C#•3y ago

Ef insert many to many

How do I insert an new object to my database?
right now objects are like this:

c#
class order{ 
int id
List<product>
}

c#
class order{ 
int id
List<product>
}

c#
class order{ 
int id
List<product>
}

c#
class order{ 
int id
List<product>
}

c#
class orderproduct{
int orderid
int productId
}

c#
class orderproduct{
int orderid
int productId
}

c#
class orderproduct{
int orderid
int productId
}

c#
class orderproduct{
int orderid
int productId
}

c#
class Product{ 
int id
List<order>}

c#
class Product{ 
int id
List<order>}

c#
class Product{ 
int id
List<order>}

c#
class Product{ 
int id
List<order>}

so I want to add an order object with an list of products(that contain the id) but I get erros.
when I just use 1 of the same product: Cannot insert explicit value for identity column in table 'Products' when IDENTITY_INSERT is set to OFF.

when my list contains the same product twice:
'The instance of entity type 'Product' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked.

Not really sure how to fix it.... Can also use dapper if that's easier

Ef insert many to many

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