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我遇到了 WCF 的一个非常奇怪的问题。我在一个解决方案中有 2 个项目，每个项目都启动了一些自托管的 WCF 服务。

项目一：

myService = new ServiceHost(typeof(MyService1));

运行良好。但是，当我尝试运行我的第二个项目时，其中包含：

meService = new ServiceHost(typeof(MyOtherService));

我得到了例外：

FileNotFoundException
Could not load file or assembly 'System.ServiceModel' or one of its dependencies.
The system cannot find the file specified.":"System.ServiceModel

融合日志：

=== Pre-bind state information ===
LOG: User = removed\removed
LOG: DisplayName = System.ServiceModel
 (Partial)
LOG: Appbase = file:///C:/Work/MySln/MyProj/bin/Dev
LOG: Initial PrivatePath = NULL
Calling assembly : System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Work\MySln\MyProj\bin\Dev\MyProj.dll.temp.config
LOG: Using machine configuration file from c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Work/MySln/MyProj/bin/Dev/System.ServiceModel.DLL.
LOG: Attempting download of new URL file:///C:/Work/MySln/MyProj/bin/Dev/System.ServiceModel/System.ServiceModel.DLL.
LOG: Attempting download of new URL file:///C:/Work/MySln/MyProj/bin/Dev/System.ServiceModel.EXE.
LOG: Attempting download of new URL file:///C:/Work/MySln/MyProj/bin/Dev/System.ServiceModel/System.ServiceModel.EXE.

真正奇怪的是，在调试器中，当我得到这个异常时，我可以进入 Visual Studio 中的“QuickWatch”并输入：

new MyOtherService()  // returns new instance properly
new ServiceHost()     // returns new instance properly
new ServiceHost(typeof(MyOtherService))  // throws exception, same as above.

我尝试在调试时运行 SysInternals File System Watcher，但除了 devenv.exe 试图跟踪 .pdb 文件以生成堆栈跟踪之外，它没有显示任何“FileNotFound”错误。

有人对看什么有其他想法吗？

更新#1

我查看了该过程的融合日志，似乎发生了一些奇怪的事情。System.ServiceModel 有 2 个日志条目，背靠背：

*** Assembly Binder Log Entry  (6/1/2009 @ 10:26:48 AM) ***

The operation was successful.
Bind result: hr = 0x0. The operation completed successfully.

Assembly manager loaded from:  c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll
Running under executable  C:\Program Files\TestDriven.NET 2.0\ProcessInvocation.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: User = removed\removed
LOG: DisplayName = System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
 (Fully-specified)
LOG: Appbase = file:///C:/Work/MySln/PFWebIntgTests/bin/Dev
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = C:\Documents and Settings\removed\Local Settings\Temp\TestDrivenShadowCopy\633794488082894732
LOG: AppName = domain-nunit.addin.dll
Calling assembly : PFWebIntgTests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Work\MySln\PFWebIntgTests\bin\Dev\PFWebIntgTests.dll.temp.config
LOG: Using machine configuration file from c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Post-policy reference: System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
LOG: Found assembly by looking in the GAC.
LOG: Binding succeeds. Returns assembly from C:\WINDOWS\assembly\GAC_MSIL\System.ServiceModel\3.0.0.0__b77a5c561934e089\System.ServiceModel.dll.
LOG: Assembly is loaded in default load context.

然后是第二个条目：

*** Assembly Binder Log Entry  (6/1/2009 @ 10:26:52 AM) ***

The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.

Assembly manager loaded from:  c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll
Running under executable  C:\Program Files\TestDriven.NET 2.0\ProcessInvocation.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: User = removed\removed
LOG: DisplayName = System.ServiceModel
 (Partial)
LOG: Appbase = file:///C:/Work/MySln/PFWebIntgTests/bin/Dev
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = C:\Documents and Settings\removed\Local Settings\Temp\TestDrivenShadowCopy\633794488082894732
LOG: AppName = domain-nunit.addin.dll
Calling assembly : System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Work\MySln\PFWebIntgTests\bin\Dev\PFWebIntgTests.dll.temp.config
LOG: Using machine configuration file from c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Work/MySln/PFWebIntgTests/bin/Dev/System.ServiceModel.DLL.
LOG: Attempting download of new URL file:///C:/Work/MySln/PFWebIntgTests/bin/Dev/System.ServiceModel/System.ServiceModel.DLL.
LOG: Attempting download of new URL file:///C:/Work/MySln/PFWebIntgTests/bin/Dev/System.ServiceModel.EXE.
LOG: Attempting download of new URL file:///C:/Work/MySln/PFWebIntgTests/bin/Dev/System.ServiceModel/System.ServiceModel.EXE.
LOG: All probing URLs attempted and failed.

所以它似乎尝试加载 System.ServiceModel 两次，一次从本地应用程序目录而不是 GAC？我很困惑...

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3 回答 3

2

发现我的问题：

对于这两个项目（我们称它们为 MyProj1 和 MyProj2），我在 .dll.config 文件中有这一行：

<serviceAuthorization principalPermissionMode="Custom" serviceAuthorizationManagerType="System.ServiceModel.ServiceAuthorizationManager, System.ServiceModel" />

Proj1 运行良好，Proj2 失败但上述异常。出于某种原因，仅在 Proj2 中，它仅在尝试解析“System.ServiceModel”时查看我的私人 \bin 文件夹。

如果我将上面的行更改为具有完整的程序集名称：

<serviceAuthorization principalPermissionMode="Custom" serviceAuthorizationManagerType="System.ServiceModel.ServiceAuthorizationManager, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

一切都恢复正常。多么奇怪......我不知道为什么完全相同的配置参考适用于一个项目而不是另一个，但是嘿......至少我现在可以回去工作了:)

于 2009-06-01T15:17:36.800 回答
0

几个问题：

  • 您的两个项目是否至少针对 .NET 框架 3.0 或更高版本？
  • 你能告诉我们这两个服务实现的接口，以及服务实现类本身的粗略轮廓吗？
于 2009-06-01T14:10:41.583 回答
0

我会尝试删除第二个项目中的引用并将其重新添加到 System.ServiceModel 程序集中。也许另一个开发人员使用本地文件而不是 GAC 版本添加了它，这会导致您的本地环境出现问题？

于 2009-06-01T14:12:05.280 回答