ASP.NET编译和回收后出现“无法加载App_Web_*.dll”异常
ASP.NET编译和回收后出现“无法加载App_Web_*.dll”异常
提问于 2010-10-29 19:55:42
我最近遇到了以下结构的代码：
FooService.csFooService.svcDefault.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 Server2003上使用.Net 4.0 (调试)和IIS6，通过一个“fooservice”和一个主机文件条目通过http://fooservice/FooService.svc调用web服务，通过http://fooservice/调用default.aspx。在这一点上，一切都运行得很好。
但是，在以下步骤之后，
- 在default.aspx中更改代码，保存文件
- Load http://fooservice/ (triggers ASP.NET app pool
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这里到底是怎么回事？
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(？)
<代码>H148删除对<代码>D49的静态引用也可以解决此问题(？)<代码>H250<代码>F251
回答 7
Stack Overflow用户
发布于 2011-12-16 05:39:55
我只是遇到了同样的问题，这个应用程序是一个web应用程序，所以完全预编译了。这为我解决了这个问题，但我不确定为什么：
<compilation debug="false" batch="false"> Stack Overflow用户
发布于 2011-12-12 08:23:59
正如前面提到的，这一定是一个编译器问题。如果您没有访问iis的权限，可以修改您自己的web.config文件以使用不同的临时目录。此修改将使iis重新编译您的代码，并使用此新编译。
<compilation tempDirectory="C:\...">iis_iusrs用户必须对此新目录具有写访问权限。
Stack Overflow用户
发布于 2010-11-16 04:04:26
代码不应为以下结构：
- FooService.cs
- FooService.svc
- Default.aspx
但以下内容：
- App_Code/FooService.cs
- FooService.svc
- Default.aspx
请注意包含源代码的特殊App_Code文件夹。
因此，简单回顾一下：
~/App_Code/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#" Debug="true" Service="FooService.FooService" CodeBehind="~/App_Code/FooService.cs" %>~/Web.config
<configuration>
<system.web>
<compilation debug="false" targetFramework="4.0" />
</system.web>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
</configuration>~/Default.aspx
<%@ Page Language="C#" %>
<% var foo = "bar"; %>也就是说，我建议您使用Web Applications instead of Web Sites并预编译所有内容，以避免此类问题。另一个好处是您不再需要在服务器上部署源代码。
如果使用预编译的web应用程序，您的结构将如下所示：
- bin/MyWebService.dll
- FooService.svc
- Default.aspx
这就是我推荐给你的。
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原文链接：
https://stackoverflow.com/questions/4051576
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