我遇到了这种错误的错误＆＃34;类型＆＃39; System.ArgumentNullException＆＃39;的第一次机会异常。发生在PresentationFramework.dll＆＃34;
好的，这是我的代码：
DispatcherTimer timer;
int count = 1;
bool ball1visibility = true;
bool ball2visibility = true;
bool ball3visibility = true;
bool ball4visibility = true;
bool ball5visibility = true;
bool gameover = false;
int score1 = 0;
int score2 = 0;
int overallscore1 = 0;
int overallscore2 = 0;
public void militimer_Tick(object sender, EventArgs e)
{
TimeSpan result = TimeSpan.FromMilliseconds(count++);
if (Game != null)
{
DetectScoring();
}
}
public void ShowGame(Game game)
{
if (Game == null)
{
Game = game;
arenaContainer.Content = game;
Game.SetGameLoop(gameLoop);
}
}
public void Window_Loaded(object sender, RoutedEventArgs e)
{
Game game = new PlayGame();
ShowGame(game);
gameLoop.Start();
}
void DetectScoring()
{
if (Game != null && arenaContainer.Content != null && gameover == false)
{
PlayGame sg = (PlayGame)Game; //class that calls the objects of the game
var topball1 = Canvas.GetTop(sg.ellipseBall1);
var leftball1 = Canvas.GetLeft(sg.ellipseBall1);
Rect ball1rect = new Rect(leftball1, topball1, 18, 18); //basically the balls that should be inside the pocket in order to get points
var topball2 = Canvas.GetTop(sg.ellipseBall2);
var leftball2 = Canvas.GetLeft(sg.ellipseBall2);
Rect ball2rect = new Rect(leftball2, topball2, 18, 18);
var topball3 = Canvas.GetTop(sg.ellipseBall3);
var leftball3 = Canvas.GetLeft(sg.ellipseBall3);
Rect ball3rect = new Rect(leftball3, topball3, 18, 18);
var topball4 = Canvas.GetTop(sg.ellipseBall4);
var leftball4 = Canvas.GetLeft(sg.ellipseBall4);
Rect ball4rect = new Rect(leftball4, topball4, 18, 18);
var topball5 = Canvas.GetTop(sg.ellipseBall5);
var leftball5 = Canvas.GetLeft(sg.ellipseBall5);
Rect ball5rect = new Rect(leftball5, topball5, 18, 18);
// player 1 goal/ Player 2 gains points here
topLeft.RadiusX = 25 / 2;
topLeft.RadiusY = 25 / 2;
Rect h1rect = topLeft.Bounds; // pocket hole 1
botLeft.RadiusX = 25 / 2;
botLeft.RadiusY = 25 / 2;
Rect h2rect = botLeft.Bounds; // pocket hole 2
//vice versa
topRight.RadiusX = 25 / 2;
topRight.RadiusY = 25 / 2;
Rect h3rect = topRight.Bounds; // pocket hole 3
botRight.RadiusX = 25 / 2;
botRight.RadiusY = 25 / 2;
Rect h4rect = botRight.Bounds; // pocket hole 4
//check intersection of pocket with the balls
if (ball1rect.IntersectsWith(h1rect) || ball1rect.IntersectsWith(h2rect))
{
if (ball1visibility == true)
{
// Player1Score.Content = "Player 2 score:" + score2;
Game.RemoveVisual(sg.ellipseBall1);
ball1visibility = false;
Console.WriteLine("Player 2 scores ball1");
score2 += 1;
}
}
else if (ball1rect.IntersectsWith(h3rect) || ball1rect.IntersectsWith(h4rect))
{
if (ball1visibility == true)
{
// Player2Score.Content = "Player 1 scores";
Game.RemoveVisual(sg.ellipseBall1);
ball1visibility = false;
score1++;
}
}
if (ball2rect.IntersectsWith(h1rect) || ball2rect.IntersectsWith(h2rect))
{
if (ball2visibility == true)
{
// Player1Score.Content = "Player 2 scores";
Game.RemoveVisual(sg.ellipseBall2);
ball2visibility = false;
score2++;
}
}
else if (ball2rect.IntersectsWith(h3rect) || ball2rect.IntersectsWith(h4rect))
{
if (ball2visibility == true)
