我正在使用Cassini / WebServer.WebDev使用NUnit运行WebService的一些自动化测试。
我没有做任何花哨的事情，只是
public class WebService{
Microsoft.VisualStudio.WebHost.Server _server;
public void Start(){
_server = new Microsoft.VisualStudio.WebHost.Server(_port, "/", _physicalPath);
}
public void Dispose()
{
if (_server != null)
{
_server.Stop();
_server = null;
}
}
}
[TestFixture]
public void TestFixture{
[Test]
public void Test(){
using(WebService webService = new WebService()){
webService.Start();
// actual test invoking the webservice
}
}
}
，但是当我使用nunit-console.exe运行它时，我得到以下输出：
NUnit version 2.5.0.9015 (Beta-2)
Copyright (C) 2002-2008 Charlie Poole.\r\nCopyright (C) 2002-2004 James W. Newki
rk, Michael C. Two, Alexei A. Vorontsov.\r\nCopyright (C) 2000-2002 Philip Craig
.\r\nAll Rights Reserved.
Runtime Environment -
OS Version: Microsoft Windows NT 6.0.6001 Service Pack 1
CLR Version: 2.0.50727.1434 ( Net 2.0.50727.1434 )
ProcessModel: Default DomainUsage: Default
Execution Runtime: net-2.0.50727.1434
.....
Tests run: 5, Errors: 0, Failures: 0, Inconclusive: 0 Time: 28,4538451 seconds
Not run: 0, Invalid: 0, Ignored: 0, Skipped: 0
Unhandled exceptions:
1) TestCase1 : System.AppDomainUnloadedException: Attempted to access an unloaded AppDomain.
2) TestCase2 : System.AppDomainUnloadedException: Attempted to access an unloaded AppDomain.
3) TestCase3 : System.AppDomainUnloadedException: Attempted to access an unloaded AppDomain.
4) TestCase4 : System.AppDomainUnloadedException: Attempted to access an unloaded AppDomain.
如果我在调试器下运行nunit-console，我会在调试控制台中获得以下输出：
[...]
The thread 0x1974 has exited with code 0 (0x0).
############################################################################
############## S U C C E S S #################
############################################################################
Executed tests : 5
Ignored tests : 0
Failed tests : 0
Unhandled exceptions : 4
Total time : 25,7092944 seconds
############################################################################
The thread 0x1bd4 has exited with code 0 (0x0).
The thread 0x10f8 has exited with code 0 (0x0).
The thread '<No Name>' (0x1a80) has exited with code 0 (0x0).
A first chance exception of type 'System.AppDomainUnloadedException' occurred in System.Web.dll
##### Unhandled Exception while running
System.AppDomainUnloadedException: Attempted to access an unloaded AppDomain.
at System.Web.Hosting.ApplicationManager.HostingEnvironmentShutdownComplete(String appId, IApplicationHost appHost)
at System.Web.Hosting.HostingEnvironment.OnAppDomainUnload(Object unusedObject, EventArgs unusedEventArgs)
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll
A first chance exception of type 'System.Threading.ThreadAbortException' occurred in System.Web.dll
The thread 0x111c has exited with code 0 (0x0).
The program '[0x1A64] nunit-console.exe: Managed' has exited with code -100 (0xffffff9c).
