Entity framework Upstate Database命令期间出现重复记录问题

这个问题涉及：

然而，我有一个不同的问题。我将重复字段添加到单独的记录中，如以下代码所示：

context.UnitOfMeasureDefaultBaseUnits.AddOrUpdate(x => x.Name,
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Pound", Active = true, Abbreviation = "lb", DisplayOrder = 1, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Ounce", Active = true, Abbreviation = "oz", DisplayOrder = 2, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Ton", Active = true, Abbreviation = "ton", DisplayOrder = 3, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Gram", Active = true, Abbreviation = "g", DisplayOrder = 4, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Kilogram", Active = true, Abbreviation = "kg", DisplayOrder = 5, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Metric Ton", Active = true, Abbreviation = "t", DisplayOrder = 6, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Other", Active = true, Abbreviation = "", DisplayOrder = 7, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Hour", Active = true, Abbreviation = "hr", DisplayOrder = 1, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Minute", Active = true, Abbreviation = "min", DisplayOrder = 2, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Day", Active = true, Abbreviation = "day", DisplayOrder = 3, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Work Day", Active = true, Abbreviation = "wrkday", DisplayOrder = 4, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Other", Active = true, Abbreviation = "", DisplayOrder = 5, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Gallon", Active = true, Abbreviation = "gal", DisplayOrder = 1, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Fluid Ounce", Active = true, Abbreviation = "floz", DisplayOrder = 2, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Quart", Active = true, Abbreviation = "qt", DisplayOrder = 3, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Liter", Active = true, Abbreviation = "l", DisplayOrder = 4, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Cubic Inch", Active = true, Abbreviation = "cuin", DisplayOrder = 5, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Cubic Centimeter", Active = true, Abbreviation = "cucm", DisplayOrder = 6, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Other", Active = true, Abbreviation = "", DisplayOrder = 7, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Volume")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Foot", Active = true, Abbreviation = "ft", DisplayOrder = 1, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Inch", Active = true, Abbreviation = "in", DisplayOrder = 2, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Yard", Active = true, Abbreviation = "yd", DisplayOrder = 3, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Mile", Active = true, Abbreviation = "mi", DisplayOrder = 4, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Millimeter", Active = true, Abbreviation = "mm", DisplayOrder = 5, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Meter", Active = true, Abbreviation = "m", DisplayOrder = 6, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Other", Active = true, Abbreviation = "", DisplayOrder = 7, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Length")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Square Foot", Active = true, Abbreviation = "sqft", DisplayOrder = 1, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Area")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Square Inch", Active = true, Abbreviation = "sqin", DisplayOrder = 2, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Area")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Square Yard", Active = true, Abbreviation = "sqyd", DisplayOrder = 3, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Area")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Square Meter", Active = true, Abbreviation = "sqm", DisplayOrder = 4, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Area")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Other", Active = true, Abbreviation = "", DisplayOrder = 5, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Area")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Each", Active = true, Abbreviation = "ea", DisplayOrder = 1, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Count")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Pair", Active = true, Abbreviation = "pr", DisplayOrder = 2, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Count")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Dozen", Active = true, Abbreviation = "dz", DisplayOrder = 3, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Count")).RecordID },
    new UnitOfMeasureDefaultBaseUnitsModel() { Name = "Other", Active = true, Abbreviation = "", DisplayOrder = 4, UnitOfMeasureTypeID = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Count")).RecordID }
);

updatedatabase

命令正在发出，因为“Other”被多次使用，并出现以下错误：

System.InvalidOperationException: Sequence contains more than one element
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__2[TResult](IEnumerable`1 sequence)
   at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot)
   at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[TResult](Expression expression)
   at System.Data.Entity.Internal.Linq.DbQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.SingleOrDefault[TSource](IQueryable`1 source, Expression`1 predicate)
   at System.Data.Entity.Migrations.DbSetMigrationsExtensions.AddOrUpdate[TEntity](DbSet`1 set, IEnumerable`1 identifyingProperties, InternalSet`1 internalSet, TEntity[] entities)
   at System.Data.Entity.Migrations.DbSetMigrationsExtensions.AddOrUpdate[TEntity](IDbSet`1 set, Expression`1 identifierExpression, TEntity[] entities)
   at Model.Migrations.Configuration.Seed(ApplicationDbContext context) in Z:\_Profile Storage\Projects\Corporate.Web.MVCAPI\Corporate.Web.MVCAPI\Model\Migrations\Configuration.cs:line 6744
   at System.Data.Entity.Migrations.DbMigrationsConfiguration`1.OnSeed(DbContext context)
   at System.Data.Entity.Migrations.DbMigrator.SeedDatabase()
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.SeedDatabase()
   at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
   at System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String targetMigration)
   at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClassc.<Update>b__b()
   at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
   at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
   at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.Run()
   at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
   at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
   at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
   at System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration, Boolean force)
   at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
   at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Sequence contains more than one element

