c# - Entity Framework 返回数据库中不存在的实体

Question

我在使用 EF6 时遇到了一个非常奇怪的行为。我有一个插入失败的实体，但是当我枚举实体时，在那之后的第一次，我检索了该实体

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
    }
}

Entity Framework 电动工具生成的类别实体

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

我解决了我的问题。我的实体和 DBContext 是使用“ Entity Framework 强大工具，逆向工程代码优先”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来重新生成实体和 dbcontext，现在可以使用相同的代码。