C# 提高datacontext save entityframework的性能

我在实体框架中使用带有工作单元的存储库模式，在尝试插入数据列表时面临性能问题

这是我的密码

var CurrentVersion = GlobalMethods.GetVersion(dFactory);
            var importedData = await GetImportData();
            _uow.BeginTransaction();
            try
            {
                foreach (var item in importedData)
                {

                        Account accountData = new Account()
                        {
                            AccountSiebelCode = item.account_code,
                            AccountName = item.account_name,
                            AccountZip = "",
                            CountryID = 1,
                            AccountRegistration = "",//null allowed
                            AccountDisabled = item.account_status != "active" ? true : false,
                            TMID = 0, //Trademark Id
                            AccountAreaNr = "",
                            Audit_User = User.Identity.Name,
                            VersionDataID = CurrentVersion.Item2,
                            VersionAction = "",//Set at Business
                            TokenKey = GlobalMethods.GetTokenAsync().Result
                        };
                        //string contactUserName = "";

                        string contactUserName = item.last_name.Replace(" ", "").Count() > 4 ? item.last_name.Replace(" ", "").Substring(0, 4) : item.last_name.Replace(" ", "");
                        contactUserName += item.first_name.Substring(0, 1).ToString();
                        Microsoft.AspNet.Identity.PasswordHasher haspwd= new Microsoft.AspNet.Identity.PasswordHasher();

                        Contact contactData = new Contact()
                        {
                            ContactSiebelCode = item.account_code,
                            AccountID = 0, //Account Id
                            ContactFirstName = item.first_name,
                            ContactLastName = item.last_name,
                            ContactTitle = "",
                            ContactType = "",
                            ContactDOB = DateTime.Now, // Dob
                            ContactEmail = item.email,
                            ContactMobile = "",
                            ContactPhone = item.phonenumber,
                            ContactDisabled = false, //contact disabled
                            ContactAppEnabled = true, //contact app enabled
                            UserName = contactUserName, //username
                            //PasswordHash = BCryptEncryption.Encrypt("Gr@fi0ffshore"), //password
                            //PasswordHash = haspwd.HashPassword("Gr@fi0ffshore"), //password
                            PasswordHash ="R1-"+ System.Web.Security.Membership.GeneratePassword(6,1), //password
                            PinCode = "1234", //picode
                            LockOutEnabled = false, //lockout
                            AccessFailedCount = 0, //accessfailedcount
                            Audit_User = User.Identity.Name,
                            VersionDataID = CurrentVersion.Item2,
                            VersionAction = "",//Set at Business
                            TokenKey = GlobalMethods.GetTokenAsync().Result

                        };
                        TradeMarketer tradeMarketerData = new TradeMarketer()
                        {
                            TMSiebelCode = item.account_code,
                            TMFirstName = item.trade_marketeer_firstname,
                            TMLastName = item.trade_marketeer_lastname,
                            TMEmail = "",
                            TMAreaNr = item.region,
                            CountryID = 1, //country id
                            Audit_User = User.Identity.Name,
                            VersionDataId = CurrentVersion.Item2,
                            VersionAction = "",//Set at Business
                            TokeyKey = GlobalMethods.GetTokenAsync().Result
                        };
                        _biznessTradeMarketer.Save(tradeMarketerData);
                        _uow.SaveChanges();

                        accountData.TMID = tradeMarketerData.TMID;
                        _biznessAccount.Save(accountData);
                        _uow.SaveChanges();

                        contactData.AccountID = accountData.AccountID;
                        _biznessContact.Save(contactData);
                        _uow.SaveChanges();
                }

                _uow.Commit();
            }
            catch (Exception ex)
            {
                _uow.Rollback();
                ModelState.AddModelError("", ex.InnerException);
            }

---

在上述情况下，似乎需要40到50秒才能在importedData对象中插入或更新450行。如果不执行savechanges（）之类的数据库操作，该操作将在几秒钟内完成。如何在这种情况下提高绩效。谢谢

