The property 'BookId' on entity type 'Library' has a temporary value. Either set a permanent value explicitly or ensure that the database is

What is the best way to set navigation property having only id in Entity Framework?

Modify a protected property for the ID using a mutator method:...public class MyEntity { public virtual int Id { get; set; } public virtual MySecondEntity SecondEntity { get; set; } [ForeignKey( "SecondEntity" )] protected virtual int? MySecondEntityId { get; set; } public void SetSecondEntityId( int? id ) { MySeco...

How to set another value on a boolean with defaut value with Entity Framework Core?

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I am having trouble creating DB in SQL Server Express with Entity Framework Core 2.0

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.NET - Set all Entity current values to new values without specifying separate properties

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How to specify default property values for owned entity types in Entity Framework Core 2.0?

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How to get all saved Entity values in DbContext either via Events or override SaveChangesAsync()

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DateTime.Now default value in entity configuration always sets the same DateTime in the database

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Temporary Value Error During Entity Framework Core Modify

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How to set class property's value to be set to generated id value of another class on insertion to database?

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The property 'myFk' on entity type 'Order' has a temporary value

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