使用 ASP.NET Core，您可以通过一种非常简单的方法为 Identity 模型指定所需的数据类型.

With ASP.NET Core, you have a very simple way to specify the data type you want for Identity's models.

第一步，覆盖 < 中的标识类字符串> 到 :

First step, override identity classes from < string> to < data type you want> :

public class ApplicationUser : IdentityUser<Guid>
{
}

public class ApplicationRole : IdentityRole<Guid>
{
}

声明你的数据库上下文，使用你的类和你想要的数据类型:

Declare your database context, using your classes and the data type you want :

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
            // Customize the ASP.NET Identity model and override the defaults if needed.
            // For example, you can rename the ASP.NET Identity table names and more.
            // Add your customizations after calling base.OnModelCreating(builder);
        }
    }

在您的启动类中，使用您的模型声明身份服务并声明主键所需的数据类型:

And in your startup class, declare the identity service using your models and declare the data type you want for the primary keys :

services.AddIdentity<ApplicationUser, ApplicationRole>()
            .AddEntityFrameworkStores<ApplicationDbContext, Guid>()
            .AddDefaultTokenProviders();