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Why does Entity Framework reinsert existing entity framework?
TopicId’s value is that of the selected item from the DropDownList. Because the query string name matches the Screencast’s property name, ASP.NET MVC model binding uses the value for the TopicId property of the Screencast instance it creates for the method parameter, as you can see in Figure 4.
When to set topic to null in Entity Framework?
And again, the EntityState of the Topic instance creates confusion: EF will insert a new Topic and use the value for that new row’s Id when it inserts the Screencast. The safest way to avoid this is to set the Topic property to null when you set the foreign key value.
How to insert screencast entity in Entity Framework?
Entity Framework can use the foreign key property to directly set the table’s TopicId. Then it’s simple (and faster) for EF to create an insert method for the Screencast entity including the TopicId (in my case, the value 2): exec sp_executesql N’insert [dbo].
How does Entity Framework set the topicid?
Entity Framework can use the foreign key property to directly set the table’s TopicId. Then it’s simple (and faster) for EF to create an insert method for the Screencast entity including the TopicId (in my case, the value 2):
How to insert data using Entity Framework model?
I’m trying to insert some data in my database using Entity Framework model, but for some unknown reasons to me, it does nothing. Am I missing something here? TableName: the name of the table in the database. TableEntityInstance: an instance of the table entity class.
How are reference lists handled in Entity Framework?
However, if you’re working with disconnected data the behavior is quite different, and this has surprised many developers. A common pattern that I use for handling reference lists is to use a separate context, which would no longer be in scope by the time you saved any user modifications.