根据您的需要，Xamarin.Essentials提供了一种特殊的方法来获取您的设备信息。
1.下载Xamarin。Nuget中的必备软件。
1.使用var deviceName = DeviceInfo.Name;来取得。
有关详细信息，请参阅https://learn.microsoft.com/en-us/xamarin/essentials/device-information?tabs=ios

public class UserInformation : IUserInformation
    {
        /*  Caution: This method returns personal and sensitive user data.If your app accesses, collects, uses, or shares personal and sensitive data, 
         *  you must clearly disclose that fact to users. For apps published on Google Play, policies protecting user data require that you do the following:
         *  Disclose to the user how your app accesses, collects, uses, or shares personal and sensitive data. Learn more about acceptable disclosure and consent.
         * Provide a privacy policy that describes your use of this data on- and off-device.
         * To learn more, visit the Google Play Policy regarding user data. */

        public Task<string> GetUserName()
        {
            FormsAppCompatActivity activity = CrossCurrentActivity.Current.Activity as FormsAppCompatActivity;

            AccountManager manager = AccountManager.Get(activity);
            Account[] accounts = manager.GetAccounts();     // .GetAccountsByType("com.google");   "Type = "com.osp.app.signin" ?
            List<String> emails = new List<string>();

            foreach (Account account in accounts)
            {
                //var name = account.Name;
                emails.Add(account.Name);
            }

            // Should Loop until find one with "name"
            if (emails.Any() && emails[0] != null)
            {
                String email = emails[0];
                String[] parts = email.Split('@');

                if (parts.Length > 1)
                {
                   return Task.FromResult(parts[0]);
                }
            }

            return Task.FromResult("");
        }
    }