我的程序正在解析xml文件并将此文件中的订单添加到mssql数据库。在将这些订单添加到数据库之前，如果有任何需要处理的重复项，他会对它们进行分析。
foreach (var newOrderXml in newOrdersList)
{
var dupesInDb = _context.OrdersXml.Include(o=>o.OrderXmlItems)
.Where(o => o.OrX_ORDERNR.Contains(newOrderXml.OrX_ORDERNR))
.ToList();
_context.SaveChanges();
}
程序循环遍历newOrderList中的所有新订单，并使用linq查询获取重复列表。如果有0个重复项并且没有返回任何内容，则一切正常，但如果返回单个副本，则SaveChanges方法将抛出异常＆＃34;违反PRIMARY KEY约束PK_dbo.SewingCardBundles，无法在对象中插入重复键＆＃39 ; dbo.SewingCardBundles＆＃39 ;.重复的键值是（1）。＆＃34;，即使我没有在上下文中添加或修改任何内容。我真的不知道发生了什么，我正在做的就是得到，我不改变任何东西，我不创造新的对象。这个异常恰好发生在这个位置，如果我尝试在此linq查询之前保存更改，那么没有什么不好的事情发生，但如果我在这个linq查询后尝试它我得到例外。那么这些对环境的变化来自哪里呢？
以下是我的模特：
public class OrderXml
{
public OrderXml()
{
OrderXmlItems = new List<OrderXmlItem>();
}
public int OrX_Id { get; set; }
public string OrX_ORDERNR { get; set; }
public string OrX_REFERGB { get; set; }
public int? OrX_CUSTOMERNUM { get; set; }
public string OrX_DNAME { get; set; }
public string OrX_DADR { get; set; }
public string OrX_DPCODE { get; set; }
public string OrX_POSTALCODE { get; set; }
public string OrX_COUNTRY { get; set; }
public string OrX_PHONE { get; set; }
public string OrX_EMAIL { get; set; }
public int? OrX_LANG { get; set; }
public int? OrX_CUSTGRP { get; set; }
public int? OrX_QUALITCON { get; set; }
public string OrX_SHIPVIA { get; set; }
public string OrX_DATE1 { get; set; }
public string OrX_DATE2 { get; set; }
public string OrX_DELIVGB { get; set; }
public string OrX_SORT { get; set; }
public int? OrX_CURLAB { get; set; }
public List<OrderXmlItem> OrderXmlItems { get; set; }
public Adress Adress { get; set; }
}
public OrderXmlItem()
{
SewingCardBundle = new SewingCardBundle();
}
public int OxI_Id { get; set; }
public int? OxI_PRODUCT { get; set; }
public int? OxI_ORDERLINE { get; set; }
public int? OxI_QUANTITY { get; set; }
public int? OxI_TYPE { get; set; }
public string OxI_TPFABNR { get; set; }
public string OxI_TPFABDEF { get; set; }
public string OxI_TPFABNAME { get; set; }
public int? OxI_CURDIR { get; set; }
public int? OxI_CURWIDTH { get; set; }
public int? OxI_CURHEIGHT { get; set; }
public int? OxI_WORKMETH { get; set; }
public int? OxI_FOLDTYPE { get; set; }
public decimal? OxI_FOLDFACT { get; set; }
public int? OxI_CURBAND { get; set; }
public int? OxI_CURHEAD { get; set; }
public int? OxI_CURBOTSEAM { get; set; }
public int? OxI_PACKWLEFT { get; set; }
public int? OxI_PACKWRIGHT { get; set; }
public decimal? OxI_NRSTROL { get; set; }
public decimal? OxI_NRSTROR { get; set; }
public int? OxI_LINTYP { get; set; }
public string OxI_LINCOL { get; set; }
public int? OxI_EMBSORT { get; set; }
public int? OxI_EXTRA { get; set; }
public int? OxI_PRODUCE { get; set; }
public int? OxI_PACKSORT { get; set; }
public int? OxI_CURMODEL { get; set; }
public string OxI_BARCODE { get; set; }
public string OxI_EXTRAINF { get; set; }
public int? OxI_RAILTYP { get; set; }
public int? OxI_RAILCONT { get; set; }
public int? OxI_RAILCONTSIDE { get; set; }
public decimal? OxI_FABSTROTOT { get; set; }
public decimal? OxI_FABSTROLEFT { get; set; }
public decimal? OxI_FABSTRORIGHT { get; set; }
public int? OxI_FABUNDSIZ { get; set; }
public int? OxI_FABTOTSIZ { get; set; }
public int? OxI_LINSTROTOT { get; set; }
public int? OxI_LINUNDSIZ { get; set; }
public int? OxI_LINTOTSIZ { get; set; }
public decimal? OxI_FABWIDTH { get; set; }
public int? OxI_CHILDSFT { get; set; }
public int? OxI_FOLDSORT { get; set; }
public int? OxI_EMBLENGTH { get; set; }
public int? OxI_PACKMETH { get; set; }
public int OrderXmlId { get; set; }
public OrderXml OrderXml { get; set; }
public SewingCardBundle SewingCardBundle { get; set; }
}
public class SewingCardBundle
{
public SewingCardBundle()
{
FlamanSewingCards = new List<FlamandzkaSewingCard>();
