Data Context error when saving data to database .NET 5.0-CodePudding

I have a little problem saving data in the database. In a given method, I make a request to an API, serialize the data, and try to save to the database, as shown in the image, but I end up getting an error referring to the application's DataContext, saying:

System.InvalidOperationException: The instance of entity type 'Launch ' cannot be tracked because another instance with the same key value for {'id'} is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached.

Consider using 'DbContextOptionsBuilder.EnableSensitiveDataLogging' to see the conflicting key values.

Any tips on how to resolve this issue?

CodePudding user response：

Maybe your list contains duplicates. EF does not allow to track entites with same key. If you have that error, try

_context.Entry(<entity>).State = EntityState.Detached;

CodePudding user response：

I can see in your Article class

[DatabaseGenerated(DatabaseGeneratedOption.None)] 
public int id { get; set; }

Try to change it

[Key]
public int id { get; set; }