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使用.net core 默认依赖注入时，数据库上下文dbcontext大部分使用的都是 scoped service
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.net core 在执行多线程操作时，如果主线程已经结束并返回，那么dbcontext也会被释放，此时子线程仍需要访问数据库上下文时，会出现无法访问已关闭资源的错误
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先看示例
public class UserController : Controller
{
private readonly IAccountService _accountService;
public UserController(IAccountService accountService)
{
_accountService = accountService;
}
public IActionResult Test()
{
Task.Factory.StartNew(() =>
{
var account = _accountService.GetRoleList().FirstOrDefault();
account.Name = "foo";
_accountService.UpdateRole(account);
});
return View();
}
}
*解决方案
public class UserController : Controller
{
private readonly IAccountService _accountService;
private readonly IServiceScopeFactory _serviceScopeFactory;
public UserController(IAccountService accountService,
IServiceScopeFactory serviceScopeFactory)
{
_accountService = accountService;
_serviceScopeFactory = serviceScopeFactory;
}
public IActionResult Test()
{
Task.Factory.StartNew(() =>
{
using (var scope = _serviceScopeFactory.CreateScope())
{
var newAccountService = scope.ServiceProvider.GetRequiredService<IAccountService>();
var account = newAccountService.GetRoleList().FirstOrDefault();
account.Name = "foo";
newAccountService.UpdateRole(account);
}
});
return View();
}
}