. –Satyajit Jul 6 '14 at 9:48 Do you set the ID to a non-default value that is different for all entities after creation? –Richard Jul 12 '14 at 10:18 finally, I solved this issue by creating a new instance of the context before saving the edit. –Satyajit Jul 28 '14 at 8:20 You might have a look at my answer on ASP.NET
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of http://stackoverflow.com/questions/4158731/entity-framework-update-error this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask http://www.dotnetcurry.com/entityframework/619/add-update-delete-objects-entity-framework Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up entity framework Entity Framework Update error up vote 3 down vote favorite I am getting a voialation of Primary key error with the following code. I can't see for looking as to why this may be and I need to sort it out. Can anybody help with a fresh pair of eyes? var events = (from e in nodes.Descendants("event") select new Event { Event_ID = entity framework update int.Parse(e.Attribute("event_id").Value), Name = e.Attribute("name").Value, Code = e.Attribute("code").Value, Minute = e.Attribute("minute").Value != String.Empty ? int.Parse(e.Attribute("minute").Value) : 0, Minute_Extra = e.Attribute("minute_extra").Value != String.Empty ? int.Parse(e.Attribute("minute_extra").Value) : 0, Team = GetTeam(e.Attribute("team_id")), Last_Updated = DateTime.Parse((FormatDateTime(e.Attribute("last_updated").Value))) }); foreach (Event matchEvent in events) { //Check to see if this event exists if (match.Events.Any(o => o.Event_ID == matchEvent.Event_ID)) { Event theEvent = (from m in match.Events where m.Event_ID == matchEvent.Event_ID select m).FirstOrDefault(); //There is an event with this ID, so check its last updated flag if (theEvent.Last_Updated < matchEvent.Last_Updated) { //Update the current event theEvent.Event_ID = matchEvent.Event_ID; theEvent.Name = matchEvent.Name; theEvent.Code = matchEvent.Code; theEvent.Minute = matchEvent.Minute; theEvent.Minute_Extra = matchEvent.Minute_Extra; theEvent.Team = matchEvent.Team; theEvent.Last_Updated = matchEvent.Last_Updated; } } //If the event is not there we need to add it else { match.Events.Add(matchEvent); } myDb.SaveChanges(); UPDATE 1: The following is the error I get when SaveChanges() is called: {"Violation of PRIMARY KEY constraint 'PK_Matches_1'. Cannot insert duplicate key in object 'dbo.Matches'.\r\nThe statement has been terminated."} UPDATE 2: I am not using identity insert on the DB table for this as this is an import from a 3rd party Web Service where I need to retain a
Interview Q&A .NET Product Reviews Download .NET Magazines .NET Magazines Write For Us About Contact .NET & JavaScript Tools Add, Update and Delete Objects in Entity Framework 4.0 Posted by: Suprotim Agarwal , on 12/11/2010, in Category Entity Framework Views: 550050 Tweet Abstract: In this article, we will see how to Add, Update and Delete objects in our conceptual Entity model and push the changes to the underlying database. In a previous article, we saw how toCreate an Entity Framework Model and Use it in Multiple Projects. In this article, we will see how to Add, Update and Delete objects in our conceptual model and push the changes to the underlying database. We will be using the same console application that we created in the previous article, so make sure you have read the previous article before we continue. We will be adding three methods to the console application: addCustomer(), deleteCustomer() and modifyCustomer() Create and Add Objects in Entity Framework 4.0 In order to add new objects to the Entity Set, you must create an instance of an Entity type and add the object to the object context. Objects attached to the object context are managed by that object context. Now there are three ways to add a new object to the object context: 1. Use ObjectSet