C# 对象引用未设置为对象的实例-Black Jack游戏
我是一个编程新手,我正在制作一个Black Jack游戏,但我真的很难从我的洗牌牌组中向玩家的手中添加一张牌,当我调用C# 对象引用未设置为对象的实例-Black Jack游戏,c#,C#,我是一个编程新手,我正在制作一个Black Jack游戏,但我真的很难从我的洗牌牌组中向玩家的手中添加一张牌,当我调用Hit函数时,我得到以下消息: 对象引用未设置为对象的实例 我知道解决方案可能非常明显,但您能帮忙吗? 问题就在Deck类的底部,在Hit()函数中 /*主类*/ using System; using System.Collections.Generic; using System.Text; namespace BlackJackGameX { public cla
Hit
函数时,我得到以下消息:
对象引用未设置为对象的实例
我知道解决方案可能非常明显,但您能帮忙吗?问题就在
Deck
类的底部,在Hit()
函数中
/*主类*/
using System;
using System.Collections.Generic;
using System.Text;
namespace BlackJackGameX
{
public class MainClass
{
public static void Main (string[] args)
{
Deck cards = new Deck();
Hand playerHand = new Hand(cards);
Console.WriteLine("Welcome to Black Jack\n\nPress Enter To Start");
Console.ReadLine ();
cards.Hit();
playerHand.PrintHand();
}
}
}
/*卡片类*/
using System;
using System.Collections.Generic;
using System.Text;
namespace BlackJackGameX
{
public enum Suit {Spades, Hearts, Clubs, Diamonds}
public enum FaceValue {Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King}
public class Card
{
public Suit CardSuit;
public FaceValue CardValue;
public int iValue;
public Card (Suit cardSuit, FaceValue cardValue, int ivalue)
{
CardSuit = cardSuit;
CardValue = cardValue;
iValue = ivalue;
}
public Card ()
{
}
}
}
using System.Collections.Generic;
using System.Text;
namespace BlackJackGameX
{
public class Hand
{
public List<Card> PlayerHand;
private Deck cardDeck = new Deck();
public Hand (Deck Cards)
{
cardDeck = Cards;
}
public void PrintHand()
{
for (int i = 0; i < PlayerHand.Count; ++i)
{
Console.WriteLine("You have a " + PlayerHand[i].CardValue + " of " + PlayerHand[i].CardSuit);
if (i < PlayerHand.Count)
{
Console.WriteLine ("&");
}
}
Console.ReadLine();
}
}
}
/*手工课*/
using System;
using System.Collections.Generic;
using System.Text;
namespace BlackJackGameX
{
public enum Suit {Spades, Hearts, Clubs, Diamonds}
public enum FaceValue {Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King}
public class Card
{
public Suit CardSuit;
public FaceValue CardValue;
public int iValue;
public Card (Suit cardSuit, FaceValue cardValue, int ivalue)
{
CardSuit = cardSuit;
CardValue = cardValue;
iValue = ivalue;
}
public Card ()
{
}
}
}
using System.Collections.Generic;
using System.Text;
namespace BlackJackGameX
{
public class Hand
{
public List<Card> PlayerHand;
private Deck cardDeck = new Deck();
public Hand (Deck Cards)
{
cardDeck = Cards;
}
public void PrintHand()
{
for (int i = 0; i < PlayerHand.Count; ++i)
{
Console.WriteLine("You have a " + PlayerHand[i].CardValue + " of " + PlayerHand[i].CardSuit);
if (i < PlayerHand.Count)
{
Console.WriteLine ("&");
}
}
Console.ReadLine();
}
}
}
使用System.Collections.Generic;
使用系统文本;
命名空间BlackJackGameX
{
公务生
{
公开名单玩家;
私人甲板cardDeck=新甲板();
公众手牌(牌组卡)
{
卡片组=卡片;
}
公共空白打印手()
{
for(int i=0;i
/*甲板级*/
using System;
using System.Collections.Generic;
using System.Text;
namespace BlackJackGameX
{
public class Deck
{
Hand playerHand;
Random rNumber = new Random();
List<Card> Cards;
public int iValue1 = 11;
public int iValue2 = 2;
public int iValue3 = 3;
