首先，我是C＃的新手，我需要一些帮助。我是一个包含列表的类。我可以从应用程序中设置列表中的项目，但不能从类中设置项目（需要在哪里完成）。我也需要将一个活动转移到课堂上。这也适用于应用程序。非常感谢任何帮助。以下是我班上的代码：
namespace CarRace
{
class Cars
{
public string Name { get; set; }
public int StartPOS { get; set; }
public int Speed { get; set; }
public int CurPOS { get; set; }
public double Location { get; set; }
public Cars(string Name, int StartPOS, int Speed, int CurPOS, long Location)
{
this.Name = Name;
this.StartPOS = StartPOS;
this.Speed = Speed;
this.CurPOS = 0;
this.Location = 0;
}
public static int CompareCurrentLocation(Cars c1, Cars c2)
{
return c2.Location.CompareTo(c1.Location);
}
}
}
我需要将它添加到课程中：
if (File.Exists("NewRace.xml"))
{
XDocument doc = XDocument.Load("NewRace.xml");
var nCars = doc.Descendants("Car").Select(x => new Cars("", 0, 0, 0, 0)
{
Name = x.Attribute("Name").Value,
StartPOS = int.Parse(x.Attribute("StartPOS").Value),
Speed = int.Parse(x.Attribute("Speed").Value),
CurPOS = 0
});
}
而且：
int p = 1;
int prevPOS = 1;
DateTime? PrevTime;
double dist = 0;
double PrevLoc = 0;
if (i == 0)
{
return;
}
foreach (var car in RaceList)
{
dist = (((car.Speed * 1609.344) * 1) / 1609.344) / 3600;
car.Location = car.Location + dist;
}
Comparison<Cars> compLoc = Cars.CompareCurrentLocation;
RaceList.Sort(compLoc);
PrevTime = DateTime.Now;
foreach (var car in RaceList)
{
if (car.Location != PrevLoc)
{
car.CurPOS = p;
}
else
{
car.CurPOS = prevPOS;
}
prevPOS = car.CurPOS;
PrevLoc = car.Location;
p++;
}
由于
答案 0 :(得分：1)
感谢您的所有回复。我尝试了car.speed / 3600但只得到了 因为我做了很长的路。我确实让一切都运转了 我需要的方式。
那是因为你正在进行整数除法（car.Speed的类型为int），所以结果的小数部分被丢弃。由于汽车的速度小于3600，因此总是会导致零。您可以先将car.Speed转换为double来避免这种情况 - 这应该会产生您想要的结果：
dist = (double)car.Speed / 3600;
答案 1 :(得分：0)
感谢您的所有回复。我尝试了car.speed / 3600，但只能回到0，所以我做了很长的路。我确实按照我需要的方式工作。我是这方面的新手，非常感谢任何提示。以下是我更新过的代码。
namespace CarRace
{
class Cars
{
public string Name { get; set; }
public int StartPOS { get; set; }
public int CurPOS { get; set; }
public int Speed { get; set; }
public double Location { get; set; }
public string Make { get; set; }
private static List<Cars> CarList;
private static string ProgPart;
public Cars(string Name, int StartPOS, int CurPOS, int Speed, double Location, string Make)
{
this.Name = Name;
this.StartPOS = StartPOS;
this.CurPOS = CurPOS;
this.Speed = Speed;
this.Location = Location;
this.Make = Make;
}
public static List<Cars> FillList()
{
return CarList;
}
public static void Main()
{
try
{
bool Prog = false;
//Get Part to display
while (!Prog)
{
Console.WriteLine("Select the part you would like to test.(1 or 2)");
ProgPart = Console.ReadLine();
if (ProgPart == "1" || ProgPart == "2")
{
Prog = true;
}
}
Console.WriteLine("----------------------------------------");
//Read XML File and set the CarList
if (File.Exists("NewRace.xml"))
{
XDocument doc = XDocument.Load("NewRace.xml");
var nCars = doc.Descendants("Car").Select(x => new Cars("", 0, 0, 0, 0, "")
{
Name = x.Attribute("Name").Value,
StartPOS = int.Parse(x.Element("StartPOS").Value),
CurPOS = 0,
Speed = int.Parse(x.Element("Speed").Value),
Location = double.Parse(x.Element("Location").Value),
Make = x.Attribute("Make").Value
});
CarList = new List<Cars>();
foreach (var car1 in nCars)
{
if (ProgPart == "1")
{
CarList.Add(new Cars(car1.Name, car1.StartPOS, car1.CurPOS, car1.Speed, car1.Location, car1.Make));
}
else
{
CarList.Add(new Cars(car1.Name, car1.StartPOS, car1.CurPOS, 0, car1.Location, car1.Make));
}
}
}
else
{
Console.WriteLine("File Not Found!");
Console.ReadKey();
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
public static int CompareCurrentLocation(Cars c1, Cars c2)
{
return c2.Location.CompareTo(c1.Location);
}
public static Boolean UpdateLeaderBoard(long i)
{
try
{
int p = 1;
int prevPOS = 1;
DateTime? PrevTime;
double dist = 0;
double prevLocation = 0;
if (i == 0)
{
return false;
}
foreach (var car in CarList)
{
if (ProgPart == "2")
{
switch (car.Make)
{
case "300ZX":
//Slow continuous gain of speed by percentage after 60 with top speed of 320.
if (i <= 15)
{
car.Speed = car.Speed + (60 / 10);
}
else if (car.Speed < 320)
{
double percent = (double)(car.Speed * .1);
if ((Convert.ToInt32(car.Speed + percent)) > 320)
{
car.Speed = 320;
}
else
{
car.Speed = Convert.ToInt32(car.Speed + (percent));
}
}
break;
case "Camero":
//0-60 4 seconds 60-220 20 seconds Top 220
if (i <= 4)
{
car.Speed = car.Speed + (60 / 4);
}
else if (i <= 20)
{
car.Speed = car.Speed + 10;
}
break;
case "Mustang":
//0-top(210) 25 seconds
if (car.Speed <= 200)
{
car.Speed = car.Speed + (200 / 20);
}
break;
case "VW Bug":
//Constant Speed
car.Speed = 165;
break;
default:
Console.WriteLine("Make not found");
break;
}
}
//Set Cars Current Location
dist = (((car.Speed * 1609.344) * 1) / 1609.344) / 3600;
car.Location = car.Location + dist;
}
//Sort list by location
Comparison<Cars> compLoc = Cars.CompareCurrentLocation;
CarList.Sort(compLoc);
PrevTime = DateTime.Now;
//Set the Current Position
foreach (var car in CarList)
{
if (car.Location != prevLocation)
{
car.CurPOS = p;
}
else
{
car.CurPOS = prevPOS;
}
prevPOS = car.CurPOS;
prevLocation = car.Location;
p++;
}
return true;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return false;
}
}
}
}