如何从nsuserdefaults .plist配置文件Xamarin forms获取键/值

var userDefaults = NSUserDefaults.StandardUserDefaults;

var value = userDefaults.StringForKey("key");

var sharedPreferences = PreferenceManager.GetDefaultSharedPreferences(Android.App.Application.Context);

var value = sharedPreferences.GetString("key", defaultValue);

public interface IConfigService
{
    string GetValue(string key);
}

[assembly: Dependency(typeof(ConfigService))]
public class ConfigService : IConfigService
{
    public string GetValue(string key)
    {
        var userDefaults = NSUserDefaults.StandardUserDefaults;
        return userDefaults.StringForKey(key);
    }
}

[assembly: Dependency(typeof(ConfigService))]
public class ConfigService : IConfigService
{
    public string GetValue(string key)
    {
        var sharedPreferences = PreferenceManager.GetDefaultSharedPreferences(Android.App.Application.Context);
        return sharedPreferences.GetString(key, null);
    }
}

var configService = DependencyService.Get<IConfigService>();
var value = configService.GetValue("key");