尽管在appsettings中设置了一个很大的超时值，为什么我会得到查询超时

Question

我有一个数据提供者类。下面是它的简化版本。

namespace EmployeeManager
{
    public class EmployeeDataProvider : IEmployeeDataProvider
    {
        private DataObjects.EmployeeServiceContext databaseContext;

        IDbContextTransaction transaction;

        public EmployeeDataProvider(DataObjects.EmployeeServiceContext context)
        {
            this.databaseContext = context;
        }

        public void CreateEmployee(Id employeeId, string description)
        {
            transaction = databaseContext.Database.BeginTransaction();

            var employeeDto = databaseContext.Employee.Where(x => x.EmployeeId == employeeId).FirstOrDefault();
            if (employeeDto == null)
            {
                databaseContext.Employee.Add(new DataObjects.Employee() { EmployeeId = employeeId, Description = description });
            }
        }
        public void AddOrUpdateEmployeeData(EmployeeData data)
        {
            // Add or updates multiple Employee related tables

        }

        public void CommitChanges()
        {
            if (databaseContext.ChangeTracker.HasChanges())
                databaseContext.SaveChanges();
            transaction.Commit();
            transaction.Dispose();
        }
        public void RollbackChanges()
        {
            if (transaction != null)
            {
                transaction.Rollback();
                transaction.Dispose();
            }
        }
    }
}

多个客户端可以调用使用此提供程序的相关服务。其设置如下Startup.cs。

 public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            .....
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            ......
            services.AddTransient(typeof(IEmployeeDataProvider), typeof(EmployeeDataProvider));


        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            app.UseStaticFiles();
            app.UseDeveloperExceptionPage();
            app.UseMvc();
        }
    }

在不同的负载条件下，我在日志文件中看到了很多内容。请注意，没有任何堆栈跟踪指向我的类中的任何方法。

Microsoft.EntityFrameworkCore.Query.Internal.SqlServerQueryCompilationContextFactory|An exception occurred in the database while iterating the results of a query.
System.Data.SqlClient.SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception: The wait operation timed out
   --- End of inner exception stack trace ---
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, String executeMethod, IReadOnlyDictionary`2 parameterValues, Boolean closeConnection)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteReader(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable.Enumerator.BufferlessMoveNext(Boolean buffer)
   at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](Func`2 operation, Func`2 verifySucceeded, TState state)
   at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.<_ShapedQuery>d__3`1.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.<_TrackEntities>d__15`2.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext()

我在appsettings.json中的连接字符串如下。

  

“AppConnectionString”：“Server = MyPC; User   ID = myuser;密码= mypassword;数据库= myDb;连接超时= 2000“

错误发生在一分钟内，因此它不像查询等待2000秒查询超时。我是否还需要在代码中的某处设置超时？