错误CS0234：类型或名称空间名称“持久性”在名称空间“ UnityEngine.XR.WSA”中不存在（您是否缺少程序集引用？）

Question

I'm currently developing an app for android. In my code, I use the namespace UnityEngine.XR.WSA.Persistence . When I'm launching the app on the editor, i have no errors, but when I try to build this to send it to my phone, I get the following one :

The type or namespace name "Persistence" does not exist in the namespace "UnityEngine.XR.WSA". Are you missing an assembly reference?"

Isn't it strange since it's working on the editor? How do i fix it?

Answer 1

WSA stands for Windows Store Apps . This is only available when building apps for Universal Windows Platform . Especially UnityEngine.XR.WSA.Persistence afaik is or at least was previously developed by Microsoft and is even only used in particular for the HoloLens .

It throws no exceptions in the Editor but afaik some #if preprocessors make sure that it also does nothing there.

---

It is not available when building an App for Android platforms.

To remove the error in your script you can use #if preprocessors and Platform dependent compilation like

#if UNITY_WSA
    // anything using the UnityEngine.XR.WSA namespace
#else
    // alternative implementation for different platform
#endif

however, the functionality ofcourse will not be available on Android so if you need something similar you have to use another library or come up with one ;)