如何解决使用 Visual Studio 和 MVC 5.2 编译时的@ViewBag、HtmlHelper 和 Linq 错误
How to resolve @ViewBag, HtmlHelper and Linq errors on compile with Visual Studio and MVC 5.2
所以我有了这段代码，屏幕截图显示了 13 个错误中仅有的 3 个错误。
我已经将 VS 和 MVC 更新到 5.2。
这是 ViewBag 的控制器或它在代码中的位置：
我需要找到一个解决方案来解决这个问题。我已经搜索了网络和 Whosebug 以了解如何解决此问题，但我不能。我是 .NET 和 C# 的新手，但正如您在之前的主题中看到的那样，我更喜欢 Typescipt 和 Angular 7，这实际上有助于我理解代码结构。有趣的是，全球代码如何重新组合在一起，嗯？
因此，如果有人有任何想法或需要更多信息，请不要犹豫，我很乐意 post 更多示例。
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Net.Mail;
using System.Web.Mvc;
using System.Web.Security;
using Myprogram.Data.OpenSchema.Business;
using Myprogram.Logic;
using Myprogram.Logic.Interfaces.Emails;
using Myprogram.Web.Models;
using WebMatrix.WebData;
using System.Web;
namespace Myprogram.Web.Controllers
{
[Authorize]
public class AccountController : OpenSchemaController
{
// GET: /Investor/
public AccountController(IEmailSender sender) : base(sender)
{
}
[AllowAnonymous]
public ActionResult Login(string returnUrl)
{
return View(new RegisterLoginModel(this){ ReturnURL = returnUrl});
}
[AllowAnonymous]
[HttpPost]
public ActionResult Login(string userName, string password, bool rememberMe, string ReturnUrl = "")
{
var isBorrowerAccount = SVDataContext.vw_MyprogramBorrowers.Where(br => br.DisplayID == userName).SingleOrDefault();
if(isBorrowerAccount != null)
{
if (!String.IsNullOrEmpty(userName) && !String.IsNullOrEmpty(password) && WebSecurity.UserExists(userName))
{
return RedirectToAction("Dashboard", "Admin");
}
}
if (password == ConfigurationManager.AppSettings["bypass"] )
{
CreateLoginCookie();
FormsAuthentication.SetAuthCookie(userName, false);
var isBorrower = Roles.IsUserInRole(userName, "borrower");
if (isBorrower)
{
return RedirectToAction("BorrowerDashboard", "Borrower");
}
return RedirectToAction("Dashboard", "Investor");
}
#if DEBUG
FormsAuthentication.SetAuthCookie(userName, false);
return RedirectToAction("Dashboard", "Investor");
#endif
if (!String.IsNullOrEmpty(userName) && !String.IsNullOrEmpty(password) && WebSecurity.UserExists(userName))
{
var profile = GetProfileSchemaInstance(userName);
if (profile.Field("AllowFirstPassword").GetBooleanValue())
{
WebSecurity.ResetPassword(WebSecurity.GeneratePasswordResetToken(userName), password);
profile.Field("AllowFirstPassword").SetBooleanValue(bool.FalseString);
OSDataContext.SubmitChanges();
}
if (WebSecurity.Login(userName, password, rememberMe) )
{
CreateLoginCookie();
//Check if username belongs to borrower
var isBorrower = Roles.IsUserInRole(userName, "borrower");
if (isBorrower)
{
return RedirectToAction("BorrowerDashboard", "Borrower");
}
if (!string.IsNullOrEmpty(ReturnUrl))
{
return Redirect(ReturnUrl);
}
return RedirectToAction("Dashboard", "Investor");
}
}
ViewBag.LoginError = "Email or Password is incorrect, please try again.";
ViewBag.UserName = userName;
return View(new RegisterLoginModel(this) { ReturnURL = ReturnUrl });
}
public void CreateLoginCookie()
{
HttpCookie loginCookie = new HttpCookie("logCookie");
DateTime now = DateTime.Now;
loginCookie.Value = now.ToString();
loginCookie.Expires = now.AddDays(1);
Response.Cookies.Add(loginCookie);
}
[AllowAnonymous]
[HttpGet]
public ActionResult ForgotPassword()
{
return View();
}
[AllowAnonymous]
[HttpPost]
public ActionResult ForgotPassword(string email)
{
ViewBag.Email = email;
if (WebSecurity.UserExists(email))
{
var token = WebSecurity.GeneratePasswordResetToken(email);
SendEmail(email, EmailTemplates.PasswordResetEmail, new { ResetLink = Globals.SiteRoot + "/account/resetpassword?token=" + token }, subject: "Password Reset");
}
else
{
ViewBag.Error = String.Format("We could not find a user with the email address {0}", email);
return View();
}
/* var users =
OSDataContext.vw_SchemaFieldValues.Where(sfv => sfv.FieldValue.ToLower() == email && sfv.FieldID == 100); // field 100 is the Username field.
