[英]Microsoft Entity Framework is not saving changes
我目前正在嘗試使用 dbfactory 和 microsoft EF 的泛型來實現 CRUD 功能,但是雖然列出條目正在工作,但對 db 的更改目前無法正常工作。
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; }
}
除了此處列出的功能之外,還有一些其他功能的 DBCore,這些功能與工廠無關
public class DBCore : DbContext
{
public static string connectionString = "myConnectionStringToDb";
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(connectionString);
}
調用工廠的數據服務
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);
}
}
簡單的 CRUD 工廠,
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");
}
}
}
編輯:按照建議我更改了代碼,因此它應該為工廠保存更改,其中還包含上下文作為屬性。 但它似乎仍然不適用於所有數據庫操作,除了列出所有條目
Editv2:感謝您的建議,我似乎已經解決了這個問題,但是出現了一個新問題:DI 現在可以執行數據庫操作,例如刪除條目,但是現在我無法再列出條目,因為出現以下錯誤,盡管那里的代碼並沒有真正實現改變:
“已執行‘GetAllOrders’(失敗,Id=5fb95793-572a-4545-ac15-76dffaa7a0cf,持續時間=74ms)[2020-10-23T14:33:43.711] System.Private.CoreLib:NewsoftOrders function 時執行異常Json:檢測到屬性“Context”的自引用循環,類型為“FicoTestApp.Models.SalesOrder”。路徑“[0].ChangeTracker”。”
嘗試添加
services.AddControllers().AddNewtonsoftJson(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);
給你的
啟動文件
它應該工作
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