尝试调用

\u uow.SaveChanges（）不在
foreach
循环内。在
\u uow.Commit（）之前执行此操作

尝试调用
\u uow.SaveChanges（）不在
foreach
循环内。在
\u uow.Commit（）之前执行此操作

尝试调用
\u uow.SaveChanges（）不在
foreach
循环内。在
\u uow.Commit（）之前执行此操作

尝试调用
\u uow.SaveChanges（）不在
foreach
循环内。在
\u uow.Commit（）之前执行此操作

我需要从帐户中的商标和联系人中的帐户Id插入商标Id，因为它们是外键，accountData.TMID=trademarketdata.TMID；contactData.AccountID=accountData.AccountID；在循环外调用save changes不会获取我看到的那些外键。。嗯，您可以尝试为每个导入的项目创建一个DbContext。因为DbContext引用每个实体，这将减慢每次保存的速度。我需要从帐户中的商标和联系人中的帐户Id插入商标Id，因为它们是外键，accountData.TMID=trademarketdata.TMID；contactData.AccountID=accountData.AccountID；在循环外调用save changes不会获取我看到的那些外键。。嗯，您可以尝试为每个导入的项目创建一个DbContext。因为DbContext引用每个实体，这将减慢每次保存的速度。我需要从帐户中的商标和联系人中的帐户Id插入商标Id，因为它们是外键，accountData.TMID=trademarketdata.TMID；contactData.AccountID=accountData.AccountID；在循环外调用save changes不会获取我看到的那些外键。。嗯，您可以尝试为每个导入的项目创建一个DbContext。因为DbContext引用每个实体，这将减慢每次保存的速度。我需要从帐户中的商标和联系人中的帐户Id插入商标Id，因为它们是外键，accountData.TMID=trademarketdata.TMID；contactData.AccountID=accountData.AccountID；在循环外调用save changes不会获取我看到的那些外键。。嗯，您可以尝试为每个导入的项目创建一个DbContext。因为DbContext引用每个实体，这会降低每次保存的速度。
var CurrentVersion = GlobalMethods.GetVersion(dFactory);
            var importedData = await GetImportData();
            _uow.BeginTransaction();
            try
            {
                foreach (var item in importedData)
                {

                        Account accountData = new Account()
                        {
                            AccountSiebelCode = item.account_code,
                            AccountName = item.account_name,
                            AccountZip = "",
                            CountryID = 1,
                            AccountRegistration = "",//null allowed
                            AccountDisabled = item.account_status != "active" ? true : false,
                            TMID = 0, //Trademark Id
                            AccountAreaNr = "",
                            Audit_User = User.Identity.Name,
                            VersionDataID = CurrentVersion.Item2,
                            VersionAction = "",//Set at Business
                            TokenKey = GlobalMethods.GetTokenAsync().Result
                        };
                        //string contactUserName = "";

                        string contactUserName = item.last_name.Replace(" ", "").Count() > 4 ? item.last_name.Replace(" ", "").Substring(0, 4) : item.last_name.Replace(" ", "");
                        contactUserName += item.first_name.Substring(0, 1).ToString();
                        Microsoft.AspNet.Identity.PasswordHasher haspwd= new Microsoft.AspNet.Identity.PasswordHasher();

                        Contact contactData = new Contact()
                        {
                            ContactSiebelCode = item.account_code,
                            AccountID = 0, //Account Id
                            ContactFirstName = item.first_name,
                            ContactLastName = item.last_name,
                            ContactTitle = "",
                            ContactType = "",
                            ContactDOB = DateTime.Now, // Dob
                            ContactEmail = item.email,
                            ContactMobile = "",
                            ContactPhone = item.phonenumber,
                            ContactDisabled = false, //contact disabled
                            ContactAppEnabled = true, //contact app enabled
                            UserName = contactUserName, //username
                            //PasswordHash = BCryptEncryption.Encrypt("Gr@fi0ffshore"), //password
                            //PasswordHash = haspwd.HashPassword("Gr@fi0ffshore"), //password
                            PasswordHash ="R1-"+ System.Web.Security.Membership.GeneratePassword(6,1), //password
                            PinCode = "1234", //picode
                            LockOutEnabled = false, //lockout
                            AccessFailedCount = 0, //accessfailedcount
                            Audit_User = User.Identity.Name,
                            VersionDataID = CurrentVersion.Item2,
                            VersionAction = "",//Set at Business
                            TokenKey = GlobalMethods.GetTokenAsync().Result

                        };
                        TradeMarketer tradeMarketerData = new TradeMarketer()
                        {
                            TMSiebelCode = item.account_code,
                            TMFirstName = item.trade_marketeer_firstname,
                            TMLastName = item.trade_marketeer_lastname,
                            TMEmail = "",
                            TMAreaNr = item.region,
                            CountryID = 1, //country id
                            Audit_User = User.Identity.Name,
                            VersionDataId = CurrentVersion.Item2,
                            VersionAction = "",//Set at Business
                            TokeyKey = GlobalMethods.GetTokenAsync().Result
                        };
                        _biznessTradeMarketer.Save(tradeMarketerData);

                        accountData.TMID = tradeMarketerData.TMID;
                        _biznessAccount.Save(accountData);

                        contactData.AccountID = accountData.AccountID;
                        _biznessContact.Save(contactData);

                }
                _uow.SaveChanges();
                _uow.Commit();
            }
            catch (Exception ex)
            {
                _uow.Rollback();
                ModelState.AddModelError("", ex.InnerException);
            }