{
// Player2Score.Content = "Player 1 scores";
Game.RemoveVisual(sg.ellipseBall2);
ball2visibility = false;
score1++;
}
}
if (ball3rect.IntersectsWith(h1rect) || ball3rect.IntersectsWith(h2rect))
{
if (ball3visibility == true)
{
// Player1Score.Content = "Player 2 scores";
Game.RemoveVisual(sg.ellipseBall3);
ball3visibility = false;
score2++;
}
}
else if (ball3rect.IntersectsWith(h3rect) || ball3rect.IntersectsWith(h4rect))
{
if (ball3visibility == true)
{
// Player2Score.Content = "Player 1 scores";
Game.RemoveVisual(sg.ellipseBall3);
ball3visibility = false;
score1++;
}
}
if (ball4rect.IntersectsWith(h1rect) || ball4rect.IntersectsWith(h2rect))
{
if (ball4visibility == true)
{
// Player1Score.Content = "Player 2 scores";
Game.RemoveVisual(sg.ellipseBall4);
ball4visibility = false;
score2++;
}
}
else if (ball4rect.IntersectsWith(h3rect) || ball4rect.IntersectsWith(h4rect))
{
if (ball4visibility == true)
{
// Player2Score.Content = "Player 1 scores";
Game.RemoveVisual(sg.ellipseBall4);
ball4visibility = false;
score1++;
}
}
if (ball5rect.IntersectsWith(h1rect) || ball5rect.IntersectsWith(h2rect))
{
if (ball5visibility == true)
{
// Player1Score.Content = "Player 2 scores";
Game.RemoveVisual(sg.ellipseBall5);
ball5visibility = false;
score2++;
}
}
else if (ball5rect.IntersectsWith(h3rect) || ball5rect.IntersectsWith(h4rect))
{
if (ball5visibility == true)
{
// Player2Score.Content = "Player 1 scores";
Game.RemoveVisual(sg.ellipseBall5);
ball5visibility = false;
score1++;
}
}
}
// after the 5 balls are inside the pocket it will count total score
if (score1 + score2 == 5 && gameover == false)
{
Console.WriteLine("Calculating Score");
Scoring(score1, score2);
}
lbScore1a.Content = score1.ToString();
lbScore2a.Content = score2.ToString();
lbScore1.Content = overallscore1.ToString() + " - ";
lbScore2.Content = overallscore2.ToString() + " - ";
}
// *************** part where I suspect the problem is ******************
public void Scoring(int player1score, int player2score)
{
player1score = score1;
player2score = score2;
Console.WriteLine("Score is " + (score1 + score2));
if (score1 > score2 && gameover == false)
{
gameover = true;
timer.Stop();
militimer.Stop();
gameLoop.Stop();
MessageBoxResult result = MessageBox.Show("Player 1 wins", "Win", MessageBoxButton.OK);
if (result == MessageBoxResult.OK)
{
count = 0;
timer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
timer.Start();
militimer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
militimer.Tick += new EventHandler(militimer_Tick);
militimer.Start();
gameover = false;
Game = null;
arenaContainer.Content = null;
Game game = new PlayGame();
ShowGame(game);
gameLoop.Start();
score1 = 0;
score2 = 0;
ball1visibility = true;
ball2visibility = true;
ball3visibility = true;
ball4visibility = true;
ball5visibility = true;
Console.WriteLine("Game restarting 1");
}
overallscore1++;
}
else if (score1 < score2 && gameover == false)
{
gameover = true;
timer.Stop();
militimer.Stop();
gameLoop.Stop();
MessageBoxResult result = MessageBox.Show("Player 2 wins", "Win", MessageBoxButton.OK);
if (result == MessageBoxResult.OK)
{
count = 0;
