Question

下面是我的种子班。

   public static class DataInitializer
    {
        public static async void SeedRolesAsync(RoleManager<Role> roleManager)
        {
            if (roleManager.RoleExistsAsync("Administrator").Result)
                return;

            var role = new Role
            {
                Name = "Administrator",
                Description = "Perform all the operations."
            };
            await roleManager.CreateAsync(role);


        }

        public static async void SeedRoleClaimsAsync(RoleManager<Role> roleManager)
        {



            var role = await roleManager.FindByNameAsync("Administrator");


            var roleClaims = await roleManager.GetClaimsAsync(role);

            foreach (var claimString in AllClaims.GetList())
            {
                var newClaim = new Claim(claimString, "");
                if (!roleClaims.Any(rc => rc.Type.ToString() == claimString))
                {
                    await roleManager.AddClaimAsync(role, newClaim);
                }
            }
        }

        public static async void SeedUsersAsync(UserManager<User> userManager)
        {
            var user = new User
            {
                UserName = "admin@example.com",
                Email = "admin@example.com",
                FirstName = "Admin",
                LastName = "User",
                Enabled = true
            };
            var result = await userManager.CreateAsync(user, "Admin@123");
            if (result.Succeeded)
            {
                await userManager.AddToRoleAsync(user, "Administrator");
            }
        }

        public static void SeedData(UserManager<User> userManager, RoleManager<Role> roleManager)
        {
            SeedRolesAsync(roleManager);
            SeedRoleClaimsAsync(roleManager);
            SeedUsersAsync(userManager);
        }
    }

在启动类DataInitializer.SeedData(userManager, roleManager);中调用此方法

播种时，我得到的错误低于错误。.我正在使用ef core 3进行Postgresql ..我得到

System.ObjectDisposedException：'无法访问已处置的对象。对象名称：“ MyUserManager”。

Answer 1

尝试完全使用任务-如果您不退回任何东西等待机会，即使尚未完成，代码仍将继续处理。

public static async Task SeedData(UserManager<User> userManager, RoleManager<Role> roleManager)
{
    await SeedRolesAsync(roleManager);
    await SeedRoleClaimsAsync(roleManager);
    await SeedUsersAsync(userManager);
}

public static async Task SeedRolesAsync(RoleManager<Role> roleManager)
{
    ⋮
}

public static async Task SeedRoleClaimsAsync(RoleManager<Role> roleManager)
{
    ⋮
}

public static async Task SeedUsersAsync(UserManager<User> userManager)
{
    ⋮
}

您也可以将此调用移至Main的{{1}}方法中，因为可以将该方法设为Program.cs。

async

在ef core播种数据时出现错误

1 个答案: