我有一个简单的应用程序,通过这段代码从运行时从2个子文件夹加载两个程序集：
Assembly.Load("A,Version=1.0.0.0,Culture=neutral,PublicKeyToken=null");
Assembly.Load("B,PublicKeyToken=null");
目录结构是：
所以预期的载荷如下：
TheApp.exe -> A.dll -> C.dll (version 2.0.0.0)
-> B.dll -> C.dll (version 1.0.0.0)
请注意C.dll已签名,因此两个版本应并排加载.
为确保应用程序从正确的位置加载程序集,我将以下内容添加到应用程序配置文件中：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<probing privatePath="B;A" />
</assemblyBinding>
</runtime>
</configuration>
问题是每当启动时应用程序都会崩溃并显示以下消息：
=== Pre-bind state information === LOG: User = ... LOG: DisplayName = C,Version=2.0.0.0,PublicKeyToken=93a02044a09d059a (Fully-specified) LOG: Appbase = file:///D:/Temp/TheApp/bin/Debug/Test/ LOG: Initial PrivatePath = NULL Calling assembly : A,PublicKeyToken=null. === LOG: This bind starts in default load context. LOG: Using application configuration file: D:\Temp\TheApp\bin\Debug\Test\TheApp.exe.Config LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\machine.config. LOG: Post-policy reference: C,PublicKeyToken=93a02044a09d059a LOG: Attempting download of new URL file:///D:/Temp/TheApp/bin/Debug/Test/C.DLL. LOG: Attempting download of new URL file:///D:/Temp/TheApp/bin/Debug/Test/C/C.DLL. LOG: Attempting download of new URL file:///D:/Temp/TheApp/bin/Debug/Test/B/C.DLL. WRN: Comparing the assembly name resulted in the mismatch: Major Version ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated.
问题：为什么运行时仅查看“B”文件夹？为什么不继续在A文件夹中查找正确版本的共享程序集？
EDIT1：我添加了< codeBase>标签如下所述,我知道在我的配置文件中有以下内容：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<probing privatePath="B;A" />
</assemblyBinding>
<dependentAssembly>
<assemblyIdentity name="C" publicKeyToken="93a02044a09d059a" />
<codeBase version="1.0.0.0" href="B/C.dll"/>
<codeBase version="2.0.0.0" href="A/C.dll"/>
</dependentAssembly>
</runtime>
</configuration>
问题仍然存在！
解决方法
请参阅有关探测的
this MSDN页面上的注释,该注释直接解决了您的问题：
If you have multiple versions of an assembly in a directory and you want to reference a particular version of that assembly,you must use the
<codeBase>element instead of theprivatePathattribute of the<probing>element. If you use the<probing>element,the runtime stops probing the first time it finds an assembly that matches the simple assembly name referenced,whether it is a correct match or not. If it is a correct match,that assembly is used. If it is not a correct match,probing stops and binding fails.
运行时正在寻找2.0.0.0版本但找到1.0.0.0版本并停止查找.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<probing privatePath="B;A" />
<dependentAssembly>
<assemblyIdentity name="C" publicKeyToken="93a02044a09d059a" />
<codeBase version="1.0.0.0" href="B/C.dll"/>
<codeBase version="2.0.0.0" href="A/C.dll"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>