有没有人有任何想法可能导致这个？
答案 0 :(得分：7)
我遇到了同样的问题，但没有使用卡西尼。相反，我有自己的基于System.Net.HttpListener的Web服务器托管，通过System.Web.HttpRuntime支持ASP.Net，运行在通过System.Web.Hosting.ApplicationHost.CreateApplicationHost()创建的不同应用程序域中。这基本上是Cassini的工作方式，除了Cassini在套接字层工作并实现System.Net.HttpListener本身提供的许多功能。
无论如何，为了解决我的问题，我需要在让NUnit卸载我的应用程序域之前调用System.Web.HttpRuntime.Close()。我通过在我的[SetupFixture]类的[TearDown]方法调用的宿主代理类中公开一个新的Close()方法并且该方法调用System.Web.HttpRuntime.Close()来完成此操作。
我通过.Net Reflector查看了Cassini实现，尽管它使用了System.Web.HttpRuntime.ProcessRequest()，但它似乎无法在任何地方调用System.Web.HttpRuntime.Close()。
我不确定如何继续使用预先构建的Cassini实现（Microsoft.VisualStudio.WebHost.Server），因为您需要在Cassini创建的应用程序域中进行System.Web.HttpRuntime.Close()调用主持ASP.Net。
供参考，以下是我的工作单元测试的一些部分，包含嵌入式虚拟主机。
我的WebServerHost类是一个非常小的类，它允许将请求编组到System.Web.Hosting.ApplicationHost.CreateApplicationHost()创建的应用程序域中。
using System;
using System.IO;
using System.Web;
using System.Web.Hosting;
public class WebServerHost :
MarshalByRefObject
{
public void
Close()
{
HttpRuntime.Close();
}
public void
ProcessRequest(WebServerContext context)
{
HttpRuntime.ProcessRequest(new WebServerRequest(context));
}
}
WebServerContext类只是一个System.Net.HttpListenerContext实例的包装器，它派生自System.MarshalByRefObject，允许来自新ASP.Net托管域的调用回调到我的域中。
using System;
using System.Net;
public class WebServerContext :
MarshalByRefObject
{
public
WebServerContext(HttpListenerContext context)
{
this.context = context;
}
// public methods and properties that forward to HttpListenerContext omitted
private HttpListenerContext
context;
}
WebServerRequest类只是抽象System.Web.HttpWorkerRequest类的一个实现，它通过WebServerContext类从ASP.Net托管域回调到我的域。
using System;
using System.IO;
using System.Web;
class WebServerRequest :
HttpWorkerRequest
{
public
WebServerRequest(WebServerContext context)
{
this.context = context;
}
// implementation of HttpWorkerRequest methods omitted; they all just call
// methods and properties on context
private WebServerContext
context;
}
WebServer类是用于启动和停止Web服务器的控制器。启动时，ASP.Net托管域是使用我的WebServerHost类作为代理来创建的，以允许交互。还会启动System.Net.HttpListener实例，并启动单独的线程来接受连接。建立连接后，再次通过我的WebServerHost类在线程池中启动工作线程来处理请求。最后，当Web服务器停止时，监听器停止，控制器等待线程接受连接退出，然后关闭监听器。 最后，通过调用WebServerHost.Close()方法也关闭了HTTP运行时。
using System;
using System.IO;
using System.Net;
using System.Reflection;
using System.Threading;
using System.Web.Hosting;
class WebServer
{
public static void
Start()
{
lock ( typeof(WebServer) )
{
// do not start more than once
if ( listener != null )
return;
// create web server host in new AppDomain
host =
(WebServerHost)ApplicationHost.CreateApplicationHost
(
typeof(WebServerHost),
"/",
Path.GetTempPath()
);
// start up the HTTP listener
listener = new HttpListener();
listener.Prefixes.Add("http://*:8182/");
listener.Start();
acceptConnectionsThread = new Thread(acceptConnections);
acceptConnectionsThread.Start();
}
}
public static void
Stop()
{
lock ( typeof(WebServer) )
{
if ( listener == null )
return;
// stop listening; will cause HttpListenerException in thread blocked on GetContext()
listener.Stop();
// wait connection acceptance thread to exit
acceptConnectionsThread.Join();
acceptConnectionsThread = null;
// close listener
listener.Close();
listener = null;
// close host
host.Close();
host = null;
}
}
private static WebServerHost
host = null;
private static HttpListener
listener = null;
private static Thread
acceptConnectionsThread;
private static void
acceptConnections(object state)
{
while ( listener.IsListening )
{
try
{
HttpListenerContext context = listener.GetContext();
ThreadPool.QueueUserWorkItem(handleConnection, context);
}
catch ( HttpListenerException e )
{
// this exception is ignored; it will be thrown when web server is stopped and at that time
// listening will be set to false which will end the loop and the thread
}
}
}
private static void
handleConnection(object state)
{
host.ProcessRequest(new WebServerContext((HttpListenerContext)state));
}
}
最后，这个标有NUnit [SetupFixture]属性的Initialization类用于在单元测试启动时启动Web服务器，并在完成单元测试时将其关闭。
using System;
using NUnit.Framework;
[SetUpFixture]
public class Initialization
{
[SetUp]
public void
Setup()
{
// start the local web server
WebServer.Start();
}
[TearDown]
public void
TearDown()
{
// stop the local web server
WebServer.Stop();
}
}
我知道这并没有完全回答这个问题，但我希望你能找到有用的信息。