ASP.NET Web API 在 raspberry pi 2 (ARM) 上运行时导致异常

Question

我最近使用 .NET Core 在 Ubuntu 中编写了一个 Web API，我需要使用数据库来存储应用程序数据，因此我决定使用 EF Core。我运行这个项目在 Ubuntu 机器上，一切正常。我也试过在我的 raspberry pi 2 上运行它，但我没有足够幸运让它正常工作。我在 this website 上执行了说明，并在通过 Remmina 远程桌面访问我的 RP 时尝试访问 Firefox 上的 api/dooz 时立即得到了这个输出。如果问题出在数据库上，我如何将 .db 文件包含到 iDooz_1/bin/Release/netcoreapp2.1/linux-arm/publish 文件夹中以使其正常工作？我该如何解决？

c343@RP:~/publish_idooz1$ ./iDooz_1 
Hosting environment: Production
Content root path: /home/c343/publish_idooz1
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.
warn: Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware[3]
      Failed to determine the https port for redirect.
fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLFUSJJ3S54N", Request id "0HLFUSJJ3S54N:00000001": An unhandled exception was thrown by the application.
Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 1: 'no such table: Players'.
   at Microsoft.Data.Sqlite.SqliteException.ThrowExceptionForRC(Int32 rc, sqlite3 db)
   at Microsoft.Data.Sqlite.SqliteCommand.PrepareAndEnumerateStatements(Stopwatch timer)+MoveNext()
   at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior)
   at Microsoft.Data.Sqlite.SqliteCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteReader(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.BufferlessMoveNext(DbContext _, Boolean buffer)
   at Microsoft.EntityFrameworkCore.Storage.Internal.NoopExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.GetResult[TResult](IEnumerable`1 valueBuffers, Boolean throwOnNullResult)
   at lambda_method(Closure )
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ResultEnumerable`1.GetEnumerator()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext()
   at System.Linq.Enumerable.TryGetFirst[TSource](IEnumerable`1 source, Boolean& found)
   at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass15_1`1.<CompileQueryCore>b__0(QueryContext qc)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.Count[TSource](IQueryable`1 source)
   at iDooz.Controllers.DoozController..ctor() in /home/c343/Documents/iDooz_1/Controllers/DoozController.cs:line 24
   at lambda_method(Closure , IServiceProvider , Object[] )
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
^CApplication is shutting down...

但是，api/values，webapi 应用程序中的默认 API 工作正常，我得到了正确的输出，就像我之前在 Ubuntu 上得到的一样。

注意：首先，这个项目通常是为了构建一个 Tic Toc Toe 并使用 ASP.NET Core Web API 了解 REstful APIs。因此，我使用 Entity Framework 创建了一个名为 Dooz.db 的数据库，它位于项目的主目录中。其次，我正在做 dotnet publish -c Release -r linux-arm 因为 .NET Core SDK 不适用于 ARM 处理器。第三，这是终端输出错误的代码部分

at System.Linq.Queryable.Count[TSource](IQueryable`1 source)
       at iDooz.Controllers.DoozController..ctor() in /home/c343/Documents/iDooz_1/Controllers/DoozController.cs:line 24

代码如下：

public class DoozController : ControllerBase
    {
        public DoozController()
        {
            if(db.Players.Count() == 0)
            {
                db.Players.Add(new Player { PlayerID = 1, Username = "Alex123", Password = "1234", ProfilePic = "ProfilePics/Alex123.jpg" });
                db.Players.Add(new Player { PlayerID = 2, Username = "Ashkan_007", Password = "12345", ProfilePic = "ProfilePics/Ashkan_007.jpg" });
.
.
.
                db.SaveChanges();
            }
        }
.
.
.

Answer 1

您需要将数据库文件复制到发布文件夹中。

ASP.NET Web API 在 raspberry pi 2 (ARM) 上运行时导致异常

ASP.NET Web API cause exceptions while running on raspberry pi 2 (ARM)

sqlite

raspberry-pi

asp.net-web-api2

entity-framework-core

asp.net-core

ASP.NET Web API 在 raspberry pi 2 (ARM) 上 运行 时导致异常

ASP.NET Web API cause exceptions while running on raspberry pi 2 (ARM)

sqlite

raspberry-pi

asp.net-web-api2

entity-framework-core

asp.net-core

ASP.NET Web API 在 raspberry pi 2 (ARM) 上运行时导致异常