asp.net - ASP.NET编译和回收后出现“无法加载App_Web _ *。dll”异常

我最近遇到了以下结构的代码：


FooService.cs
FooService.svc
Default.aspx


文件内容：

[FooService.cs]

using System.ServiceModel;

namespace FooService
{
    [ServiceContract]
    public class FooService
    {
        static FooEngine engine = new FooEngine();

        [OperationContract]
        public string Foo()
        {
            return "bar";
        }
    }

    public class FooEngine
    {

    }
}

[FooService.svc]

<%@ ServiceHost Language="C#" Service="FooService.FooService" %>

[Default.aspx]

<%@ Page Language="C#" %>
<% var foo = "bar"; %>

我们在Windows Server 2003上使用.Net 4.0（调试）和IIS6，并带有“ fooservice”网站和主机文件条目，以通过http://fooservice/FooService.svc调用Web服务，并通过http://fooservice/调用default.aspx。此时一切正常。

但是，执行以下步骤后，


更改default.aspx中的代码，保存文件
加载http://fooservice/（触发ASP.NET编译）
回收应用程序池


对http://fooservice/FooService.svc的调用失败，并引发以下异常

[FileNotFoundException: Could not load file or assembly 'App_Web_ynlv0b1k, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.]
   System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +0
   System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +39
   System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks) +132
   System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +144
   System.Reflection.Assembly.Load(String assemblyString) +28
   System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +208
   System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +1440
   System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +44
   System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +615

[ServiceActivationException: The service '/FooService.svc' cannot be activated due to an exception during compilation.  The exception message is: Could not load file or assembly 'App_Web_ynlv0b1k, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified..]
   System.Runtime.AsyncResult.End(IAsyncResult result) +679246
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +190
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, String routeServiceVirtualPath, Boolean flowContext, Boolean ensureWFService) +234
   System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e) +355
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

这到底是怎么回事？

备注


我知道ASP.NET正在编译并加载新的App_Web_*.dll（在第2步中），但是为什么它要在回收（3.）之后尝试加载旧的（已删除的）App_Web_*.dll？
在FooService.svc中使用完全相同的代码内联而不是单独的FooService.cs不会出现此问题（？）
删除对FooEngine的静态引用也会使此问题消失（？）

最佳答案

我只是有同样的问题，
该应用程序是一个Web应用程序，因此已完全预编译。
这为我解决了问题，但是我不确定为什么：

<compilation debug="false" batch="false">

我从这里得到了这个解决方案：http://web.archive.org/web/20140116171941/http://www.creative-jar.com/insights/labs/programming/could-not-load-file-or-assembly-app_web_/