45 Next entity: Dialect with One to many relations (Wpf, Xamarin) - chempkovsky/CS2WPF-and-CS2XAMARIN GitHub Wiki
According to the Database structure (https://github.com/chempkovsky/CS2WPF-and-CS2XAMARIN/wiki/05-database-structure-for-which-we-are-creating-sample-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 continue with any entity from the list: Dialect, Publisher and Author
Let's continue with Dialect
- 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
- LitDialect
- Click “Add”
- Run Visual Studio and Open “WpfDemo” solution
- Step #2:
- Open LitDialect file and modify the body of the class as it is shown on the slide
public class LitDialect
{
[Display(Description = "Dialect Id", Name = "Dialect Id", Prompt = "Dialect Id", ShortName = "Id")]
[StringLength(14, MinimumLength = 5)]
[Required]
public string DialectId { get; set; }
[Display(Description = "Dialect Name (no more than 40 characters in length)", Name = "Dialect Name", Prompt = "Enter Dialect Name", ShortName = "Dialect")]
[StringLength(52, MinimumLength = 2)]
[Required]
public string DialectName { get; set; }
[Display(Description = "Country Iso 3 code", Name = "Country Iso 3 code", Prompt = "Enter Country Iso 3 code", ShortName = "Country Iso 3")]
[StringLength(3, MinimumLength = 3)]
[Required]
public string Iso3CntrRef { get; set; }
[Display(Description = "Country Iso 2 code", Name = "Iso 2 code", Prompt = "Enter Country Iso 2 code", ShortName = "Country Iso 2")]
[StringLength(3, MinimumLength = 2)]
[Required]
public string Iso2CntrRef { get; set; }
public LitCountry Country { get; set; }
[Display(Description = "Language Iso 3 code", Name = "Iso 3 code", Prompt = "Enter Language Iso 3 code", ShortName = "Language Iso 3")]
[StringLength(3, MinimumLength = 3)]
[Required]
public string Iso3LngRef { get; set; }
[Display(Description = "Language Iso 2 code", Name = "Iso 2 code", Prompt = "Enter Language Iso 2 code", ShortName = "Language Iso 2")]
[StringLength(3, MinimumLength = 2)]
[Required]
public string Iso2LngRef { get; set; }
public LitLanguage Language { get; set; }
}
LitDialect
-class has two object-fileds:
public LitLanguage Language { get; set; }
and
public LitCountry Country { get; set; }
To complete master-detail declaration we have to modify LitCountry
and LitLanguage
classes
New declaration of LitCountry class must be as follows
public class LitCountry
{
//[Key]
//[Column("Iso3", Order = 0)] // zero-based order of the column the property is mapped to
[Display(Description = "Country Iso 3 code", Name = "Iso 3 code", Prompt = "Enter Iso 3 code", ShortName = "Iso 3")]
[StringLength(3, MinimumLength = 3)]
[Required]
public string Iso3 { get; set; }
//[Key]
//[Column("Iso2", Order = 1)]
[Display(Description = "Country Iso 3 code", Name = "Iso 2 code", Prompt = "Enter Iso 2 code", ShortName = "Iso 2")]
[StringLength(3, MinimumLength = 2)]
[Required]
public string Iso2 { get; set; }
[Display(Description = "Country Name (no more than 30 characters in length)", Name = "Country Name", Prompt = "Enter Country Name", ShortName = "Country")]
[StringLength(40, MinimumLength = 3)]
[Required]
public string CountryName { get; set; }
public List<LitDialect> Dialects { get; set; }
}
with Dialects
-property added to the declaration of LitCountry class
public List<LitDialect> Dialects { get; set; }
New declaration of LitLanguage class must be as follows
public class LitLanguage
{
//[Key]
//[Column("Iso3", Order = 0)] // zero-based order of the column the property is mapped to
[Display(Description = "Language Iso 3 code", Name = "Iso 3 code", Prompt = "Enter Iso 3 code", ShortName = "Iso 3")]
[StringLength(3, MinimumLength = 2)]
[Required]
public string Iso3 { get; set; }
//[Key]
//[Column("Iso2", Order = 1)]
[Display(Description = "Language Iso 3 code", Name = "Iso 2 code", Prompt = "Enter Iso 2 code", ShortName = "Iso 2")]
[StringLength(3, MinimumLength = 2)]
[Required]
public string Iso2 { get; set; }
[Display(Description = "Language Name (no more than 30 characters in length)", Name = "Language Name", Prompt = "Enter Language Name", ShortName = "Language")]
[StringLength(27, MinimumLength = 2)]
[Required]
public string LanguageName { get; set; }
public List<LitDialect> Dialects { get; set; }
}
with Dialects
-property added to the declaration of LitLanguage class
public List<LitDialect> Dialects { get; set; }
- we are going to define entity with one-to-many relations
It's highly recommended not to use [ForeignKey] and [InverseProperty] attributes. Use Fluent Api instead. CS2WPF wizards trust FluentApi more than [ForeignKey] and [InverseProperty] attributes.