我遇到了一个非常奇怪的WCF问题。我在解决方案中有2个项目，每个项目都会启动一些自托管的WCF服务。
项目1：
myService = new ServiceHost(typeof(MyService1));
哪个运行正常。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
Fusion Log：
=== 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文件系统观察程序，但除了devenv.exe试图跟踪.pdb文件以生成堆栈跟踪外，它没有显示“FileNotFound”错误。
任何人对于该怎么看都有其他想法？
更新＃1
我检查了进程的融合日志，看起来很奇怪。 System.ServiceModel有两个日志条目，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......
答案 0 :(得分：2)
找到我的问题：
对于这两个项目（让我们称之为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，上面有例外。出于某些原因，仅在Proj2中，它只在尝试解析“System.ServiceModel”时在我的private \ bin文件夹中查找。
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" />
一切都有效。有多奇怪......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项目，但是嘿......至少我现在可以回去工作了：）
答案 1 :(得分：0)
几个问题：
答案 2 :(得分：0)
我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，这会导致本地环境出现问题？