21 Next entity: Edition with Identity field (Wpf, Xamarin) - chempkovsky/CS2WPF-and-CS2XAMARIN GitHub Wiki

According to the Database structure (https://github.com/chempkovsky/CS2WPF/wiki/05-database-structure-for-which-we-are-creating-the-application)

And according to the rules defined in the article "06 Development Process Cycle" (https://github.com/chempkovsky/CS2WPF/wiki/06-The-development-process-cycle)

we can start with any entity from the list: Edition, Genre, Country and Language

Let's continue with Edition

• Step #1:
  • Run Visual Studio and Open “WpfDemo” solution
    • Right Click “Literature” of the “Dm01Entity”-project
    • Select “Add/Class” menu item
    • In the dialog enter the name for the class
    • LitEdition
    • Click “Add”
• Step #2:
  • Open LitEdition file and modify the body of the class as it is shown on the slide

public class LitEdition
{
 [Key]
 [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
 [Display(Description = "Row id", Name = "Id of the edition", Prompt = "Enter Id of the edition", ShortName = "Edition Id")]
 [Required]
 public int EditionId { get; set; }

 [Display(Description = "Name of the edition", Name = "Name of the edition", Prompt = "Enter the Name of the edition", ShortName = "Edition Name")]
 [StringLength(40, MinimumLength = 3)]
 public string EditionName { get; set; }
}

Note:

we have two new attributes

• [key] attribute
• [DatabaseGenerated(DatabaseGeneratedOption.Identity)] attribute

It's highly recommended not to use [key] attribute. Use Fluent Api instead. CS2WPF wizards trust FluentApi more than [key] attribute.