首先，支持（至少）alsami的答案。那使我走上了正确的道路。
但对于那些进行IoC的人来说，这里有一些更深层次的探索。
我的错误（与其他错误相同）
发生一个或多个错误。（在上一个操作完成之前，第二个操作在此上下文上开始。这通常是由使用相同DbContext实例的不同线程引起的。有关如何避免DbContext出现线程问题的更多信息，请参见
https://go.microsoft.com。 / fwlink /？linkid = 2097913。）
我的代码设置。“只是基础” ...
public class MyCoolDbContext: DbContext{
public DbSet <MySpecialObject> MySpecialObjects { get; set; }
}
和
public interface IMySpecialObjectDomainData{}
和（注意正在注入MyCoolDbContext）
public class MySpecialObjectEntityFrameworkDomainDataLayer: IMySpecialObjectDomainData{
public MySpecialObjectEntityFrameworkDomainDataLayer(MyCoolDbContext context) {
this.entityDbContext = context ?? throw new ArgumentNullException("MyCoolDbContext is null", (Exception)null);
}
}
和
public interface IMySpecialObjectManager{}
和
public class MySpecialObjectManager: IMySpecialObjectManager
{
public const string ErrorMessageIMySpecialObjectDomainDataIsNull = "IMySpecialObjectDomainData is null";
private readonly IMySpecialObjectDomainData mySpecialObjectDomainData;
public MySpecialObjectManager(IMySpecialObjectDomainData mySpecialObjectDomainData) {
this.mySpecialObjectDomainData = mySpecialObjectDomainData ?? throw new ArgumentNullException(ErrorMessageIMySpecialObjectDomainDataIsNull, (Exception)null);
}
}
最后，从控制台应用程序（命令行界面应用程序）调用我的多线程类
public interface IMySpecialObjectThatSpawnsThreads{}
和
public class MySpecialObjectThatSpawnsThreads: IMySpecialObjectThatSpawnsThreads
{
public const string ErrorMessageIMySpecialObjectManagerIsNull = "IMySpecialObjectManager is null";
private readonly IMySpecialObjectManager mySpecialObjectManager;
public MySpecialObjectThatSpawnsThreads(IMySpecialObjectManager mySpecialObjectManager) {
this.mySpecialObjectManager = mySpecialObjectManager ?? throw new ArgumentNullException(ErrorMessageIMySpecialObjectManagerIsNull, (Exception)null);
}
}
和DI的积累。（同样，这是针对控制台应用程序（命令行界面）的……其行为与网络应用程序略有不同）
private static IServiceProvider BuildDi(IConfiguration configuration) {
string defaultConnectionStringValue = string.Empty;
IServiceCollection servColl = new ServiceCollection()
.AddTransient<IMySpecialObjectDomainData, MySpecialObjectEntityFrameworkDomainDataLayer>()
.AddTransient<IMySpecialObjectManager, MySpecialObjectManager>()
# if (MY_ORACLE)
.AddDbContext<ProvisioningDbContext>(options => options.UseOracle(defaultConnectionStringValue), ServiceLifetime.Transient);
# endif
# if (MY_SQL_SERVER)
.AddDbContext<ProvisioningDbContext>(options => options.UseSqlServer(defaultConnectionStringValue), ServiceLifetime.Transient);
# endif
servColl.AddSingleton <IMySpecialObjectThatSpawnsThreads, MySpecialObjectThatSpawnsThreads>();
ServiceProvider servProv = servColl.BuildServiceProvider();
return servProv;
}
令我惊讶的是
.AddTransient<IMySpecialObjectDomainData, MySpecialObjectEntityFrameworkDomainDataLayer>()
.AddTransient<IMySpecialObjectManager, MySpecialObjectManager>()
注意，我认为是因为将IMySpecialObjectManager注入到“ MySpecialObjectThatSpawnsThreads”中，所以这些注入的对象需要是Transient才能完成链。
关键是.........不仅需要。瞬变的（My）DbContext，还需要更大的DI图块。
调试提示：
这行：
this.entityDbContext = context ?? throw new ArgumentNullException("MyCoolDbContext is null", (Exception)null);
将调试器断点放在此处。如果您的MySpecialObjectThatSpawnsThreads正在创建N个线程（例如10个线程）……而该行仅被命中一次……那是您的问题。您的DbContext正在穿越线程。
奖金：
我建议阅读下面的url / article（老歌，但好东西），了解网络应用和控制台应用之间的差异
https://mehdi.me/ambient-dbcontext-in-ef6/
如果链接发生更改，这是文章的标题。
使用实体框架正确管理DBCONTEXT 6：深入指南Mehdi El Gueddari
我用WorkFlowCore https://github.com/danielgerlag/workflow-core碰到了这个问题
<ItemGroup>
<PackageReference Include="WorkflowCore" Version="3.1.5" />
</ItemGroup>
下面的示例代码..以帮助将来的互联网搜索者
namespace MyCompany.Proofs.WorkFlowCoreProof.BusinessLayer.Workflows.MySpecialObjectInterview.Workflows
{
using System;
using MyCompany.Proofs.WorkFlowCoreProof.BusinessLayer.Workflows.MySpecialObjectInterview.Constants;
using MyCompany.Proofs.WorkFlowCoreProof.BusinessLayer.Workflows.MySpecialObjectInterview.Glue;
using MyCompany.Proofs.WorkFlowCoreProof.BusinessLayer.Workflows.WorkflowSteps;
using WorkflowCore.Interface;
using WorkflowCore.Models;
public class MySpecialObjectInterviewDefaultWorkflow : IWorkflow<MySpecialObjectInterviewPassThroughData>
{
public const string WorkFlowId = "MySpecialObjectInterviewWorkflowId";
public const int WorkFlowVersion = 1;
public string Id => WorkFlowId;
public int Version => WorkFlowVersion;
public void Build(IWorkflowBuilder<MySpecialObjectInterviewPassThroughData> builder)
{
builder
.StartWith(context =>
{
Console.WriteLine("Starting workflow...");
return ExecutionResult.Next();
})
.Then(lastContext =>
{
Console.WriteLine();
bool wroteConcreteMsg = false;
if (null != lastContext && null != lastContext.Workflow && null != lastContext.Workflow.Data)
{
MySpecialObjectInterviewPassThroughData castItem = lastContext.Workflow.Data as MySpecialObjectInterviewPassThroughData;
if (null != castItem)
{
Console.WriteLine("MySpecialObjectInterviewDefaultWorkflow complete :) {0} -> {1}", castItem.PropertyOne, castItem.PropertyTwo);
wroteConcreteMsg = true;
}
}
if (!wroteConcreteMsg)
{
Console.WriteLine("MySpecialObjectInterviewDefaultWorkflow complete (.Data did not cast)");
}
return ExecutionResult.Next();
}))
.OnError(WorkflowCore.Models.WorkflowErrorHandling.Retry, TimeSpan.FromSeconds(60));
}
}
}
和
ICollection<string> workFlowGeneratedIds = new List<string>();
for (int i = 0; i < 10; i++)
{
MySpecialObjectInterviewPassThroughData currentMySpecialObjectInterviewPassThroughData = new MySpecialObjectInterviewPassThroughData();
currentMySpecialObjectInterviewPassThroughData.MySpecialObjectInterviewPassThroughDataSurrogateKey = i;
string wfid = await this.workflowHost.StartWorkflow(MySpecialObjectInterviewDefaultWorkflow.WorkFlowId, MySpecialObjectInterviewDefaultWorkflow.WorkFlowVersion, currentMySpecialObjectInterviewPassThroughData);
workFlowGeneratedIds.Add(wfid);
}