follow the "Start Up",but Error

[lianghongyi]

[lianghongyi]

I follow the "Start UP" in unpackaged app. after I install the nuget WinUI3XamlPreview，I added the code in picture。

there is error as "can't find WinUI3XamlPreview". I tried to include "WinUI3XamlPreview" by using code,but not working.
which namespace should I include?

[roxk]

Just as a troubleshooting step, can you confirm whether any files (winmd, dll) with WinUI3XamlPreview in the name is present in your output folder?

What's your WinUI 3 version?

Could you build the sample app in this repo successfully?

[LazyCuteLion]

I have the same problem,there have "WinUI3XamlPreview.dll"(but not winmd),I try to import the dll,but does not support.