C# · 12月 22, 2021

命名空间中不存在c# – 类型或命名空间名称

我有一个.cs文件中的代码,我遇到下面的错误,任何帮助将不胜感激. using System.Data.Entity;namespace Assignment2.Models{ public class TicketBookingEntities : DbContext { public DbSet<Performance> Performances { get; set; } public DbSet<Production> Productions { get; set; } }}

错误:

Error 1 The type or namespace name ‘Entity’ does not exist in the namespace ‘System.Data’ (are you missing an assembly reference?)Error 2 The type or namespace name ‘DbContext’ Could not be found (are you missing a using directive or an assembly reference?)Error 3 The type or namespace name ‘DbSet’ Could not be found (are you missing a using directive or an assembly reference?)Error 4 The type or namespace name ‘DbSet’ Could not be found (are you missing a using directive or an assembly reference?)解决方法 确保您的项目包含对EntityFramework.dll的引用.
请参阅如果您不知道如何添加引用,请在 this link中添加Visual C#中的引用.