System.InvalidOperationException:序列包含多个元素
在System.Linq.Enumerable.SingleOrDefault[TSource]（IEnumerable`1 source）处
位于System.Data.Entity.Core.Objects.elink.ObjectQueryProvider.b__2[TResult]（IEnumerable`1序列）
位于System.Data.Entity.Core.Objects.Elink.ObjectQueryProvider.ExecuteSingle[TResult]（IEnumerable`1查询，表达式queryRoot）
位于System.Data.Entity.Core.Objects.Elink.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[TResult]（表达式）
在System.Data.Entity.Internal.Linq.DbQueryProvider.Execute[TResult]（表达式）处
位于System.Linq.Queryable.SingleOrDefault[TSource]（IQueryable`1源，表达式`1谓词）
位于System.Data.Entity.Migrations.DbSetMigrationsExtensions.AddOrUpdate[TEntity]（DbSet`1集合，IEnumerable`1识别属性，InternalSet`1 InternalSet，TEntity[]实体）
位于System.Data.Entity.Migrations.DbSetMigrationsExtensions.AddOrUpdate[TEntity]（IDbSet`1集，表达式`1 identifierExpression，TEntity[]entities）
在Z:\\ u Profile Storage\Projects\Corporate.Web.MVCAPI\Corporate.Web.MVCAPI\Model\Migrations\Configuration.cs中的Model.Migrations.Configuration.Seed（ApplicationDbContext上下文）处：第6744行
在System.Data.Entity.Migrations.DbMigrationsConfiguration`1.OnSeed（DbContext上下文）中
位于System.Data.Entity.Migrations.DbMigrator.SeedDatabase（）处
位于System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.SeedDatabase（）处
位于System.Data.Entity.Migrations.DbMigrator.Upgrade（IEnumerable`1 pendingMigrations，String targetMigrationId，String lastMigrationId）
位于System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade（IEnumerable`1 pendingMigrations，字符串targetMigrationId，字符串lastMigrationId）
位于System.Data.Entity.Migrations.Dbmigator.UpdateInternal（字符串targetMigration）
在System.Data.Entity.Migrations.DbMigrator.c__DisplayClassc.b__b（）中
位于System.Data.Entity.Migrations.Dbmigator.EnsureDatabaseExists（操作必须成功才能访问数据库）
位于System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists（操作必须成功才能使用数据库）
位于System.Data.Entity.Migrations.DbMigrator.Update（字符串targetMigration）
位于System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update（字符串targetMigration）
在System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.Run（）中
在System.AppDomain.DoCallBack（CrossAppDomainDelegate callBackDelegate）处
在System.AppDomain.DoCallBack（CrossAppDomainDelegate callBackDelegate）处
位于System.Data.Entity.Migrations.Design.ToolingFacade.Run（BaseRunner）
位于System.Data.Entity.Migrations.Design.ToolingFacade.Update（字符串targetMigration，布尔力）
在System.Data.Entity.Migrations.UpdateDatabaseCommand.c__DisplayClass2.b__0（）中
位于System.Data.Entity.Migrations.MigrationsDomainCommand.Execute（操作命令）
序列包含多个元素

---

是否有解决此问题的方法？它是什么？

第一个参数告诉addor更新密钥。您正在使用名称，因此其他名称不能被多次使用。把它换成独一无二的东西。也许x=>x.UnitOfMeasureTypeID？否则，请放弃AddOrUpdate语法并使用常规LINQ：

var weightUnitTypeId = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID;

if (!context.UnitOfMeasureDefaultBaseUnits.Any(u => u.UnitOfMeasureTypeID == weightUnitTypeId && u.Name == "Pound"))
{
     // insert new record
     var pound = new UnitOfMeasureDefaultBaseUnitsModel { Name = "Pound", Active = true, Abbreviation = "lb", DisplayOrder = 1, UnitOfMeasureTypeID = weightUnitTypeId };
     context.UnitOfMeasureDefaultBaseUnits.Add(pound);
}
// repeat for Ounce, Ton, etc.