FlamandzkaBrytaSewingCards = new List<FlamandzkaBrytaSewingCard>();
OczkaSewingCards = new List<OczkaSewingCard>();
OczkaBrytaSewingCards = new List<OczkaBrytaSewingCard>();
WellenbandSewingCards = new List<WellenbandSewingCard>();
WellenbandBrytaSewingCards = new List<WellenbandBrytaSewingCard>();
PodwiazkaSewingCards = new List<PodwiazkaSewingCard>();
TunelSewingCards = new List<TunelSewingCard>();
}
public int SwC_Id { get; set; }
public OrderXmlItem OrderXmlItem { get; set; }
public List<FlamandzkaSewingCard> FlamanSewingCards { get; set; }
public List<FlamandzkaBrytaSewingCard> FlamandzkaBrytaSewingCards { get; set; }
public List<OczkaSewingCard> OczkaSewingCards { get; set; }
public List<OczkaBrytaSewingCard> OczkaBrytaSewingCards { get; set; }
public List<WellenbandSewingCard> WellenbandSewingCards { get; set; }
public List<WellenbandBrytaSewingCard> WellenbandBrytaSewingCards { get; set; }
public List<PodwiazkaSewingCard> PodwiazkaSewingCards { get; set; }
public List<TunelSewingCard> TunelSewingCards { get; set; }
}
以及这些模型的Fluent API配置：
public class OrderXmlConfiguration : EntityTypeConfiguration<OrderXml>
{
public OrderXmlConfiguration()
{
HasKey(o => o.OrX_Id);
Property(o => o.OrX_ORDERNR).IsRequired();
Property(o => o.OrX_REFERGB).IsRequired();
Property(o => o.OrX_CUSTOMERNUM).IsRequired();
Property(o => o.OrX_DNAME).IsRequired();
Property(o => o.OrX_DPCODE).IsRequired();
Property(o => o.OrX_POSTALCODE).IsRequired();
Property(o => o.OrX_COUNTRY).IsRequired();
Property(o => o.OrX_LANG).IsRequired();
Property(o => o.OrX_CUSTGRP).IsRequired();
Property(o => o.OrX_SHIPVIA).IsRequired();
Property(o => o.OrX_CURLAB).IsRequired();
HasMany(i => i.OrderXmlItems)
.WithRequired(o => o.OrderXml)
.HasForeignKey(o => o.OrderXmlId)
.WillCascadeOnDelete(true);
}
}
public class OrderXmlItemConfiguration : EntityTypeConfiguration<OrderXmlItem>
{
public OrderXmlItemConfiguration()
{
HasKey(o => o.OxI_Id);
Property(p => p.OxI_Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
Property(p => p.OxI_PRODUCT).IsRequired();
Property(p => p.OxI_ORDERLINE).IsRequired();
Property(p => p.OxI_QUANTITY).IsRequired();
Property(p => p.OxI_TYPE).IsRequired();
Property(p => p.OxI_CURDIR).IsRequired();
Property(p => p.OxI_CURWIDTH).IsRequired();
Property(p => p.OxI_CURHEIGHT).IsRequired();
Property(p => p.OxI_WORKMETH).IsRequired();
Property(p => p.OxI_FOLDTYPE).IsRequired();
Property(p => p.OxI_FOLDFACT).IsRequired();
Property(p => p.OxI_PACKWLEFT).IsRequired();
Property(p => p.OxI_PACKWRIGHT).IsRequired();
Property(p => p.OxI_BARCODE).IsRequired();
HasRequired(i => i.SewingCardBundle)
.WithRequiredPrincipal( s=> s.OrderXmlItem)
.WillCascadeOnDelete(true);
}
}
public class SewingCardBundleConfiguration : EntityTypeConfiguration<SewingCardBundle>
{
public SewingCardBundleConfiguration()
{
HasKey(s => s.SwC_Id);
HasMany(s=>s.FlamanSewingCards)
.WithRequired(c=>c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.FlamandzkaBrytaSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.OczkaBrytaSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.OczkaSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.WellenbandSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.WellenbandBrytaSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.TunelSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
HasMany(s => s.PodwiazkaSewingCards)
.WithRequired(c => c.SewingCardBundle)
.WillCascadeOnDelete(true);
}
}
答案 0 :(得分：1)
我不确定你为什么要首先调用SaveChanges（不需要），但是一旦从数据库获取数据，上下文就会跟踪它们（即缓存它们）。
由于您未在查询中指定AsNoTracking，SaveChanges方法将尝试保存正在跟踪的实体，这将导致您的“主要密钥违规”异常。
要解决此问题，您只需指定AsNoTracking：
var dupesInDb = _context
.OrdersXml.Include(o=>o.OrderXmlItems)
.Where(o => o.OrX_ORDERNR.Contains(newOrderXml.OrX_ORDERNR))
.AsNoTracking()
.ToList();