Upstate-Database 命令期间的重复记录问题

Question

这个问题是关于：

Sequence contains more than one element error in EF CF Migrations

但是我有一个不同的问题。我将重复的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 }
);

Update-Database 命令正在呕吐，因为多次使用 "Other" 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

这个问题有解决方法吗？那是什么？

Answer 1

第一个参数告诉AddOrUpdate 键。您正在使用 Name，因此 Other 不能多次使用。将其切换为独特的东西。也许 x => x.UnitOfMeasureTypeID ？否则放弃 AddOrUpdate 语法并使用传统的 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();

Upstate-Database 命令期间的重复记录问题

Duplicate Record issues during Upstate-Database command

entity-framework

ef-code-first

c#-4.0

entity-framework-migrations