[英]Microsoft Entity Framework is not saving changes
我目前正在尝试使用 dbfactory 和 microsoft EF 的泛型来实现 CRUD 功能,但是虽然列出条目正在工作,但对 db 的更改目前无法正常工作。
public class AbstractDataModel
{
[Key]
public Guid gid { get; set; }
}
模型
class SalesOrder : AbstractDataModel
{
public int salesOrderID { get; set; }
public int productID { get; set; }
public int customerID { get; set; }
public Guid createdBy { get; set; }
public string dateCreated { get; set; }
public string orderDate { get; set; }
public string orderStatus { get; set; }
public string dateModified { get; set; }
}
除了此处列出的功能之外,还有一些其他功能的 DBCore,这些功能与工厂无关
public class DBCore : DbContext
{
public static string connectionString = "myConnectionStringToDb";
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(connectionString);
}
调用工厂的数据服务
class SalesOrderService : DBCore
{
public DbSet<SalesOrder> SalesOrders { get; set; }
public OkObjectResult GetAllSalesOrders()
{
DBFactory factory = new DBFactory();
return new OkObjectResult(JsonConvert.SerializeObject(factory.GetAll(SalesOrders)));
}
public OkObjectResult AddSalesOrder(SalesOrder order)
{
order.gid = Guid.NewGuid();
return DBFactory.AddOne(order);
}
public OkObjectResult UpdateSalesOrder(SalesOrder order)
{
return DBFactory.UpdateOne(order);
}
public OkObjectResult DeleteSalesOrder(SalesOrder order)
{
return DBFactory.DeleteOne(order);
}
}
简单的 CRUD 工厂,
class DBFactory : DBCore
{
public DbSet<UserModel> Users { get; set; }
public DbSet<SalesOrder> SalesOrders { get; set; }
public List<T> GetAll<T>(DbSet<T> dbset) where T : class
{
using (this)
{
return dbset.ToList();
}
}
public static OkObjectResult AddOne<T>(T data)
{
using (DBFactory factory = new DBFactory())
{
factory.Add(data);
factory.SaveChanges();
return new OkObjectResult("Entry was sucessfully added");
}
}
public static OkObjectResult UpdateOne<T>(T data)
{
using (DBFactory factory = new DBFactory())
{
factory.Update(data);
factory.SaveChanges();
return new OkObjectResult("Entry was sucessfully updated");
}
}
public static OkObjectResult DeleteOne<T>(T data)
{
using (DBFactory factory = new DBFactory())
{
factory.Attach(data);
factory.Remove(data);
factory.SaveChanges();
return new OkObjectResult("Entry was sucessfully removed");
}
}
}
编辑:按照建议我更改了代码,因此它应该为工厂保存更改,其中还包含上下文作为属性。 但它似乎仍然不适用于所有数据库操作,除了列出所有条目
Editv2:感谢您的建议,我似乎已经解决了这个问题,但是出现了一个新问题:DI 现在可以执行数据库操作,例如删除条目,但是现在我无法再列出条目,因为出现以下错误,尽管那里的代码并没有真正实现改变:
“已执行‘GetAllOrders’(失败,Id=5fb95793-572a-4545-ac15-76dffaa7a0cf,持续时间=74ms)[2020-10-23T14:33:43.711] System.Private.CoreLib:NewsoftOrders function 时执行异常Json:检测到属性“Context”的自引用循环,类型为“FicoTestApp.Models.SalesOrder”。路径“[0].ChangeTracker”。”
尝试添加
services.AddControllers().AddNewtonsoftJson(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);
给你的
启动文件
它应该工作
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