实体框架返回数据库中不存在的实体

Question

我在EF6中遇到了一个非常奇怪的行为。我有插入失败的实体，但是当我列举的实体，在第一时间之后，我检索由实体框架电动工具

public partial class Category 
{ 
    public Category() 
    { 
     this.Products = new List<Product>();    
     this.TranslationCategories = new List<TranslationCategory>(); 
    } 

    public int CategoryId { get; set; } 
    public Nullable<int> ParentCategoryId { get; set; } 
    public string Reference { get; set; } 
    public System.DateTime CreationDate { get; set; } 
    public string Name { get; set; } 
    public Nullable<bool> Published { get; set; } 
    public string Artwork { get; set; } 
    public string TypeCode { get; set; } 
    public virtual ICollection<Product> Products { get; set; }   
    public virtual ICollection<TranslationCategory> TranslationCategories {get;set; } 
} 

Answer 1

我解决产生

static async Task Debug() 
{ 
    MyDbContext ctx = new MyDbContext(); 
    Category category = new Category() 
    {    
     Name = "TEST INSERTION FAILED", 
     Reference = "KKK", 
     TranslationCategories = new List<TranslationCategory>() 
     { 
      new TranslationCategory() 
      {       
       //LangId = "FR", Force insertion failed 
       Name= "FR translation" 
      } 
     } 
    }; 
    try 
    { 
     ctx.Categories.Add(category); 
     await ctx.SaveChangesAsync(); 
    } 
    catch(Exception ex) 
    { 
     Console.WriteLine(ex.Message); 
     // throw exception because "LangId" missing in Translation Category 
    } 
    MyDbContext ctx2 = new MyDbContext(); 
    foreach(var o in ctx2.Categories.ToList()) 
    { 
     Console.WriteLine(o.Name); 
     //output : "TEST INSERTION FAILED" + categories stored in DB 
     // Why category "TEST INSERTION FAILED" in ctx2.Categories ? 
    } 
    Console.WriteLine("****************"); 
    foreach (var o in ctx2.Categories.ToList()) 
    { 
     Console.WriteLine(o.Name); 
     // ouput : only categories stored in DB 
    } 
} 

类别实体的实体我问题。我的实体和DBContext是使用“实体框架电源工具，首先反向工程代码”生成的。 我通过添加Ado.net数据实体模型，现有数据库中的代码优先，现在具有相同的代码，从而生成了重新生成的实体和dbcontext。