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Entity Framework : update user fails


Entity Framework : update user fails

By : P.Cheng
Date : November 20 2020, 11:01 PM
this will help The ConcurrencyStamp is there to prevent two people from making two different changes to the same user without being aware of one another's changes.
code :
    /// <summary>
    /// A random value that must change whenever a user is persisted to the store
    /// </summary>
    public virtual string ConcurrencyStamp { get; set; } = Guid.NewGuid().ToString();
builder.Entity<TUser>(b =>
{
....
    b.Property(u => u.ConcurrencyStamp).IsConcurrencyToken();
....


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Using MVC2 to update an Entity Framework v4 object with foreign keys fails

Using MVC2 to update an Entity Framework v4 object with foreign keys fails


By : Eyal Golan
Date : March 29 2020, 07:55 AM
help you fix your problem I suspect it's tripping up on the OrderItemStatus. There is no way the formValues can contain the necessary OrderItem object, and thus the call to UpdateModel cannot possibly update it correctly. Perhaps it's setting it to null and orphaning an OrderItemStatus object in the process.
Before calling save changes, dump the contents of the ObjectStateEntries and take a look at what it's trying to save back to the database using code like:
code :
var items = context.ObjectStateManager.GetObjectStateEntries(System.Data.EntityState.Added | System.Data.EntityState.Modified);
foreach (var item in items)
{
  ...
Entity Framework Update Fails for Entity With ID of 0

Entity Framework Update Fails for Entity With ID of 0


By : user3243003
Date : March 29 2020, 07:55 AM
may help you . You have to do something about this zero ID value. It's a ticking time bomb.
You'll always have to be on your guard because it definitely is expected behaviour. EF has inner logic depending on key default values. In EF6 you could do this because it was less refined. (In this area that is).
code :
context.Update(entity);
context.Entry(entity).State = EntityState.Modified;
Edit Action in ASP.NET MVC Controller fails to update changes to Entity Framework entity

Edit Action in ASP.NET MVC Controller fails to update changes to Entity Framework entity


By : Denis Korh
Date : March 29 2020, 07:55 AM
To fix the issue you can do So I have a view bound to an entity (tblOutreachSpecialist). When that view posts back to the server, it sends back an instance of that entity (again, the entity tblOutreachSpecialist) with the changes recorded. , Did you try removing specold = spec;?
Entity Framework ObjectContext.SaveChanges fails on unique key column update

Entity Framework ObjectContext.SaveChanges fails on unique key column update


By : Linh Pussie
Date : March 29 2020, 07:55 AM
help you fix your problem Unless you call SaveChanges() twice, no, there is no way to control the order of SQL statements Entity Framework will send to the database. You could wrap the multiple SaveChanges() calls into an outer transaction to ensure still a transactional behaviour for the whole operation:
Entity Framework: Add-Migration fails with Unable to update database

Entity Framework: Add-Migration fails with Unable to update database


By : Pablo Malpasso
Date : March 29 2020, 07:55 AM
may help you . You can reset the entity framework to solve your problem [But keep it mind it will bring the Migration to the default state]
Note: To take a backup before performing the following
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