C# 简单传递参数问题

Question

我知道我现在听起来像个糟糕的程序员 - 但我是新手，我不知道如何使用这个引用的东西并传递参数，我的意思是我知道怎么做 - 但同时- 这不起作用，我不知道为什么。

static void Main(string[] args) {
  DealCard(ref card);
  Console.WriteLine();
  Console.ReadLine();
}

private static void DealCard(string card) {
  string finalNum = "";
  string finalSuite = "";
  bool diffCard = false;
  do {
    Random cardPicker = new Random();
    int cardSuite = cardPicker.Next(1, 5);
    if (cardSuite == 1) {
      finalSuite = "Hearts";
    } else if (cardSuite == 2) {
      finalSuite = "Spades";
    } else if (cardSuite == 3) {
      finalSuite = "Clubs";
    } else if (cardSuite == 4) {
      finalSuite = "Diamonds";
    }

    int cardNum = cardPicker.Next(1, 14);

    if (cardNum == 1) {
      finalNum = "Ace";
    } else if (cardNum == 2) {
      finalNum = "Two";
    } else if (cardNum == 3) {
      finalNum = "Thre";
    } else if (cardNum == 4) {
      finalNum = "Four";
    } else if (cardNum == 5) {
      finalNum = "Five";
    } else if (cardNum == 6) {
      finalNum = "Six";
    } else if (cardNum == 7) {
      finalNum = "Seven";
    } else if (cardNum == 8) {
      finalNum = "Eight";
    } else if (cardNum == 9) {
      finalNum = "Nine";
    } else if (cardNum == 10) {
      finalNum = "Ten";
    } else if (cardNum == 11) {
      finalNum = "Jack";
    } else if (cardNum == 12) {
      finalNum = "Queen";
    } else if (cardNum == 13) {
      finalNum = "King";
    }

    string newCard = finalNum + " of " + finalSuite;

    if (newCard != card) {
      card = finalNum + " of " + finalSuite;
      diffCard = true;
    } else {

    }
    card = newCard;

  } while (diffCard == false);
}

是的，我知道大量的“如果”令人眼花缭乱。 是的，我知道我可以在不到一半的时间内完成这项工作。 是的，我知道这是一个简单的问题。 是的，我知道我很糟糕，但我想谦虚地请求任何人帮助我停止为此脱发。

Answer 1

你必须像这样声明你的方法：

private static void DealCard(ref string card)

基本上该方法必须接受一个 ref 参数。

以下是支持答案的文档：

Value Type Parameters

Reference Type Parameters

Answer 2

你的代码可以是这样的

public class Program
{

  public static void Main(string[] args) {
  string card = "";
  DealCard(ref card);

}

private static void DealCard(ref string card) 
{
  string finalNum = "";
  string finalSuite = "";
  bool diffCard = false;
  do {
      Random cardPicker = new Random();
      int cardSuite = cardPicker.Next(1, 5);
      string[] suite =  new String[]{"Hearts","Spades", "Clubs", "Diaminds"};


      int cardNum = cardPicker.Next(1, 3);
      string[] numbers = new String[]{"one","two","three", "four"};



    string newCard = numbers[cardNum] + " of " + suite[cardSuite];

    if (newCard != card) {
      card = finalNum + " of " + finalSuite;
      diffCard = true;
    } else {

    }
    card = newCard;
      Console.WriteLine(newCard);


  } while (diffCard == false);
  }
}