var timeUnitTypeId = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID;

if (!context.UnitOfMeasureDefaultBaseUnits.Any(u => u.UnitOfMeasureTypeID == timeUnitTypeId && u.Name == "hr"))
{
     // insert new record
     var time = new UnitOfMeasureDefaultBaseUnitsModel { Name = "hr", Active = true, Abbreviation = "hr", DisplayOrder = 1, UnitOfMeasureTypeID = weightUnitTypeId };
     context.UnitOfMeasureDefaultBaseUnits.Add(time);
}
// repeat for all time units

...
// similar for other units
...
context.SaveChanges();

---

第一个参数告诉addor更新密钥。您正在使用名称，因此其他名称不能被多次使用。把它换成独一无二的东西。也许x=>x.UnitOfMeasureTypeID？否则，请放弃AddOrUpdate语法并使用常规LINQ：

var weightUnitTypeId = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Weight")).RecordID;

if (!context.UnitOfMeasureDefaultBaseUnits.Any(u => u.UnitOfMeasureTypeID == weightUnitTypeId && u.Name == "Pound"))
{
     // insert new record
     var pound = new UnitOfMeasureDefaultBaseUnitsModel { Name = "Pound", Active = true, Abbreviation = "lb", DisplayOrder = 1, UnitOfMeasureTypeID = weightUnitTypeId };
     context.UnitOfMeasureDefaultBaseUnits.Add(pound);
}
// repeat for Ounce, Ton, etc.


var timeUnitTypeId = context.UnitOfMeasureDefaultType.FirstOrDefault(r => r.Name.Equals("Time")).RecordID;

if (!context.UnitOfMeasureDefaultBaseUnits.Any(u => u.UnitOfMeasureTypeID == timeUnitTypeId && u.Name == "hr"))
{
     // insert new record
     var time = new UnitOfMeasureDefaultBaseUnitsModel { Name = "hr", Active = true, Abbreviation = "hr", DisplayOrder = 1, UnitOfMeasureTypeID = weightUnitTypeId };
     context.UnitOfMeasureDefaultBaseUnits.Add(time);
}
// repeat for all time units

...
// similar for other units
...
context.SaveChanges();

---

有没有办法检查两个键而不是一个键？是的，x=>new{x.part1，x.part2}现在我得到了这个

没有为类型'System.Nullable'1[System.Guid]”和'System.Guid'定义二进制运算符Equal。

我想我必须对这部分种子进行老式的LINQ。这是否有效：

如果（！context.UnitOfMeasureDefaultBaseUnits.Any（u=>u.UnitOfMeasureTypeID.Equals（context.UnitOfMeasureDefaultType.FirstOrDefault（r=>r.Name.Equals（“Weight”）.RecordID））&&！context.UnitOfMeasureDefaultBaseUnits.Any（u=>u.Name.Equals（“Pound”））{新的度量单位DefaultBaseUnitsModel（）{=”Name=“Pound”，Active=true，缩写=“lb”，DisplayOrder=1，UnitOfMeasureTypeID=context.UnitOfMeasureDefaultType.FirstOrDefault（r=>r.Name.Equals（“Weight”））.RecordID}；}

我编辑了答案。它可能更精简，但你会明白（希望如此）。有没有办法检查两个键而不是一个键？是的，x=>new{x.part1，x.part2}现在我得到了这个

没有为类型'System.Nullable'1[System.Guid]和'System.Guid'定义二进制运算符Equal。

我想我必须为这部分种子处理执行老式的LINQ。这是否有效：

如果（！context.UnitOfMeasureDefaultBaseUnits.Any（u=>u.UnitOfMeasureTypeID.Equals（context.UnitOfMeasureDefaultType.FirstOrDefault（r=>r.Name.Equals（“Weight”））.RecordID））&！context.UnitOfMeasureDefaultBaseUnits.Any（u=>u.Name.Equals（“Pound”）{new UnitOfMeasureDefaultBaseUnitsModel（）{Name=“Pound”，Active=true，缩写=“lb”，DisplayOrder=1，UnitOfMeasureTypeID=context.UnitOfMeasureDefaultType.FirstOrDefault（r=>r.Name.Equals（“Weight”）.RecordID}；}

我编辑了答案。它可能会更精简，但你会明白（希望如此）。