无法在卸载时运行托管自定义操作

Question

我有一个应该在卸载时运行的自定义操作。但由于未知原因，msiexec说“此Windows Installer程序包存在问题。无法运行此安装所需的DLL。请联系您的支持人员或程序包供应商。”。代码如下：

<Binary SourceFile="SetupWiX.CA.dll" Id="Binary1"  />       
<CustomAction Id="DropDatabase" BinaryKey="Binary1" DllEntry="DropDatabase" Execute="deferred" Return="check"/>
<Custom Action='DropDatabase'  After="SetCustomActionDataValue_DropDatabase">Installed</Custom>

我在安装时运行的其他自定义操作很少，并且运行正常。除了条件之外，一切都是一样的。 那么如何才能正确地在卸载时运行自定义操作？ 我已经创建了一个空白的wix安装项目，以及一个在卸载时显示消息框的简单自定义操作，它工作正常。我不知道我的第一个自定义操作有什么问题。 我在安装和卸载时使用相同的DLL。 错误日志如下：

Action start 16:07:34: INSTALL.
Action start 16:07:34: ValidateProductID.
Action ended 16:07:34: ValidateProductID. Return value 1.
Action start 16:07:34: CostInitialize.
Action ended 16:07:34: CostInitialize. Return value 1.
Action start 16:07:34: FileCost.
Action ended 16:07:34: FileCost. Return value 1.
Action start 16:07:34: CostFinalize.
Action ended 16:07:34: CostFinalize. Return value 1.
Action start 16:07:34: InstallValidate.
Action ended 16:07:34: InstallValidate. Return value 1.
Action start 16:07:34: InstallInitialize.
Action ended 16:07:37: InstallInitialize. Return value 1.
Action start 16:07:37: ProcessComponents.
Action ended 16:07:37: ProcessComponents. Return value 1.
Action start 16:07:37: UnpublishFeatures.
Action ended 16:07:37: UnpublishFeatures. Return value 1.
Action start 16:07:37: RemoveFiles.
Action ended 16:07:37: RemoveFiles. Return value 0.
Action start 16:07:37: InstallFiles.
Action ended 16:07:37: InstallFiles. Return value 1.
Action start 16:07:37: DropDatabase.
Action ended 16:07:37: DropDatabase. Return value 1.
Action start 16:07:37: RegisterUser.
Action ended 16:07:37: RegisterUser. Return value 0.
Action start 16:07:37: RegisterProduct.
Action ended 16:07:37: RegisterProduct. Return value 1.
Action start 16:07:37: PublishFeatures.
Action ended 16:07:37: PublishFeatures. Return value 1.
Action start 16:07:37: PublishProduct.
Action ended 16:07:37: PublishProduct. Return value 1.
Action start 16:07:37: InstallFinalize.
CustomAction DropDatabase returned actual error code 1154 (note this may not be 100% accurate if translation happened inside sandbox)
MSI (s) (D4:DC) [16:07:41:650]: Product: MyProduct -- Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor.  Action DropDatabase, entry: DropDatabase, library: C:\Windows\Installer\MSI4DEF.tmp 

Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor.  Action DropDatabase, entry: DropDatabase, library: C:\Windows\Installer\MSI4DEF.tmp 
Action ended 16:07:41: InstallFinalize. Return value 3.
Action ended 16:07:42: INSTALL. Return value 3.

Answer 1

问题在于我的自定义操作方法是私有的，而不是公开的。