【发布时间】：2016-02-16 07:28:05
【问题描述】：
我正在 Umbraco 7 中构建一个站点。我在 7.3.x 上，现在更新到 7.4.0。网站偶尔会崩溃，我会收到以下消息。
[ArgumentException: An entry with the same key already exists.]
System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +52
System.Collections.Generic.SortedList`2.Add(TKey key, TValue value) +6744873
Umbraco.Core.MainDom.Register(Action install, Action release, Int32 weight) +128
Umbraco.Core.Sync.DatabaseServerMessenger.Boot() +55
Umbraco.Web.BatchedDatabaseServerMessenger.Startup() +186
Umbraco.Web.BatchedDatabaseServerMessengerStartup.ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext) +63
Umbraco.Core.ApplicationEventHandler.OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext) +37
Umbraco.Core.CoreBootManager.<Complete>b__a(IApplicationEventHandler x) +230
Umbraco.Core.EnumerableExtensions.ForEach(IEnumerable`1 items, Action`1 action) +141
Umbraco.Core.CoreBootManager.Complete(Action`1 afterComplete) +293
Umbraco.Web.WebBootManager.Complete(Action`1 afterComplete) +60
Umbraco.Core.UmbracoApplicationBase.StartApplication(Object sender, EventArgs e) +234
Umbraco.Core.UmbracoApplicationBase.Application_Start(Object sender, EventArgs e) +34
我已经缩小了问题的范围，它与检查索引有关。在开发环境中我只需要重新构建它就可以正常工作，但在测试中我们需要停止应用程序池删除检查索引并重新启动。
我也从日志中得到这个
2016-02-16 08:12:50,006 [P4656/D62/T1] INFO Umbraco.Core.DatabaseContext - CanConnect = True
2016-02-16 08:12:50,051 [P4656/D62/T1] INFO Umbraco.Core.DatabaseContext - CanConnect = True
2016-02-16 08:12:50,051 [P4656/D62/T1] INFO Umbraco.Core.DatabaseContext - CanConnect = True
2016-02-16 08:12:50,072 [P4656/D62/T1] INFO Umbraco.Core.DatabaseContext - CanConnect = True
2016-02-16 08:12:50,072 [P4656/D62/T1] ERROR Umbraco.Core.CoreBootManager - An error occurred running OnApplicationStarted for handler Umbraco.Web.BatchedDatabaseServerMessengerStartup
System.ArgumentException: An entry with the same key already exists.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.SortedList`2.Add(TKey key, TValue value)
at Umbraco.Core.MainDom.Register(Action install, Action release, Int32 weight)
at Umbraco.Core.Sync.DatabaseServerMessenger.Boot()
at Umbraco.Web.BatchedDatabaseServerMessenger.Startup()
at Umbraco.Web.BatchedDatabaseServerMessengerStartup.ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
at Umbraco.Core.ApplicationEventHandler.OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
at Umbraco.Core.CoreBootManager.<Complete>b__a(IApplicationEventHandler x)
2016-02-16 08:12:50,074 [P4656/D62/T1] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
System.ArgumentException: An entry with the same key already exists.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.SortedList`2.Add(TKey key, TValue value)
at Umbraco.Core.MainDom.Register(Action install, Action release, Int32 weight)
at Umbraco.Core.Sync.DatabaseServerMessenger.Boot()
at Umbraco.Web.BatchedDatabaseServerMessenger.Startup()
at Umbraco.Web.BatchedDatabaseServerMessengerStartup.ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
at Umbraco.Core.ApplicationEventHandler.OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
at Umbraco.Core.CoreBootManager.<Complete>b__a(IApplicationEventHandler x)
at Umbraco.Core.EnumerableExtensions.ForEach[TItem](IEnumerable`1 items, Action`1 action)
at Umbraco.Core.CoreBootManager.Complete(Action`1 afterComplete)
at Umbraco.Web.WebBootManager.Complete(Action`1 afterComplete)
at Umbraco.Core.UmbracoApplicationBase.StartApplication(Object sender, EventArgs e)
at Umbraco.Core.UmbracoApplicationBase.Application_Start(Object sender, EventArgs e)
我读到这可能与重复的用户有关，但数据库中不存在这样的东西。
另一个可能导致此问题的问题是开发站点和测试站点共享同一个 Umbraco 数据库。我不确定这是否会导致这种冲突。
无论如何，我对这个错误感到非常困惑，任何帮助都将受到高度赞赏，因为它非常重要。
提前致谢，瓦西利斯
【问题讨论】：