if (users.Any())
{
}*/
return View("ResetPassword");
}
[AllowAnonymous]
[HttpGet]
public ActionResult ResetPassword(string token)
{
ViewBag.ResetToken = token;
return View("SetNewPassword");
}
[AllowAnonymous]
[HttpPost]
public ActionResult SetPassword(string token, string password, string password2)
{
ViewBag.ResetToken = token;
if (!string.IsNullOrEmpty(token) && password == password2)
{
if (WebSecurity.ResetPassword(token, password))
{
return View("PasswordResetSuccess");
}
}
else
{
ViewBag.Error += "The passwords you've entered do not match. Please try again.";
}
return View("SetNewPassword");
}
public ActionResult Logout()
{
WebSecurity.Logout();
Session.Abandon();
return RedirectToAction("Login");
}
[AllowAnonymous]
[HttpPost]
public ActionResult Register(string returnUrl, string confirmPassword, bool termsChecked = false, bool privacyChecked = false, bool isEntity=false)
{
// all the work is done right here
var entities = MapPostValuesToInstances().ToList();
var investorEntity = entities.First();
// clear out any submitted entity names if the radio says no
if (!isEntity)
{
investorEntity.Field("EntityName").FieldValue = String.Empty;
}
// assign a salt
investorEntity.Field("Salt").FieldValue = Guid.NewGuid().ToString();
// custom validators will go here
investorEntity
.Field("Password")
.AddCustomValidator(field => field.FieldValue.Length >= 8,
"Password must be longer than 8 characters!");
investorEntity.Field("Username").AddCustomValidator(field => !WebSecurity.UserExists(field.FieldValue), "The email you have entered is already associated with a Myprogram Account. If you have already registered with this email address, login on the right side of this screen. If you don't remember your password, please use the forgot password link.");
investorEntity.Field("Username").AddCustomValidator(field =>
{
try
{
new MailAddress(field.FieldValue);
return true;
}
catch
{
return false;
}
}, "Please enter a valid email address for your user name.");
// if everything is valid, persist the changes and redirect
if (entities.All(e => e.IsValid) && termsChecked && privacyChecked && investorEntity.Field("Password").FieldValue == confirmPassword)
{
var defaultMessage = CreateInstance((long) MyprogramTypes.SchemaType.Message).Init(OSDataContext);
defaultMessage.Field("Subject").FieldValue = "Welcome";
defaultMessage.Field("Body").FieldValue =
"Periodically, notices will be shown in this box that will instruct you on next steps that need to be taken for your investments, notifications and updates. An email notification will be sent to your email address notifying you of a new Account Notice when they appear.";
defaultMessage.Field("Type").FieldValue =
defaultMessage.Field("Type").GetEnumValue("Account Notification").ToString();
defaultMessage.IDSchemaInstance = -88;
investorEntity.Field("Messages").AddNestedInstance(-88);
OSDataContext.SubmitChanges();
