更改服务后，我收到错误Unable to resolve to ApplicationUser.cs for type 'Microsoft.AspNetCore.Identity.RoleManager`

// ApplicationUser.cs
namespace YourProject.Models
{
    public class ApplicationUser : IdentityUser
    {
        // 自定义属性和方法
    }
}

// Startup.cs 或 Program.cs
public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

    services.AddIdentity<ApplicationUser, IdentityRole>()
        .AddEntityFrameworkStores<ApplicationDbContext>()
        .AddDefaultTokenProviders();
}

// ApplicationDbContext.cs
namespace YourProject.Data
{
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser, IdentityRole, string>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }
    }
}

dotnet clean
dotnet build

YourProject/
├── Controllers/
├── Models/
│   ├── ApplicationUser.cs
│   └── ApplicationDbContext.cs
├── Data/
│   └── ApplicationDbContext.cs
├── Startup.cs
└── Program.cs

namespace YourProject.Models
{
    public class ApplicationUser : IdentityUser
    {
        // 自定义属性和方法
    }
}

namespace YourProject.Data
{
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser, IdentityRole, string>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }
    }
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

    services.AddIdentity<ApplicationUser, IdentityRole>()
        .AddEntityFrameworkStores<ApplicationDbContext>()
        .AddDefaultTokenProviders();
}