EF 一個實體對象不能由多個 IEntityChangeTracker 實例引用 解決辦法

在DAL層中，建立工廠類 public static class SysDbContextFactory { ///

/// 從Http上下文中獲取EF容器 ///

/// public static SysDbContext GetSysDbContext() { var context = HttpContext.Current.Items[nameof(SysDbContext)] as SysDbContext; if (context == null) { context = new SysDbContext(); HttpContext.Current.Items[nameof(SysDbContext)] = context; } return context as SysDbContext; } } 然後在DAL 傳入 public class ProductTypeService:EntityHelper, IProductTypeService { public ProductTypeService() : base(SysDbContextFactory.GetSysDbContext()) // 這裏 {} public ProductTypeService(SysDbContext sysDbContext) : base(sysDbContext) { } }