如何在Windows Phone中将值解析为字符串？

Question

如何将此双精度格式的值（距离，卡路里）解析为字符串格式？ 它们在textBlock中。 需要将它们转换为按钮clickevent中的字符串。

private void PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
        {            
            var coord = new GeoCoordinate(e.Position.Location.Latitude, e.Position.Location.Longitude);
     var calories = caloriesLabel.Text;
                var previousPoint = _line.Path.Last();
                var distance = coord.GetDistanceTo(previousPoint);
                var millisPerKilometer = (1000.0 / distance) * (System.Environment.TickCount - _previousPositionChangeTick);
                _kilometres += distance / 1000.0;               
                paceLabel.Text = TimeSpan.FromMilliseconds(millisPerKilometer).ToString(@"mm\:ss");
                distanceLabel.Text = string.Format("{0:f2} km", _kilometres);
                caloriesLabel.Text = string.Format("{0:f0}", _kilometres * 65);
}

Answer 1

您可以使用例如

double d = 13.000;
string.Format("{0:0.000}km", d)

或者，您可以将format参数传递给ToString方法。

string s = d.ToString("0.000 km");
Console.WriteLine(s);

如果未将“ 0.000”作为参数传递，则仅显示13。希望有帮助

Answer 2

处理此问题的最佳方法是进行tryparse。

String Dist, Cals;

bool distParsed = Double.TryParse(distance,out Dist);
bool calsParsed = Double.TryParse(calories,out Cals);

if(!distParsed||!calseParsed)
{
  String message = !distParsed ? "Distance failed to parse" : "";
  if(message.Trim().Length==0)
    message = !calsParsed ? "Calories failed to parse" : "";
  MessageBox.Show(message);
}