timer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
timer.Start();
militimer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
militimer.Tick += new EventHandler(militimer_Tick);
militimer.Start();
gameover = false;
Game = null;
arenaContainer.Content = null;
Game game = new PlayGame();
ShowGame(game);
gameLoop.Start();
score1 = 0;
score2 = 0;
ball1visibility = true;
ball2visibility = true;
ball3visibility = true;
ball4visibility = true;
ball5visibility = true;
Console.WriteLine("Game restarting 2");
}
overallscore2++;
}
}
使用当前writeline调试的输出是：
Calculating Score
Score is 5
Game restarting 2
Calculating Score
Score is 5
A first chance exception of type 'System.ArgumentNullException' occurred in PresentationFramework.dll
Game restarting 1
游戏应该做的是，如果所有5个球都在里面。它会立即开始另一轮，并且还会增加任何一名球员赢得前一轮的总分。我不确定错误。有时候我有时会跑7轮，最少2轮。如果你认为我给你的代码仍然不够，你想看到其他类。让我知道所以我可以发布它。我还放了一个＆＃34; ****＆＃34;我认为哪种方法导致问题。我知道这篇文章很长，但提前感谢您的帮助。
我认为问题出在哪里：
** // *************** part where I suspect the problem is ******************
public void Scoring(int player1score, int player2score)
{
player1score = score1;
player2score = score2;
Console.WriteLine("Score is " + (score1 + score2));
if (score1 > score2 && gameover == false)
{
gameover = true;
timer.Stop();
militimer.Stop();
gameLoop.Stop();
MessageBoxResult result = MessageBox.Show("Player 1 wins", "Win", MessageBoxButton.OK);
if (result == MessageBoxResult.OK)
{
count = 0;
timer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
timer.Start();
militimer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
militimer.Tick += new EventHandler(militimer_Tick);
militimer.Start();
gameover = false;
Game = null;
arenaContainer.Content = null;
Game game = new PlayGame();
ShowGame(game);
gameLoop.Start();
score1 = 0;
score2 = 0;
ball1visibility = true;
ball2visibility = true;
ball3visibility = true;
ball4visibility = true;
ball5visibility = true;
Console.WriteLine("Game restarting 1");
}
overallscore1++;
}
else if (score1 < score2 && gameover == false)
{
gameover = true;
timer.Stop();
militimer.Stop();
gameLoop.Stop();
MessageBoxResult result = MessageBox.Show("Player 2 wins", "Win", MessageBoxButton.OK);
if (result == MessageBoxResult.OK)
{
count = 0;
timer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
timer.Start();
militimer.Interval = TimeSpan.FromMilliseconds(Convert.ToDouble(1));
militimer.Tick += new EventHandler(militimer_Tick);
militimer.Start();
gameover = false;
Game = null;
arenaContainer.Content = null;
Game game = new PlayGame();
ShowGame(game);
gameLoop.Start();
score1 = 0;
score2 = 0;
ball1visibility = true;
ball2visibility = true;
ball3visibility = true;
ball4visibility = true;
ball5visibility = true;
Console.WriteLine("Game restarting 2");
}
overallscore2++;
}
}**
答案 0 :(得分：1)
我看到的是，每次开始新一轮时，你都会向millitimer添加一个事件。 这样，在几轮之后，您可以同时触发多个事件，而不是一个。
如果发生勾号并且事件处理程序跳转到DetectScore，那么这也是一个问题
if (Game != null && arenaContainer.Content != null && gameover == false)
如果在
之间触发，则将解析为truegameover = false;
Game = null;
您应该使用
删除活动militimer.Tick -= new EventHandler(militimer_Tick);
重置所有游戏状态，例如gameover和stuff 然后开始时间
militimer.Tick += new EventHandler(militimer_Tick);
militimer.Start();
那应该可以解决问题。