外鍵C＃MVC 5？

Question

我想將字符串字段關聯為外鍵，請給我幫助！

catalogtype.code => catalog.typeCatalogRefCode

public class CatalogType : AuditFields
{
    [Key]
    public int id { get; set; }
    public string name { get; set; }
    public string description { get; set; }
    public string code { get; set; }
    public bool passive { get; set; }
    public ICollection<Catalog> Catalogs { get; set; }

}

public class Catalog : AuditFields
{
    [Key]
    public int id { get; set; }
    public string value { get; set; }
    public string description { get; set; }
    public string code { get; set; }
    public bool passive { get; set; }
    public int order { get; set; }
    public string typeCatalogRefCode { get; set; }
    public virtual CatalogType catalogType { get; set; }
}

................................................... .......................

public class AuditFields
{
    public DateTime createdDate { get; set; }
    public string createdBy { get; set; }
    public string createdIn { get; set; }
    public DateTime modifiedDate { get; set; }
    public string modifiedBy { get; set; }
    public string modifiedIn { get; set; }
}

Answer 1

您好，您需要在dbcontext類的重寫方法OnModelCreating上編寫代碼。 請參考以下代碼。

public class CatalogContext : DbContext
{
    static CatalogContext()
    {
        Database.SetInitializer(new DropCreateDatabaseIfModelChanges<CatalogContext>());
    }
    public DbSet<CatalogType> CatalogTypes{ get; set; }
    public DbSet<Catalog> Catalogs{ get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelbuilder.Entity<Catalog>().HasOptional(a=>a.catalogType)
                            .WithMany(au=>au.Catalogs)
                            .HasForeignKey(a=>typeCatalogRefCode);
    }
}

Answer 2

請參考以下類結構。 為了使“ typeCatalogRefCode”成為外鍵，您需要定義“ code”作為鍵

class MyDBContext:DbContext
{
    public MyDBContext()
        : base("mydbcontext")
    {

    }
    static MyDBContext()
{
    Database.SetInitializer(new DropCreateDatabaseIfModelChanges<MyDBContext>());
}

public DbSet<CatalogType> CatalogTypes{ get; set; }
public DbSet<Catalog> Catalogs{ get; set; }
}
public class CatalogType : AuditFields
{

    public int id { get; set; }
    public string name { get; set; }
    public string description { get; set; }
            [Key]
    public string code { get; set; }
    public bool passive { get; set; }
    public ICollection<Catalog> Catalogs { get; set; }

}

public class Catalog : AuditFields
{
    [Key]
    public int id { get; set; }
    public string value { get; set; }
    public string description { get; set; }
    public string code { get; set; }
    public bool passive { get; set; }
    public int order { get; set; }
    public string typeCatalogRefCode { get; set; }
      [ForeignKey("typeCatalogRefCode")]
    public virtual CatalogType catalogType { get; set; }
}
public class AuditFields
{
    public DateTime createdDate { get; set; }
    public string createdBy { get; set; }
    public string createdIn { get; set; }
    public DateTime modifiedDate { get; set; }
    public string modifiedBy { get; set; }
    public string modifiedIn { get; set; }
}

Answer 3

Koderzzzz的答案是正確的，但只要完成，您還可以使用數據注釋：

public class CatalogType : AuditFields
{
    [Key]
    public int id { get; set; }
    public string name { get; set; }
    public string description { get; set; }
    public string code { get; set; }
    public bool passive { get; set; }
    [InverseProperty("catalogType")]
    public ICollection<Catalog> Catalogs { get; set; }

}

public class Catalog : AuditFields
{
    [Key]
    public int id { get; set; }
    public string value { get; set; }
    public string description { get; set; }
    public string code { get; set; }
    public bool passive { get; set; }
    public int order { get; set; }
    public string typeCatalogRefCode { get; set; }
    [ForeignKey("typeCatalogRefCode")]
    public virtual CatalogType catalogType { get; set; }
}