问如何在Xamarin窗体中打开默认的电子邮件应用程序收件箱

EN

public interface IOpenManager
{
    void openMail();
}

[assembly: Dependency(typeof(OpenImplementation))]
namespace Demo.iOS
{
    public class OpenImplementation : IOpenManager
    {
        public void openMail()
        {
            NSUrl mailUrl = new NSUrl("message://");
            if (UIApplication.SharedApplication.CanOpenUrl(mailUrl))
            {
                UIApplication.SharedApplication.OpenUrl(mailUrl);
            }            
        }
    }
}

[assembly: Dependency(typeof(OpenImplementation))]
namespace Demo.Droid
{
    public class OpenImplementation : IOpenManager
    {
        public void openMail()
        {
            Intent intent = new Intent(Intent.ActionMain);
            intent.AddCategory(Intent.CategoryAppEmail);
            Android.App.Application.Context.StartActivity(intent);
        }
    }
}