如何在MVC上創建特定模型的歷史模型4

Question

我還是使用實體框架和MVC 4 Razor創建模型的新手。我在如何保存模型的歷史記錄時遇到問題。如何創建在特定表格或字段上有歷史記錄的模型？例如：如果我想創建關於學校變化的歷史記錄。它仍然不清楚我將如何創建保存歷史的模型。如何觸發我必須在具有相同數據的不同型號上執行保存功能？

非常感謝你提前。

如果任何人都可以成爲模型和模型歷史的簡單示例以及它如何運作，我將非常感激。像銷售或銷售歷史一樣。

這裏是我的代碼

---

一對多 公共類兒童 { [關鍵] 公衆詮釋childID的{獲得;組; }

[Required,Display(Name="Project Code")] 
    public string ProjectCode { get; set; } 

    public string Status { get; set; } 

    [DataType(DataType.Date)] 
    public DateTime StatusDate { get; set; } 

    public string FamilyName { get; set; } 
    public string GivenName { get; set; } 
    public string MiddleName { get; set; } 

    [DataType(DataType.Date)] 
    public DateTime Birthdate { get; set; } 

    public string Gender {get;set;} 
    public string Address { get; set; } 
    public string Section { get; set; } 
    public int SchoolLevelID { get; set; } 
    public int SchoolYearID { get; set; } 
    public int AreaID { get; set; } 
    public int SchoolID { get; set; } 
    public int GradeLevelID { get; set; } 

    //Foreign Key - One to Many 
    public virtual SchoolLevel SchoolLevel { get; set; } 
    public virtual SchoolYear SchoolYear { get; set; } 
    public virtual Area Area { get; set; } 
    public virtual School School { get; set; } 
    public virtual GradeLevel GradeLevel{get;set;} 

    //Child is foreign key at the table 
    public virtual ICollection<Guardian> Guardians { get; set; } 

} 


public class SchoolLevel 
{ 
    public int SchoolLevelID { get; set; } 
    public string SchoolLevelName { get; set; } 

    public virtual ICollection<Child> Children { get; set; } 
} 

public class SchoolYear 
{ 
    public int SchoolYearID { get; set; } 
    public string SchoolYearName { get; set; } 

    public virtual ICollection<Child> Children{get;set;} 
} 

public class Area 
{ 
    public int AreaID{get;set;} 
    public string AreaName { get; set; } 

    public virtual ICollection<Child> Children{get;set;} 
} 

public class School 
{ 
    public int SchoolID { get; set; } 
    public string SchoolName{get;set;} 

    public virtual ICollection<Child> Children { get; set; } 
} 
public class GradeLevel 
{ 
    public int GradeLevelID{get;set;} 
    public string GradeLevelName { get; set; } 

    public virtual ICollection<Child> Children { get; set; } 
} 


public class ChildDbContext : DbContext 
{ 
    public DbSet<Child> Children { get; set; } 
    public DbSet<SchoolLevel> SchoolLevels { get; set; } 
    public DbSet<SchoolYear> SchoolYears { get; set; } 
    public DbSet<Area> Areas { get; set; } 
    public DbSet<School> Schools { get; set; } 
    public DbSet<GradeLevel> GradeLevels { get; set; } 
    public DbSet<Guardian> Guardians { get; set; } 
} 

Answer 1

您可以使用這種方法：創建一個History模型。這包含1個變化，如o log。

public class History 
{ 
    public int HistoryId { get; set; } 

    public int ModelType { get; set; } //it is ModelTypeEnum value. 
    public int ModelId { get; set; } 
    public string PropertyName { get; set; } 
    public string Propertyvalue {get;set;} 
    public DateTime ChangeDate { get; set; } 

    public int ChangedUserId { get; set; } 
} 

而且枚舉：

public enum ModelTypeEnum 
{ 
    Child =1, 
    SchoolLevel = 2, 
    //etc.. 
}; 

例如，當你編輯1個Child實體，給改變的屬性名稱和值，它的id，類型和其他人（CHANGEDATE，ChangedUserId），以History和保存歷史記錄。如果3個屬性會改變，你應該保存3個歷史實體。然後，您可以通過ModelId加載（過濾）歷史記錄，通過ChangedUserId等。