public int iValue4 = 4;
public int iValue5 = 5;
public int iValue6 = 6;
public int iValue7 = 7;
public int iValue8 = 8;
public int iValue9 = 9;
public int iValue10 = 10;
public int iValue11 = 10;
public int iValue12 = 10;
public int iValue13 = 10;
public Deck()
{
Cards = NewDeck();
}
private List<Card> NewDeck()
{
var AllSuits = new Suit[]
{
Suit.Spades,
Suit.Hearts,
Suit.Clubs,
Suit.Diamonds
};
var AllFaces = new FaceValue[]
{
FaceValue.Ace,
FaceValue.Two,
FaceValue.Three,
FaceValue.Four,
FaceValue.Five,
FaceValue.Six,
FaceValue.Seven,
FaceValue.Eight,
FaceValue.Nine,
FaceValue.Ten,
FaceValue.Jack,
FaceValue.Queen,
FaceValue.King
};
var AllValues = new int[]
{
iValue1,
iValue2,
iValue3,
iValue4,
iValue5,
iValue6,
iValue7,
iValue8,
iValue9,
iValue10,
iValue11,
iValue12,
iValue13
};
List<Card> myDeck = new List<Card>();
for (int i = 0; i <= 3; i++)
{
for (int j = 0; j <= 12; j++)
{
Card newCard = new Card(AllSuits[i], AllFaces[j], AllValues[j]);
myDeck.Add(newCard);
}
}
List<Card> shuffledDeck = new List<Card> ();
while (myDeck.Count > 0)
{
int c = myDeck.Count;
int n = rNumber.Next (0, c);
// var will translate into an int which will be used to pick the card needed from the list
var value = myDeck[n];
shuffledDeck.Add(value);
myDeck.Remove(value);
}
return shuffledDeck;
}
public void Print()
{
for (int i = 0; i <= 51; i++)
{
Console.WriteLine("You drew a " + (Cards [i].CardValue) + " of " + (Cards [i].CardSuit));
Console.ReadLine ();
}
}
public void Hit()
{
playerHand.PlayerHand.Add(Cards[0]);
Cards.Remove(Cards[0]);
/*var tmp = Cards[0];
Cards.Remove(tmp);
return tmp;*/
}
}
}
使用系统;
使用System.Collections.Generic;
使用系统文本;
命名空间BlackJackGameX
{
公务舱甲板
{
手拉手;
Random rNumber=新随机数();
名单卡;
公共int iValue1=11;
公共int iValue2=2;
公共int iValue3=3;
公共int iValue4=4;
公共int iValue5=5;
公共int iValue6=6;
公共int iValue7=7;
公共int iValue8=8;
公共int iValue9=9;
公共int iValue10=10;
公共int iValue11=10;
公共int iValue12=10;
公共int iValue13=10;
公共甲板()
{
Cards=NewDeck();
}
私有列表NewDeck()
{
var allsuites=新西装[]
{
西装,黑桃,
西服,红心,
西装,球杆,
西装,钻石
};
var AllFaces=new FaceValue[]
{
FaceValue.Ace,
FaceValue.2,
FaceValue.3,
FaceValue.4,
FaceValue.5,
FaceValue.6,
FaceValue.7,
FaceValue.8,
FaceValue.9,
FaceValue.10,
FaceValue,Jack,
FaceValue,女王,
FaceValue.King
};
var AllValues=new int[]
{
iValue1,
iValue2,
iValue3,
iValue4,
伊瓦鲁5,
iValue6,
伊瓦鲁7,
伊瓦鲁8,
伊瓦鲁9,
iValue10,
iValue11,
iValue12,
伊瓦鲁13
};
List myDeck=新列表();
对于您手上的(int i=0;i公共列表PlayerHand;
,
类从未分配给,并且始终为null
在Hit
中,调用playerHand.playerHand.Add
-playerHand.playerHand
为null
,因此调用Add
会导致null引用异常
通过抛出异常的函数进行调试应该可以清楚地显示这些问题-通过观察所使用的变量,您可以看到哪些变量具有预期值,哪些没有。看起来像Deck.playerHand从未初始化。Hand.playerHand也一样。您从未在Deck中设置playerHand,所以呢n您调用hit,playerHand为空。文件的哪一行触发了错误?playerHand
dead give away..您没有为该对象创建新的实例。.下次省去一些麻烦并调试@DJ KRAZE时,我很抱歉要问一些明显的问题,但我与Xamarin Studio的调试器不起作用,我我只做了5个星期的编程。在我试着了解基本知识的时候,恐怕你得耐心等待。谢谢你的帮助。@Jon-给它分配一些东西。如果手需要一张卡片列表,它从哪里得到的?不幸的是,我使用的是Xamarin Studio,没有工作的调试器。]:手需要拿汽车ds来自组。那么我该如何分配它呢?@JonDunn-你应该能够在手动
构造函数中完成它,在那里你将一个组
传入。我仍然无法确定要添加到手动构造函数中的内容,我添加的任何内容都会给我的代码带来进一步的问题。我想我可能承担了超出我能力范围的任务。可以吗你可能会在代码中告诉我我需要做什么,我真的很难看到解决方案。