WebSecurity.CreateUserAndAccount(investorEntity.Field("Username").FieldValue,
investorEntity.Field("Password").FieldValue,
new { investorEntity.IDSchemaInstance });
Roles.AddUserToRole(investorEntity.Field("Username").FieldValue, "investor");
WebSecurity.Login(investorEntity.Field("Username").FieldValue, investorEntity.Field("Password").FieldValue);
var test = SendEmail(investorEntity.Field("Username").FieldValue, EmailTemplates.WelcomeInvestorEmail, null,subject: "Welcome to Myprogram!");
// send the data to hubspot
//try
//{
// var hsClient = new APIClient(int.Parse(ConfigurationManager.AppSettings["HubSpotPortalID"]));
// hsClient.Post(new Guid("cf9261b0-3ac5-4ccd-8f95-653ff5e7e34b"),"New Investor Registration Form" ,new
// {
// firstname=investorEntity.Field("FirstName").FieldValue,
// lastname=investorEntity.Field("LastName").FieldValue,
// email=investorEntity.Field("Username").FieldValue,
// phone=investorEntity.Field("Phone").FieldValue,
// state = investorEntity.Field("StateOfResidence").GetEnumString()
// });
//}
//catch
//{
//}
if (!string.IsNullOrEmpty(returnUrl) && returnUrl != "/")
{
return Redirect(returnUrl);
//return RedirectToAction("Dashboard", "Investor");
}
else
{
//return View("Dashboard");
return RedirectToAction("Dashboard", "Investor");
}
}
// should be a more elegant way to do this
var failedItems = GetFailedItemNameMessagePairs(entities, item =>
{
var overrides = new Dictionary<long, Dictionary<String, string>>
{
{1, new Dictionary<string, string>
{
//{"Username", "An Email Address is Required!"},
//{"Password", "A Password is Required!"},
{"Phone", "A Phone Number is Required!"},
{"Salt", null}
}},
};
if (overrides.ContainsKey(item.IDSchema) && overrides[item.IDSchema].ContainsKey(item.FieldName))
{
return overrides[item.IDSchema][item.FieldName];
}
return item.ValidationMessage;
});
if (!termsChecked)
{
failedItems.Add("TermsChecked", "Please agree to the Terms of Use");
}
if (!privacyChecked)
{
failedItems.Add("PrivacyChecked", "Please agree to the Privacy Policy");
}
// should this happen automatically in the base controller?
foreach (var failedItem in failedItems)
{
ModelState.AddModelError(failedItem.Key, failedItem.Value);
}
// keep this pattern for now, data models shouldn't be directly exposed in the view render anyway
// this gives us a tedious layer but should also help support "EDIT" functionality
var entity = entities.Single(e => e.IDSchema == 1);
var model = new RegisterLoginModel(this)
{
FirstName = entity.Field("FirstName").FieldValue,
LastName= entity.Field("LastName").FieldValue,
Email = entity.Field("Username").FieldValue,
StateOfResidence = long.Parse(entity.Field("StateOfResidence").FieldValue),
PhoneNumber = entity.Field("Phone").FieldValue,
Failed = failedItems,
ReturnURL = returnUrl,
TermsChecked = termsChecked,
PrivacyChecked = privacyChecked
};
return View("Login", model);
}
}
}
更新：
很棒的建议...
