将数据插入表“无法更新实体集”时出错

Question

I am trying to save the data in the database. Table name is product_color .

public void PostAddColour1()
{
     product_color pc = new product_color();
     pc.id = 999;
     pc.product_id=2;
     pc.color_id=1;
     pc.display_order=3;
     db.product_color.Add(pc);
     db.SaveChanges();
}

This is the function code to insert the data into table.

when db.SaveChanges(); is called the below error shows:

Unable to update the EntitySet 'product_color' because it has a
DefiningQuery and no <InsertFunction> element exists in the 
ModificationFunctionMapping> element to support the current operation.

Answer 1

This usually happens when you have not defined any primary key on your table. When a table doesn't have a PK then the Entity Framework considers it to be a View and not a table and hence it doesn't allow data to be directly inserted to it.

Simply set a Primary Key on the table. That should do the trick

You can read more on this here