我有一个 MVC 应用程序，它部署到在 Windows Server 2012 虚拟机上运行的 Windows Azure 托管服务。在该web.config文件中，我有 3 个部分使用PKCS12ProtectedConfigurationProvider: connectionStrings、dataCacheClients和system.net/mailSettings/smtp. 以下是相关部分的样子：
<configuration>
...
<configProtectedData>
<providers>
<add name="CustomProvider" thumbprint="[this is secret]"
type="Pkcs12ProtectedConfigurationProvider.Pkcs12ProtectedConfigurationProvider, PKCS12ProtectedConfigurationProvider, Version=1.0.0.0, Culture=neutral, PublicKeyToken=34da007ac91f901d" />
</providers>
</configProtectedData>
...
<connectionStrings configProtectionProvider="CustomProvider">
<EncryptedData ... ommitted for brevity
</connectionStrings>
...
<system.net>
<mailSettings>
<smtp configProtectionProvider="CustomProvider">
<EncryptedData ommitted for brevity
</smtp>
</mailSettings>
</system.net>
...
<dataCacheClients configProtectionProvider="CustomProvider">
<EncryptedData ommitted for brevity
</dataCacheClients>
...
</configuration>
以上所有工作都很好。部署到 Azure 时，连接字符串、SMTP 邮件和数据缓存都可以正常工作。提供PKCS12ProtectedConfiguration者使用我的自定义证书来解密这些部分，一切都很好。
但是我似乎不能使用相同的方法来加密web.config/appSettings。当我尝试将以下内容部署到 Azure 时...
<configuration>
...
<appSettings configProtectionProvider="CustomProvider">
<EncryptedData ommitted for brevity
</appSettings>
...
</configuration>
...然后我得到以下异常：
Server Error in '/' Application.
Configuration Error
Description: An error occurred during the processing of a configuration file
required to service this request. Please review the specific error details
below and modify your configuration file appropriately.
Parser Error Message: An error occurred loading a configuration file: Could not
load file or assembly 'PKCS12ProtectedConfigurationProvider, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=34da007ac91f901d' or one of its dependencies.
The system cannot find the file specified.
Source Error:
Line 41: </EncryptedData>
Line 42: </connectionStrings>
Line 43: <appSettings configProtectionProvider="CustomProvider">
Line 44: <EncryptedData ...>
Line 45: <EncryptionMethod .../>
Source File: E:\sitesroot\0\web.config Line: 43
Assembly Load Trace: The following information can be helpful to determine why
the assembly 'PKCS12ProtectedConfigurationProvider, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=34da007ac91f901d' could not be loaded.
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value
[HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure
logging.
To turn this feature off, remove the registry value
[HKLM\Software\Microsoft\Fusion!EnableLog].
但是我知道PKCS12ProtectedConfigurationProvider.dll它在/bin文件夹中，因为：
- 我远程进入虚拟机并在两者中都看到了
approot/bin它siteroot/bin - 当我使用未加密的版本进行部署时
appSettings，其他 3 个部分已使用此 dll 成功解密。
就好像程序集加载器PKCS12ProtectedConfigurationProvider.dll在解析并加载该appSettings部分之前无法查找该文件。我尝试省略提供程序配置部分的版本、文化和 PublicKeyToken 部分，但随后错误变为：
Parser Error Message: An error occurred loading a configuration file: Could not
load file or assembly 'PKCS12ProtectedConfigurationProvider' or one of its
dependencies. The system cannot find the file specified.
部署到在 Windows Server 2012 虚拟机上运行的 Windows Azure 托管服务时，是否可以web.config/appSettings使用自定义进行加密？configProtectionProvider如果是这样，我在这里错过了什么？
更新：
发布此消息后，我打开了Fusion!EnableLog注册表项，现在我在异常中获得了以下附加信息：
Assembly Load Trace: The following information can be helpful to determine why
the assembly 'PKCS12ProtectedConfigurationProvider, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=34da007ac91f901d' could not be loaded.
=== Pre-bind state information ===
LOG: User = NT AUTHORITY\NETWORK SERVICE
LOG: DisplayName = PKCS12ProtectedConfigurationProvider, Version=1.0.0.0, Culture=neutral, PublicKeyToken=34da007ac91f901d
(Fully-specified)
LOG: Appbase = file:///d:/windows/system32/inetsrv/
LOG: Initial PrivatePath = NULL
Calling assembly : (Unknown).
===
LOG: This bind starts in default load context.
LOG: No application configuration file found.
LOG: Using host configuration file: D:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet.config
LOG: Using machine configuration file from D:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config.
LOG: Post-policy reference: PKCS12ProtectedConfigurationProvider, Version=1.0.0.0, Culture=neutral, PublicKeyToken=34da007ac91f901d
LOG: Attempting download of new URL file:///d:/windows/system32/inetsrv/PKCS12ProtectedConfigurationProvider.DLL.
LOG: Attempting download of new URL file:///d:/windows/system32/inetsrv/PKCS12ProtectedConfigurationProvider/PKCS12ProtectedConfigurationProvider.DLL.
LOG: Attempting download of new URL file:///d:/windows/system32/inetsrv/PKCS12ProtectedConfigurationProvider.EXE.
LOG: Attempting download of new URL file:///d:/windows/system32/inetsrv/PKCS12ProtectedConfigurationProvider/PKCS12ProtectedConfigurationProvider.EXE.
所以这里有另一个问题：为什么 IIS 会在inetsrv这个程序集的路径中查找，而不是在应用程序的/bin文件夹中查找它？我在日志中看到“未找到应用程序配置文件”。这是否意味着程序集绑定器必须找到一个web.config未加密的appSettings部分才能解析和加载它？