Question

编程新手，新的stackoverflow，如果这不是一个合适的问题，请道歉。我收到一条错误消息，我对我的程序有什么问题感到傻眼。

基本上，每当我尝试调用视图时，都会收到标题中描述的错误。我的程序失败的一些例子：

Line 22:         public ActionResult Index()
Line 23:         {
**Line 24:             return View(db.hostSystems.ToList());**
Line 25:         }
Line 26:

以下是另一个例子：

Line 20:         public ActionResult Index()
Line 21:         {
**Line 22:             var hostDocuments = db.hostDocuments.Include(b => b.hostSystem);**
Line 23:             return View(hostDocuments.ToList());
Line 24:         }

每个视图都会发生这种情况。我曾尝试过搭建一个新教师，但同样，但是在任何生成的视图上都会出现错误。

当我尝试在Package Management控制台上运行update-database时，我也遇到了同样的错误：

PM> update-database -Force
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Applying explicit migrations: [201610121010400_InitialCreate, 201610141128247_NewFields, 201610141215392_changes, 201610141223280_changes2].
Applying explicit migration: 201610121010400_InitialCreate.
System.Xml.XmlException: Syntax for an XML declaration is invalid. Line 1, position 21.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
   at System.Xml.XmlTextReaderImpl.ParseXmlDeclaration(Boolean isTextDecl)
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XDocument.Load(Stream stream, LoadOptions options)
   at System.Data.Entity.Migrations.Edm.ModelCompressor.Decompress(Byte[] bytes)
   at System.Data.Entity.Migrations.DbMigration.GetModel(Func`2 modelAccessor)
   at System.Data.Entity.Migrations.DbMigration.GetTargetModel()
   at System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
   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)
Syntax for an XML declaration is invalid. Line 1, position 21.

昨天一切正常。我今天进来并开始使用我的机器，从那时起就遇到了这个问题。我绝对不知道自己出了什么问题，只是不明白为什么现在这样。检查了许多其他没有帮助的线程。

感谢您的帮助。

Answer 1

最终，这是由于迁移已损坏。我仍在调查这个问题，但它已经解决了。

全部谢谢

EntityFramework.dll中出现“System.Xml.XmlException”类型的异常，但未在用户代码

1 个答案: