C# 如果ASP.NET 5应用程序在Ubuntu上运行，它能否与MS SQL Server通信？

我使用Visual Studio 2015中的新建应用程序向导“bitbucket上的代码”创建了一个新的ASP.NET 5 web应用程序。之后，我获得了在Ubuntu 14.04 LTS上运行的源代码，足以加载主静态html页面，而

DNXWeb

为我的应用程序提供服务。但是，如果我单击“注册”链接，并尝试将电子邮件和密码放入web UI端和dnx web端的“错误。处理您的请求时出错”，我会得到以下信息：

error   : [Microsoft.AspNet.Diagnostics.ExceptionHandlerMiddleware] 
An unhandled exception has occurred: Could not load file or assembly 
'System.Data.SqlClient, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. 
The system cannot find the file specified.
...
File name: 'System.Data.SqlClient'
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyName(AssemblyName assemblyName)
   at System.Runtime.Loader.AssemblyLoadContext.Resolve(IntPtr gchManagedAssemblyLoadContext, AssemblyName assemblyName)
   at Microsoft.Data.Entity.Storage.Internal.SqlServerConnection.CreateDbConnection()
   at Microsoft.Data.Entity.Internal.LazyRef`1.get_Value()
   at Microsoft.Data.Entity.Migrations.Internal.Migrator.Migrate(String targetMigration)
   at AspNetWebApplication.Controllers.AccountController.EnsureDatabaseCreated(ApplicationDbContext context)
   at AspNetWebApplication.Controllers.AccountController.<Register>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Mvc.Controllers.ControllerActionExecutor.<CastToObject>d__8`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Mvc.Controllers.ControllerActionInvoker.<InvokeActionAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Mvc.Controllers.FilterActionInvoker.<InvokeActionFilterAsync>d__50.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNet.Mvc.Controllers.FilterActionInvoker.<InvokeAsync>d__41.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Mvc.Infrastructure.MvcRouteHandler.<RouteAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Routing.Template.TemplateRoute.<RouteAsync>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Routing.RouteCollection.<RouteAsync>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNet.Diagnostics.ExceptionHandlerMiddleware.<Invoke>d__5.MoveNext()

我认为System.Data.SqlClient在其nuget软件包中没有提供任何

netcoreXX

或

DNXCoreXX

变体文件夹，因此该软件包实际上是不可移植的，尽管不会向用户发出任何警告。因此，类加载失败的原因很简单，就是NuGet有一个同名的包，但它不包含可由ubuntu上的coreclr x64找到并加载的变体文件夹。

11月19日更新 从现在起，如果您关闭了多个活动结果集，就可以在linux上使用coreclr的System.Data.SqlClient。请参阅上的发行说明。

---

运行linux的ASP.NET 5可以与MS MSQL通信，但可能不使用coreclr运行时

System.Data.SqlClient

仅标记为10月14日在中完成，而beta8于10月15日发布。我不确定它是否最终被包含在beta8中，但您发布的错误与beta7的错误相同，这让我相信该库仍然没有被包含。你的调查似乎也指出了这一点

如果是这种情况，那么在linux上运行它的唯一选项就是使用mono运行时（与beta7相同）。为此，请从project.json中删除

“dnxcore50”：{}

行，并告诉

dnvm

以mono而不是coreclr为目标。这还需要在linux机器上安装mono（我认为是4.1或更高版本）

---

如果您不想在机箱上安装mono，a也是一个选项。

我不希望它工作或尝试使用localdb，我希望它可以通过网络与Windows上的ms sql数据库通信。我相信它实际上不会工作。但它会尝试（通过实体框架的默认连接确定逻辑）尝试localdb的连接字符串，如果它在类加载时超过失败点，或者EF7的默认localdb行为必须是有条件的，有一点我会怀疑。我知道它可以在Windows上的dnxcore50上使用beta8，所以我希望它可以在Linux机器上通过网络与ms sql对话，但不能使用localdb，因为warren正在尝试，我很确定这就是Windowsonly@Joelocaldb（或与此相关的任何连接字符串）在这种情况下不相关，因为找不到System.Data.SqlClient。我刚刚运行了一个测试，发现尝试在dnxcore50上创建MSSQL连接可以在windows上运行，但是对于beta7和beta8，在linux上抛出与上面相同的异常。这很有趣，因为在Ubuntu14.04上，1.0.0-beta8中的mono运行时似乎完全崩溃，正如这个问题所述：@WarrenP看到我关于这个问题的答案似乎是dnxcore50 linux版本中的一个bug，希望它能在RC中修复

DNXCore50      MonoTouch10  netcore50     xamarinmac20
MonoAndroid10  net46        xamarinios10