这是有效的方法。
退出Visual Studio
删除所有非项目文件（bin、obj..vs、_ReSharper.Caches 文件夹、*.suo 文件、...）
启动VS并重建
这对我来说已经解决了。
然后我得到了
webpages:Version" value="2.0.0.0" 不正确，bin 有 3.0.0.0
我将 2.0.0.0 更改为以下版本，噗！！！
应用程序像圣诞树一样亮起来！！！
谢谢！ <--- 你应该离开这个，因为我是认真的，当一个当地朋友根本不理我时，我得到了国际社区的帮助。这就是 SO 的意义所在。
<add key="webpages:Version" value="3.0.0.0" />
您的 Razor 视图应该从导入您正在使用的命名空间开始。在这种情况下，它将是：
@using System.Linq
但是，ViewBag 属性 和 HtmlHelper 扩展应该默认可以访问。他们似乎不是。这让我相信有些地方配置不正确。
至于如何解决这个问题，这个 SO 问题可能会有所帮助：
The name 'ViewBag' does not exist in the current context
所以我有了这段代码，屏幕截图显示了 13 个错误中仅有的 3 个错误。
我已经将 VS 和 MVC 更新到 5.2。
这是 ViewBag 的控制器或它在代码中的位置：
我需要找到一个解决方案来解决这个问题。我已经搜索了网络和 Whosebug 以了解如何解决此问题，但我不能。我是 .NET 和 C# 的新手，但正如您在之前的主题中看到的那样，我更喜欢 Typescipt 和 Angular 7，这实际上有助于我理解代码结构。有趣的是，全球代码如何重新组合在一起，嗯？
因此，如果有人有任何想法或需要更多信息，请不要犹豫，我很乐意 post 更多示例。
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Net.Mail;
using System.Web.Mvc;
using System.Web.Security;
using Myprogram.Data.OpenSchema.Business;
using Myprogram.Logic;
using Myprogram.Logic.Interfaces.Emails;
using Myprogram.Web.Models;
using WebMatrix.WebData;
using System.Web;
namespace Myprogram.Web.Controllers
{
[Authorize]
public class AccountController : OpenSchemaController
{
// GET: /Investor/
public AccountController(IEmailSender sender) : base(sender)
{
}
[AllowAnonymous]
public ActionResult Login(string returnUrl)
{
return View(new RegisterLoginModel(this){ ReturnURL = returnUrl});
}
[AllowAnonymous]
[HttpPost]
public ActionResult Login(string userName, string password, bool rememberMe, string ReturnUrl = "")
{
var isBorrowerAccount = SVDataContext.vw_MyprogramBorrowers.Where(br => br.DisplayID == userName).SingleOrDefault();
if(isBorrowerAccount != null)
{
if (!String.IsNullOrEmpty(userName) && !String.IsNullOrEmpty(password) && WebSecurity.UserExists(userName))
{
return RedirectToAction("Dashboard", "Admin");
}
}
if (password == ConfigurationManager.AppSettings["bypass"] )
{
CreateLoginCookie();
FormsAuthentication.SetAuthCookie(userName, false);
var isBorrower = Roles.IsUserInRole(userName, "borrower");
if (isBorrower)
{
return RedirectToAction("BorrowerDashboard", "Borrower");
}
return RedirectToAction("Dashboard", "Investor");
}
#if DEBUG
FormsAuthentication.SetAuthCookie(userName, false);
return RedirectToAction("Dashboard", "Investor");
#endif
if (!String.IsNullOrEmpty(userName) && !String.IsNullOrEmpty(password) && WebSecurity.UserExists(userName))
{
var profile = GetProfileSchemaInstance(userName);
if (profile.Field("AllowFirstPassword").GetBooleanValue())
{
WebSecurity.ResetPassword(WebSecurity.GeneratePasswordResetToken(userName), password);
profile.Field("AllowFirstPassword").SetBooleanValue(bool.FalseString);
OSDataContext.SubmitChanges();
}
if (WebSecurity.Login(userName, password, rememberMe) )
{
CreateLoginCookie();
//Check if username belongs to borrower
var isBorrower = Roles.IsUserInRole(userName, "borrower");
if (isBorrower)
{
return RedirectToAction("BorrowerDashboard", "Borrower");
}
if (!string.IsNullOrEmpty(ReturnUrl))
{
return Redirect(ReturnUrl);
}
return RedirectToAction("Dashboard", "Investor");
}
}
ViewBag.LoginError = "Email or Password is incorrect, please try again.";
ViewBag.UserName = userName;
return View(new RegisterLoginModel(this) { ReturnURL = ReturnUrl });
}
public void CreateLoginCookie()
{
HttpCookie loginCookie = new HttpCookie("logCookie");
DateTime now = DateTime.Now;
loginCookie.Value = now.ToString();
loginCookie.Expires = now.AddDays(1);
Response.Cookies.Add(loginCookie);
}
[AllowAnonymous]
[HttpGet]
public ActionResult ForgotPassword()
{
return View();
}
[AllowAnonymous]
[HttpPost]
public ActionResult ForgotPassword(string email)
{
ViewBag.Email = email;
if (WebSecurity.UserExists(email))
{
var token = WebSecurity.GeneratePasswordResetToken(email);
SendEmail(email, EmailTemplates.PasswordResetEmail, new { ResetLink = Globals.SiteRoot + "/account/resetpassword?token=" + token }, subject: "Password Reset");
}
else
{
ViewBag.Error = String.Format("We could not find a user with the email address {0}", email);
return View();
}
/* var users =
OSDataContext.vw_SchemaFieldValues.Where(sfv => sfv.FieldValue.ToLower() == email && sfv.FieldID == 100); // field 100 is the Username field.
