我正在阅读Head First C＃书，我被困在第一个实验室。我已经掌握了很多东西，但我已经遇到了一些障碍，我把头发拉了过来。
我似乎无法让myBet.GetDescription()中的Guy工作，即使看起来所有的部分都在那里。
当我点击比赛按钮时，就好像它被卡在无限循环中一样。几乎像raceTrackLength没有终点。
任何帮助都非常感谢。
这是我到目前为止的代码。
Greyhound.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
namespace WindowsFormsApplication6
{
class Greyhound
{
public int StartingPosition; //Where my picturebox starts
public int RaceTrackLength; //how long the racetrack is
public PictureBox myPictureBox = null; //my picturebox object
public int Location = 0; //My location on racetrack
public Random Randomizer; //instance of Random
public bool Run() //use randomizer like in the sub shop example
{
//Random Randomizer = new Random();
int randomMovement = Randomizer.Next(1, 4);
Point currentPos = myPictureBox.Location;
currentPos.X += randomMovement;
myPictureBox.Location = currentPos;
//Move forward either 1,2, 3, or 4 spaces at random
//update the position of my picture box on form
//return true if I won the race
if (currentPos.X >= RaceTrackLength)
{
return true;
}
else
return false;
}
public void TakeStartingPosition()
{
//reset location to the start line
myPictureBox.Left = StartingPosition;
Location = 0;
}
}
}
Guy.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication6
{
class Guy
{
public string name; //the guy's name
public Bet myBet = null; //an instance of Bet() that has his bet
public int cash; //how much cash he has
public RadioButton myRadioButton;
public Label myLabel;
public void UpdateLabels()
{
//set my label to my bet's description, and the label on my
// radio button to show my cash ('Joe has 43 bucks')
if (myBet == null)
{
myLabel.Text = name + " hasn't placed a bet";
}
else {
myLabel.Text = myBet.GetDescription();
//Why isn't this working??
}
myRadioButton.Text = name + " has " + cash + " bucks";
}
public void ClearBet()
{
//clear the betting table
myBet.amount = 0;
}
public bool PlaceBet(int amount, int Dog)
{
Bet myBet = new Bet();
myBet.Dog = Dog;
myBet.amount = amount;
myBet.Bettor = this;
UpdateLabels();
//place a new bet and store it in my bet field
//return true if the guy had enough money to bet
if (amount >= cash)
{
return false;
}
else
return true;
}
public void Collect(int Winner) {
cash += myBet.PayOut(Winner);
} //ask my bet to pay out
}
}
Bet.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace WindowsFormsApplication6
{
class Bet
{
public int amount; //amount of cash that was bet
public int Dog; //The number of the dog the bet is on
public Guy Bettor; //the guy who placed the bet
public string GetDescription()
{
//return a string that says who placed the bet, how much
//cash was bet, and which dog he bet on ("Joe bets 8 on
//dog #4"). If the amount is zero, no bet was placed
//("Joe hasn't placed a Bet.")
if (amount > 0)
{
return Bettor.name + " bets " + amount + "on dog #" + Dog;
}
else
return Bettor.name + " has not placed a bet!";
}
public int PayOut(int Winner)
{
//the parameter is the winner of the race. if the dog won,
//returns the amount bet. Otherwise, return the negative of
//the amount bet.
