如何在 Wix 中安装和卸载期间访问会话自定义操作数据（属性）？

Question

你能告诉我下面的代码有什么问题吗？我可以在安装过程中访问自定义操作数据，并将它们的值添加到会话自定义操作集合中。但是，在卸载期间，值对不在集合中。

public class CustomActions
{
    //This action is only called during application install
    [CustomAction]
    public static ActionResult CreateToolbar(Session session)       
    {
        //This works fine the value is properly sent from wix script
        //The variable toolbarName has the expected value
        string toolbarName = session["VSTOCustomAction_ToolbarName"];

        //Save the value for uninstaller
        session.CustomActionData.Add("VSTOCustomAction_ToolbarName", toolbarName);
        ...
    }

    //This action is only called during application uninstall
    [CustomAction]
    public static ActionResult RemoveToolbar(Session session)
    {
        //Get the toolbar name and remove it
        //Why does the following call return null?
        string toolbarName = session.CustomActionData["VSTOCustomAction_ToolbarName"];          
        ...
    }
}

Below is the WIX part that calls the above custom action.

<!-- Include the VSTO Custom action  -->
<Binary Id="VSTOCustomAction" SourceFile="CustomAction.CA.dll"/>
<CustomAction Id="CreateToolbar" BinaryKey="VSTOCustomAction" DllEntry="CreateToolbar" Execute="immediate"/>
<CustomAction Id="RemoveToolbar" BinaryKey="VSTOCustomAction" DllEntry="RemoveToolbar" Execute="immediate"/>
...
<CustomAction Id="PropertyAssign_ToolbarName" Property="VSTOCustomAction_ToolbarName" Value="MyToolBarName"/>
...
<!-- Modify the install sequence to call our custom action -->
<InstallExecuteSequence>
  <Custom Action="PropertyAssign_ToolbarName" Before="CreateToolbar"><![CDATA[(&ToolbarComponent = 3) AND NOT (!ToolbarComponent = 3)]]></Custom>
  <Custom Action="CreateToolbar" After="InstallFinalize"><![CDATA[(&ToolbarComponent = 3) AND NOT (!ToolbarComponent = 3)]]></Custom>
  <Custom Action="RemoveToolbar" After="InstallFinalize"><![CDATA[(&ToolbarComponent = 2) AND NOT (!ToolbarComponent = 2)]]></Custom>
</InstallExecuteSequence>   

Answer 1

安装后 MSI 不会保留属性。阅读以下内容以获得良好的解决方案。

“WiX 工具集的‘记住属性’模式。”
http://robmensching.com/博客/帖子/2010/5/2/The-WiX-toolsets-Remember-Property-pattern

Answer 2

看来您只是在安装 ToolbarComponent 时创建 VSTOCustomAction_ToolbarName 属性，因此当您尝试卸载时，永远不会创建或设置 VSTOCustomAction_ToolbarName 属性。

解决此问题的一种方法是将工具栏名称保存在 Windows 注册表项上，而不是创建属性来包含此值，以便您可以在尝试卸载产品时读取它。