增加以下特性即可[PackageRegistration(UseManagedResourcesOnly = true, AllowsBackgroundLoading = true)][ProvideAutoLoad(UICONTEXT.CSharpProject_string, PackageAutoLoadFlags.BackgroundLoad)][ProvideAutoLoad(UICONTEXT.VBProject_string, PackageAutoLoadFlags.BackgroundLoad)][ProvideAutoLoad(UICONTEXT.FSharpProject_string, PackageAutoLoadFlags.BackgroundLoad)]
官方文档
https://docs.microsoft.com/zh-cn/visualstudio/extensibility/loading-vspackages?view=vs-2019
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