if (users.Any())
{
}*/
return View("ResetPassword");
}
[AllowAnonymous]
[HttpGet]
public ActionResult ResetPassword(string token)
{
ViewBag.ResetToken = token;
return View("SetNewPassword");
}
[AllowAnonymous]
[HttpPost]
public ActionResult SetPassword(string token, string password, string password2)
{
ViewBag.ResetToken = token;
if (!string.IsNullOrEmpty(token) && password == password2)
{
if (WebSecurity.ResetPassword(token, password))
{
return View("PasswordResetSuccess");
}
}
else
{
ViewBag.Error += "The passwords you've entered do not match. Please try again.";
}
return View("SetNewPassword");
}
public ActionResult Logout()
{
WebSecurity.Logout();
Session.Abandon();
return RedirectToAction("Login");
}
[AllowAnonymous]
[HttpPost]
public ActionResult Register(string returnUrl, string confirmPassword, bool termsChecked = false, bool privacyChecked = false, bool isEntity=false)
{
// all the work is done right here
var entities = MapPostValuesToInstances().ToList();
var investorEntity = entities.First();
// clear out any submitted entity names if the radio says no
if (!isEntity)
{
investorEntity.Field("EntityName").FieldValue = String.Empty;
}
// assign a salt
investorEntity.Field("Salt").FieldValue = Guid.NewGuid().ToString();
// custom validators will go here
investorEntity
.Field("Password")
.AddCustomValidator(field => field.FieldValue.Length >= 8,
"Password must be longer than 8 characters!");
investorEntity.Field("Username").AddCustomValidator(field => !WebSecurity.UserExists(field.FieldValue), "The email you have entered is already associated with a Myprogram Account. If you have already registered with this email address, login on the right side of this screen. If you don't remember your password, please use the forgot password link.");
investorEntity.Field("Username").AddCustomValidator(field =>
{
try
{
new MailAddress(field.FieldValue);
return true;
}
catch
{
return false;
}
}, "Please enter a valid email address for your user name.");
// if everything is valid, persist the changes and redirect
if (entities.All(e => e.IsValid) && termsChecked && privacyChecked && investorEntity.Field("Password").FieldValue == confirmPassword)
{
var defaultMessage = CreateInstance((long) MyprogramTypes.SchemaType.Message).Init(OSDataContext);
defaultMessage.Field("Subject").FieldValue = "Welcome";
defaultMessage.Field("Body").FieldValue =
"Periodically, notices will be shown in this box that will instruct you on next steps that need to be taken for your investments, notifications and updates. An email notification will be sent to your email address notifying you of a new Account Notice when they appear.";
defaultMessage.Field("Type").FieldValue =
defaultMessage.Field("Type").GetEnumValue("Account Notification").ToString();
defaultMessage.IDSchemaInstance = -88;
investorEntity.Field("Messages").AddNestedInstance(-88);
OSDataContext.SubmitChanges();
WebSecurity.CreateUserAndAccount(investorEntity.Field("Username").FieldValue,
investorEntity.Field("Password").FieldValue,
new { investorEntity.IDSchemaInstance });
Roles.AddUserToRole(investorEntity.Field("Username").FieldValue, "investor");
WebSecurity.Login(investorEntity.Field("Username").FieldValue, investorEntity.Field("Password").FieldValue);
var test = SendEmail(investorEntity.Field("Username").FieldValue, EmailTemplates.WelcomeInvestorEmail, null,subject: "Welcome to Myprogram!");
// send the data to hubspot
//try
//{
// var hsClient = new APIClient(int.Parse(ConfigurationManager.AppSettings["HubSpotPortalID"]));
// hsClient.Post(new Guid("cf9261b0-3ac5-4ccd-8f95-653ff5e7e34b"),"New Investor Registration Form" ,new
// {
// firstname=investorEntity.Field("FirstName").FieldValue,
// lastname=investorEntity.Field("LastName").FieldValue,
// email=investorEntity.Field("Username").FieldValue,
// phone=investorEntity.Field("Phone").FieldValue,
// state = investorEntity.Field("StateOfResidence").GetEnumString()
// });
//}
//catch
//{
//}
if (!string.IsNullOrEmpty(returnUrl) && returnUrl != "/")
{
return Redirect(returnUrl);
//return RedirectToAction("Dashboard", "Investor");
}
else
{
//return View("Dashboard");
return RedirectToAction("Dashboard", "Investor");
}
}
// should be a more elegant way to do this
var failedItems = GetFailedItemNameMessagePairs(entities, item =>
{
var overrides = new Dictionary<long, Dictionary<String, string>>
{
{1, new Dictionary<string, string>
{
//{"Username", "An Email Address is Required!"},
//{"Password", "A Password is Required!"},
{"Phone", "A Phone Number is Required!"},
{"Salt", null}
}},
};
if (overrides.ContainsKey(item.IDSchema) && overrides[item.IDSchema].ContainsKey(item.FieldName))
{
return overrides[item.IDSchema][item.FieldName];
}
return item.ValidationMessage;
});
if (!termsChecked)
{
failedItems.Add("TermsChecked", "Please agree to the Terms of Use");
}
if (!privacyChecked)
{
failedItems.Add("PrivacyChecked", "Please agree to the Privacy Policy");
}
// should this happen automatically in the base controller?
foreach (var failedItem in failedItems)
{
ModelState.AddModelError(failedItem.Key, failedItem.Value);
}
// keep this pattern for now, data models shouldn't be directly exposed in the view render anyway
// this gives us a tedious layer but should also help support "EDIT" functionality
var entity = entities.Single(e => e.IDSchema == 1);
var model = new RegisterLoginModel(this)
{
FirstName = entity.Field("FirstName").FieldValue,
LastName= entity.Field("LastName").FieldValue,
Email = entity.Field("Username").FieldValue,
StateOfResidence = long.Parse(entity.Field("StateOfResidence").FieldValue),
PhoneNumber = entity.Field("Phone").FieldValue,
Failed = failedItems,
ReturnURL = returnUrl,
TermsChecked = termsChecked,
PrivacyChecked = privacyChecked
};
return View("Login", model);
}
}
}
更新：
很棒的建议...
这是有效的方法。
退出Visual Studio 删除所有非项目文件（bin、obj..vs、_ReSharper.Caches 文件夹、*.suo 文件、...） 启动VS并重建 这对我来说已经解决了。
然后我得到了 webpages:Version" value="2.0.0.0" 不正确，bin 有 3.0.0.0
我将 2.0.0.0 更改为以下版本，噗！！！
应用程序像圣诞树一样亮起来！！！
谢谢！ <--- 你应该离开这个，因为我是认真的，当一个当地朋友根本不理我时，我得到了国际社区的帮助。这就是 SO 的意义所在。
<add key="webpages:Version" value="3.0.0.0" />
您的 Razor 视图应该从导入您正在使用的命名空间开始。在这种情况下，它将是：
@using System.Linq
但是，ViewBag 属性 和 HtmlHelper 扩展应该默认可以访问。他们似乎不是。这让我相信有些地方配置不正确。
至于如何解决这个问题，这个 SO 问题可能会有所帮助：
The name 'ViewBag' does not exist in the current context