Load can only be called when the EntityCollection or EntityReference does not contain objects

MySQL with Entity Framework - what am I doing wrong?

I got past this error by adding a reference to MySql.Data.Entity.dll (and MySql.Web.dll)

ObjectStateManager does not contain an ObjectStateEntry with a reference to an object of type

So it already belongs to a context,and you should update that context. It can't be attached to new context, You can create a new instance of updatedApplication and copy all properties of updatedApplication to this new one and attach new entity to application....Also change ... if (newApp .EntityState == EntityState.Detached) _DatabaseC...

Warning: "... overrides Object.Equals(object o) but does not override Object.GetHashCode()"

As others have said, the use of Reflection in Equals seems dodgy. Leaving that aside, let's concentrate on GetHashCode. ...The primary rule for GetHashCode that you must not violate is ...if two objects are equal then they must both have the same hash code.... Or, an equivalent way of saying that is ...if two objects have different hash codes then ...

Entity Framework Eager Load Not Returning Data, Lazy Load Does

This is a common confusion. The opposite of lazy loading is: ...no... loading ...unless... you explicitly do the loading yourself (e.g. by eager loading using ...Include...)....So if you turn off lazy loading in any way — removing the ...virtual... modifier is one of them — the behaviour does not turn into ...eager loading... but ...no loading....

Calling SaveChanges when database objects have not been changed

EF6 uses the change tracker to detect if there are any changes.... When you do a call to SaveChanges(), one of the first things EF6 is doing is calling DetectChanges() which will inspect the change tracker....Now suppose you really want to know if something has changed you can look in the changetracker yourself too. This post shows how in the answe...

entity framework does not load navigation property after adding object

That's because you're simply setting the foreign-key property (...Stage.EmployeeID...) without setting the navigation-property (...Stage.Employee...)....Usually, after calling ...SaveChanges()..., EF would update the navigation property as well. But, since the ...Stage... object is created manually by you it's not tracked (using a DynamicProxy) and...

Entity Framework 6 not loading Navigation Properties (lazy Loading)

okay. after some research i found out, that just the team entity didn't exist because of inconsistent data / a broken database....Thank you for your help....The solution with ".Include("Teams.Team.Game")" did the trick as well

How to load jquery datatable using Ajax call, Loading table details from multiple tables (Master, Detail)

well written articles regarding this topic, I would start ...here...then ...here... , there is part ...3... and ...4... also you can check, i think this tutorials pretty much covered all the basics you want to know about datatable plugin...keep in mind you will find a lot of examples ...here...if you already know how to use datatable but you just w...

Navigation properties not loading - eager Loading

I feel like you might not have told EF what the foreign keys are. Where is the mapping class that is telling EF this link? If you don't have this, please just add [ForeignKey("DepartmentID")] attribute above the Department navigation property on Subject and see if that fixes your issue, new Department or not. :)

Initial and final period must contains a date and not contains in other date

If you only want the documents that expired in 2018 then I'm assuming you only need to look at the end dates. ...This query will find documents that have a ...NextDate... that falls within your search. Note: I used ...let... to avoid redundant calls to ...DbFunctions.TruncateTime.......var expiredDocuments = from document in db.Documents.AsNoTrack...