if (Dog == Winner)
{
return amount;
}
else
return -amount;
}
}
}
Form1.cs的
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication6
{
public partial class Form1 : Form
{
//initialize dog and guy arrays
Greyhound[] dogs = new Greyhound[4];
Guy[] guys = new Guy[3];
Random myRandom = new Random();
public Form1()
{
InitializeComponent();
//guys object initialization
guys[0] = new Guy()
{
cash = 50,
myLabel = joeBetLabel,
myRadioButton = joeRadioButton,
name = "Joe"
};
guys[1] = new Guy()
{
cash = 75,
myLabel = bobBetLabel,
myRadioButton = bobRadioButton,
name = "Bob"
};
guys[2] = new Guy()
{
cash = 45,
myLabel = alBetLabel,
myRadioButton = alRadioButton,
name = "Al",
};
for (int i = 0; i < guys.Length; i++)
{
guys[i].UpdateLabels();
}
//dogs object
dogs[0] = new Greyhound()
{
myPictureBox = dogPictureBox1,
StartingPosition = raceTrackPictureBox.Left,
RaceTrackLength = raceTrackPictureBox.Width - dogPictureBox1.Width,
Randomizer = myRandom
};
dogs[1] = new Greyhound()
{
myPictureBox = dogPictureBox2,
StartingPosition = raceTrackPictureBox.Left,
RaceTrackLength = raceTrackPictureBox.Width - dogPictureBox2.Width,
Randomizer = myRandom
};
dogs[2] = new Greyhound()
{
myPictureBox = dogPictureBox3,
StartingPosition = raceTrackPictureBox.Left,
RaceTrackLength = raceTrackPictureBox.Width - dogPictureBox3.Width,
Randomizer = myRandom
};
dogs[3] = new Greyhound()
{
myPictureBox = dogPictureBox4,
StartingPosition = raceTrackPictureBox.Left,
RaceTrackLength = raceTrackPictureBox.Width - dogPictureBox4.Width,
Randomizer = myRandom
};
}
private void betButton_Click(object sender, EventArgs e)
{
if (sender == alRadioButton)
{
if (!guys[2].PlaceBet((int)betNumericUpDown.Value, (int)dogNumericUpDown.Value))
{
//display message saying you can't bet that amount
MessageBox.Show("You can not bet this amount.", "Unable to bet amount");
}
}
else if (sender == joeRadioButton)
{
if (!guys[0].PlaceBet((int)betNumericUpDown.Value, (int)dogNumericUpDown.Value))
{
//display message saying you can't bet that amount
MessageBox.Show("You can not bet this amount.", "Unable to bet amount");
}
}
else if (sender == bobRadioButton)
{
if (!guys[1].PlaceBet((int)betNumericUpDown.Value, (int)dogNumericUpDown.Value))
{
//display message saying you can't bet that amount
MessageBox.Show("You can not bet this amount!", "Unable to bet amount");
}
}
for (int i = 0; i < guys.Length; i++)
{
guys[i].PlaceBet((int)betNumericUpDown.Value, (int)dogNumericUpDown.Value);
guys[i].UpdateLabels();
}
}
private void raceButton_Click(object sender, EventArgs e)
{
bool noWinner = true;
int dogWon;
while (noWinner)
{
for (int i = 0; i < dogs.Length; i++)
{
if (dogs[i].Run())
{
dogWon = i + 1;
}
}
}
}
private void joeRadioButton_CheckedChanged(object sender, EventArgs e)
{
label2.Text = guys[0].name;
}
private void bobRadioButton_CheckedChanged(object sender, EventArgs e)
{
label2.Text = guys[1].name;
}
private void alRadioButton_CheckedChanged(object sender, EventArgs e)
{
label2.Text = guys[2].name;
}
}
};
修改 我似乎已经在你的帮助下想出了这两个问题的解决方案，但是现在我似乎无法让竞赛停止。他们只是循环到起点，而不是仅仅结束比赛。我一直在玩它并在过去一小时内更换比赛按钮但没有成功。任何帮助？
private void raceButton_Click(object sender, EventArgs e)
{
bool noWinner = false;
int dogWon;
while (!noWinner)
{
Application.DoEvents();
for (int i = 0; i < dogs.Length; i++)
{
if (dogs[i].Run())
{
dogWon = i +1;
MessageBox.Show("The Winner is dog #" + dogWon, "Winner!");
for (int j = 0; j < dogs.Length; j++)
{
dogs[j].TakeStartingPosition();
}
}
}
}
}
答案 0 :(得分：2)
不确定问题1，但对于问题2，没有任何内容将noWinner设置为false，因此它将无限循环。