asp.net 2.1 core razor如何在超链接加参数传输?

最近才学的razor,大佬们谁会做这个,我想在超连接带个“IsLogout=true”参数,

 <a asp-page="Index" class="btn-sm btn-warning">查看已注销</a>

让输出地址变为以下:
url/Purchase?IsLogout=true

全名是:
url/Purchase/index.html?IsLogout=true

 <a asp-page="Index" class="btn-sm btn-warning" href="url/Purchase/index.html?IsLogout=true">查看已注销</a>