實體框架返回數據庫中不存在的實體

Question

我在EF6中遇到了一個非常奇怪的行爲。我有插入失敗的實體，但是當我列舉的實體，在第一時間之後，我檢索由實體框架電動工具

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

我解決產生

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 
    } 
} 

類別實體的實體我問題。我的實體和DBContext是使用「實體框架電源工具，首先反向工程代碼」生成的。 我通過添加Ado.net數據實體模型，現有數據庫中的代碼優先，現在具有相同的代碼，從而生成了重新生成的實體和dbcontext。