在FM无线电频率上前进和后退

我已经设计了一个后退按钮和一个带xaml的前进按钮。 当我单击后退按钮时，我的FM收音机实例应根据信号强度开始寻找低于射频的射频。

Answer 1

嗨有代码可以做到这一点

private void FastForwardButton_Click(object sender, RoutedEventArgs e) { try { do { ManageFrequencyChange(0.1); } while (FMRadio.Instance.SignalStrength * 100 < 65); } catch (RadioDisabledException ex) { } } 

并赞赏这些

  private void ManageFrequencyChange(double delta) { try { do { double frequency = FMRadio.Instance.Frequency; frequency += delta; switch (wpradio.CurrentRegion) { case RadioRegion.Europe: if (frequency < minFrequencyEurope) frequency = maxFrequencyEurope; if (frequency > maxFrequencyEurope) frequency = minFrequencyEurope; break; case RadioRegion.Japan: if (frequency < minFrequencyJapan) frequency = maxFrequencyJapan; if (frequency > maxFrequencyJapan) frequency = minFrequencyJapan; break; case RadioRegion.UnitedStates: if (frequency < minFrequencyUnitedStates) frequency = maxFrequencyUnitedStates; if (frequency > maxFrequencyUnitedStates) frequency = minFrequencyUnitedStates; break; default: //Throw new ArgumentException(); break; } } while (!IsFrequencyCorrect(frequency)); wpradio.Frequency = Math.Round(frequency, 1); } catch { } } private bool IsFrequencyCorrect(double frequency) { string separator = CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator; bool isCorrect = false; string frequencyAsString = Math.Round(frequency, 1).ToString(); switch (wpradio.CurrentRegion) { case RadioRegion.Europe: isCorrect = frequencyAsString.EndsWith(string.Format("{0}1", separator)) || frequencyAsString.EndsWith(string.Format("{0}3", separator)) || frequencyAsString.EndsWith(string.Format("{0}5", separator)) || frequencyAsString.EndsWith(string.Format("{0}6", separator)) || frequencyAsString.EndsWith(string.Format("{0}7", separator)) || frequencyAsString.EndsWith(string.Format("{0}8", separator)) || frequencyAsString.EndsWith(string.Format("{0}0", separator)); break; case RadioRegion.Japan: //check here the correctness of frequency for this position isCorrect = frequencyAsString.EndsWith(string.Format("{0}1", separator)) || frequencyAsString.EndsWith(string.Format("{0}2", separator)) || frequencyAsString.EndsWith(string.Format("{0}3", separator)) || frequencyAsString.EndsWith(string.Format("{0}5", separator)) || frequencyAsString.EndsWith(string.Format("{0}6", separator)) || frequencyAsString.EndsWith(string.Format("{0}7", separator)) || frequencyAsString.EndsWith(string.Format("{0}8", separator)) || frequencyAsString.EndsWith(string.Format("{0}9", separator)) || frequencyAsString.EndsWith(string.Format("{0}0", separator)); break; case RadioRegion.UnitedStates: //check here the correctness of frequency for this position break; default: throw new ArgumentOutOfRangeException(); } return isCorrect; 

并在初始化之前定义最小和最大频率

  public partial class MainPage : PhoneApplicationPage { private const double minFrequencyEurope = 88; private const double maxFrequencyEurope = 108; private const double minFrequencyUnitedStates = 88.1; private const double maxFrequencyUnitedStates = 107.9; private const double minFrequencyJapan = 76; private const double maxFrequencyJapan = 90; public MainPage()