-
使用.net core 默認依賴注入時，數據庫上下文dbcontext大部分使用的都是 scoped service
-
.net core 在執行多線程操作時，如果主線程已經結束並返回，那么dbcontext也會被釋放，此時子線程仍需要訪問數據庫上下文時，會出現無法訪問已關閉資源的錯誤
-
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();
}
}
*解決方案
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();
}
}