Question

使用ASP.NET Core 2.

我正在尝试初始化一些应用程序范围的数据。为此，我创建了一个名为DbInitializer的新类，一个名为IDbInitializer的接口，并在AddScoped中使用Startup.ConfigureServices进行了注册。

然后从Startup.Configure开始，我致电DbInitializer.Initialize()并在该方法内部拨打UserManager一些电话：

if (appDbContext.Roles.All(i => i.Name != adminGroupName))
{
    await roleManager.CreateAsync(new IdentityRole(adminGroupName));
};
var role = appDbContext.Roles.First(i => i.Name == adminGroupName);

if (appDbContext.Users.All(i => i.UserName != adminSettings.Username))
{
    await userManager.CreateAsync(new ApplicationUser { UserName = adminSettings.Username,
                                                        Email = adminSettings.Username,
                                                        FirstName = adminSettings.FirstName,
                                                        LastName = adminSettings.LastName,
                                                        EmailConfirmed = true }, adminSettings.Password);
}
var adminUser = appDbContext.Users.First(i => i.UserName == adminSettings.Username);

if (!appDbContext.UserRoles.Any(i => i.RoleId == role.Id && i.UserId == adminUser.Id))
{
    await userManager.AddToRoleAsync(adminUser, role.Name);
}

问题是我随机获得了异常

无法访问已处置的对象

来自userManager.CreateAsync或userManager.AddToRoleAsync。

Answer 1

我认为问题在于DbInitializer.Initialize()方法调用（应标记为async并返回Task）未正确等待，因为Startup.Configure方法必须归还无效。如果您将呼叫更改为等待任务完成的DbInitializer.Initialize().Wait()，它应该有效。

UserManager - 访问处置对象

1 个答案: