有人可以向我解释为什么我收到以下错误：当我导入类时，IIS 服务器的当前上下文中不存在名称“Messanger”，甚至 Visual Studio 都没有检测到错误？
xxxxx.Models.Messanger：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace XXXX.Models
{
public class Messanger
{
private Messanger()
{
}
public static Messanger Instance
{
get
{
var output = HttpContext.Current.Session["MessangerInstance"] as Messanger;
if (output == null)
{
output = new Messanger();
HttpContext.Current.Session["MessangerInstance"] = output;
}
return output;
}
}
private List<string> Success = new List<string>();
private List<string> Info = new List<string>();
private List<string> Warning = new List<string>();
public void addSuccess(string message)
{
Success.Add(message);
}
public void addSuccess(List<string> messages)
{
Success.AddRange(messages);
}
public void addInfo(string message)
{
Info.Add(message);
}
public void addInfo(List<string> messages)
{
Info.AddRange(messages);
}
public void addWarning(string message)
{
Warning.Add(message);
}
public void addWarning(List<string> messages)
{
Warning.AddRange(messages);
}
public List<string> getSuccess()
{
return Success;
}
public List<string> getInfo()
{
return Info;
}
public List<string> getWarning()
{
return Warning;
}
public void addMessage(IMessageType message)
{
if (message.getType() == "success")
{
Success.Add(message.getMessage());
}
else if (message.getType() == "warning")
{
Warning.Add(message.getMessage());
}
else Info.Add(message.getMessage());
}
public void addMessage(List<IMessageType> messages)
{
foreach (IMessageType message in messages)
{
addMessage(message);
}
}
public int getMessageCount()
{
return Success.Count + Info.Count + Warning.Count;
}
public bool ThereAreMessages()
{
return (getMessageCount() > 0);
}
}
public interface IMessageType
{
string getType();
string getMessage();
}
public abstract class Message : IMessageType
{
private string MessageStore;
private string Type;
public Message(string message, string type)
{
this.MessageStore = message;
this.Type = type;
}
string IMessageType.getType()
{
return Type;
}
string IMessageType.getMessage()
{
return this.MessageStore;
}
}
public class SuccessMessage : Message
{
public SuccessMessage(string message)
: base(message, "success")
{
}
}
public class InfoMessage : Message
{
public InfoMessage(string message)
: base(message, "info")
{
}
}
public class WarningMessage : Message
{
public WarningMessage(string message)
: base(message, "warning")
{
}
}
}
我的 _Layout.cshtml Razor 视图是：
@using XXXXX.Models
<!DOCTYPE html>
<html>
<head>
<title>XXXXX - @ViewBag.Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap -->
<link href="@Url.Content("/css/bootstrap.css")" rel="stylesheet" media="screen">
<link href="@Url.Content("/css/bootstrap-glyphicons.css")" rel="stylesheet">
</head>
<body>
<div class="navbar navbar-inverse">
<div class="container">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Project name</a>
<div class="nav-collapse collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#about">About</a></li>
<li><a href="#contact">Contact</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li class="nav-header">Nav header</li>
<li><a href="#">Separated link</a></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<form class="navbar-form form-inline pull-right" method="post" action="@Url.Action("Login", "Account", new {ReturnUrl = ViewBag.ReturnUrl})">
@Html.AntiForgeryToken()
<input type="text" name="UserName" autofocus placeholder="Username">
<input type="password" placeholder="Password" name="Password">
<input type="hidden" value="true" name="RememberMe">
<button type="submit" class="btn btn-default">Log in</button>
</form>
</div><!--/.nav-collapse -->
</div>
</div>
<div class="container">
@if (Messanger.Instance.ThereAreMessages())
{
if(Messanger.Instance.getWarning().Count > 0)
{
<div class="row" style="text-align: center;">
<div class="alert alert-danger">
<button type="button" class="close" data-dismiss="alert">×</button>
@foreach (string message in Messanger.Instance.getWarning())
{
@message;<br>
}
</div>
</div>
}
if (Messanger.Instance.getSuccess().Count > 0)
{
<div class="row">
<div class="alert alert-success">
<button type="button" class="close" data-dismiss="alert">×</button>
@foreach (string message in Messanger.Instance.getSuccess())
{
@message;
}
</div>
</div>
}
if (Messanger.Instance.getInfo().Count > 0)
{
<div class="row">
<div class="alert alert-info">
<button type="button" class="close" data-dismiss="alert">×</button>
@foreach (string message in Messanger.Instance.getInfo())
{
@message;
}
</div>
</div>
}
}
@RenderBody()
</div>
<!-- End of content-->
<script src="@Url.Content("/js/jquery-2.0.3.min.js")"></script>
<script src="@Url.Content("/js/bootstrap.js")"></script>
</body>
</html>
尝试在第 49 行访问 XXXXX.Models.Messanger.ThereAreMessages() 时出现错误。
编辑：我设法通过使模型类静态来修复第一个错误。之后我遇到了一个奇怪的错误，但我意识到我在视图文件的 webconfig 中添加了 System.Models 导致错误。
现在我有另一个问题。我使用 Messanger 在整个站点中获取消息。我有一个登录表单，如果提交的数据无效，我会将错误推送到 Messanger，然后显示它们。问题在于，当数据无效时，错误会按预期显示，但每次刷新后，相同的消息会一次又一次地堆积。ASP.NET 是无状态的，每次刷新后，类应该再次实例化，我没有将消息存储到数据库中，但它们仍然保持堆叠。有人可以帮我解决吗？