VS Studio调试时“函数评估需所有线程运行”错误的解决求助

在Visual Studio调试过程中，遇到错误提示：the function evaluation requires all threads to run，截图如下：

项目采用EF Code First模式，相关代码如下：

控制器代码 #

public class ApplicationController : Controller
{
    ApplicationDbContext _context = new ApplicationDbContext();
    public ActionResult Index()
    {
        List<Brand> brands;
        brands = _context.Brands.ToList();
        return View(brands);
    }
}

DbContext代码 #

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext()
        : base("name=ApplicationDbContext")
    {
    }

    public virtual DbSet<Brand> Brands { get; set; }
    public virtual DbSet<Product> Products { get; set; }
}

Brand模型代码 #

public class Brand
{
    [Key]
    public int brand_id { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    public string brandname { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    public string program { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    public string currency { get; set; }

    public string note { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:dd-MM-yyyy}", ApplyFormatInEditMode = true)]
    public DateTime timestart { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    [DataType(DataType.Date)]
    [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd-MM-yyyy}")]
    public DateTime timeend { get; set; }
    public virtual List<Product> Products { get; set; } = new List<Product>();
}

Product模型代码 #

public class Product
{
    [Key]
    public int product_id { get; set; }
    [ForeignKey("Brand")]
    public int brand_id { get; set; }
    public virtual Brand Brand { get; private set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    public string productname { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    public string condition { get; set; }
    [Required(ErrorMessage = "Nhập thiếu kìa fen.")]
    [Column(TypeName = "numeric")]
    public decimal rebate { get; set; }

    public string note { get; set; }
}

• 禁用“仅我的代码”调试选项
  打开Visual Studio的工具 -> 选项 -> 调试 -> 常规，取消勾选启用“仅我的代码”，重启调试。该选项可能干扰EF实体的懒加载评估。

• 处理EF懒加载问题
  错误多因调试时访问未加载的关联实体触发，可二选一操作：

  1. 在DbContext构造函数中关闭懒加载：

     public ApplicationDbContext() : base("name=ApplicationDbContext")
     {
         this.Configuration.LazyLoadingEnabled = false;
     }
     

  2. 查询时提前加载关联数据：

     brands = _context.Brands.Include(b => b.Products).ToList();
     

• 调整调试器函数评估设置
  打开工具 -> 选项 -> 调试 -> 常规，取消勾选允许在调试期间对函数进行评估，避免调试器自动评估可能阻塞的EF实体属性。

• 排查线程阻塞
  通过调试 -> 窗口 -> 线程查看线程状态，确认是否有线程挂起或死锁，EF查询需要数据库连接线程正常运行，阻塞会触发该错误。

内容的提问来源于stack exchange，提问作者quanhprx