在新建asp.net core 应用后， 添加了自定义的ApplicationDbContext 和ApplicationUser ,并添加了Identity认证后， 会出现 InvalidOperationException: Unable to resolve service for type ‘Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]‘ 错误。需要把相关网页上注入的UserManager<IdentityUser> 改为UserManager<ApplicationUser> .
InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]'
原文地址：https://www.cnblogs.com/leon-ytparty/p/10118894.html