asp.net-core – 如何在EF Core 2.1.0中为Admin用户播种？

.NET Core 2.1中的种子角色使用ApplicationDbContext类中给出的代码：

protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        // 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);

        modelBuilder.Entity<IdentityRole>().HasData(new IdentityRole { Name = "Admin",NormalizedName = "Admin".ToUpper() });
    }

具有角色的种子用户按照以下步骤操作.

第1步：创建新类

public static class ApplicationDbInitializer
{
    public static void SeedUsers(UserManager<IdentityUser> userManager)
    {
        if (userManager.FindByEmailAsync("abc@xyz.com").Result==null)
        {
            IdentityUser user = new IdentityUser
            {
                UserName = "abc@xyz.com",Email = "abc@xyz.com"
            };

            IdentityResult result = userManager.CreateAsync(user,"PasswordHere").Result;

            if (result.Succeeded)
            {
                userManager.AddToRoleAsync(user,"Admin").Wait();
            }
        }       
    }   
}

步骤2：现在修改Startup.cs类中的ConfigureServices方法.

修改前：

services.AddDefaultIdentity<IdentityUser>()
            .AddEntityFrameworkStores<ApplicationDbContext>();

修改后：

services.AddDefaultIdentity<IdentityUser>().AddRoles<IdentityRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>();

步骤3：修改Startup.cs类中Configure Method的参数.

修改前：

public void Configure(IApplicationBuilder app,IHostingEnvironment env)
    {
        //..........
    }

修改后：

public void Configure(IApplicationBuilder app,IHostingEnvironment env,UserManager<IdentityUser> userManager)
    {
        //..........
    }

第4步：调用Seed(ApplicationDbInitializer)类的方法：

ApplicationDbInitializer.SeedUsers(userManager);