讀檔

//ReadAllText
string text = System.IO.File.ReadAllText(@"C:\Users\Test\Sample.txt");
Console.Write(text);

//ReadAllLines
string[] lines = System.IO.File.ReadAllLines(@"C:\Users\Test\Sample.txt");
foreach (string line in lines)
{
	Console.WriteLine(line);
}
					

讀檔：StreamReader

System.IO.StreamReader file =   
    new System.IO.StreamReader(@"C:\Users\Test\Sample.txt");  
while((line = file.ReadLine()) != null)  
{  
    System.Console.WriteLine (line);
}  

file.Close(); 
					

寫檔

//WriteAllLines
string[] lines = { "First line", "Second line", "Third line"};
System.IO.File.WriteAllLines(@"C:\Users\Test\Sample2.txt", lines);

//WriteAllText
string text = "OwO";
System.IO.File.WriteAllText(@"C:\Users\Test\Sample3.txt", text);
					

寫檔：StreamWriter

string[] lines = {"First line", "Second line", "Third line"};

using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Test\Sample4.txt"))
{
	foreach (string line in lines)
	{
		file.WriteLine(line);
	}
}

//接在原檔內容下面的寫檔
using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Test\Sample5.txt", true))
{
	file.WriteLine("OwO");
}
					

如何代表角色？

• 使用數字
• 使用列舉

public enum Character
{
	Farmer = 1,
	Wolf = 2,
	Sheep = 3,
	Vegetable = 4
}
					

如何表示左岸、右岸及船上？

• 使用List
• List有Add、Remove、Count及Contains可以利用

List<Character> leftSide = new List<Character>();
List<Character> rightSide = new List<Character>();
List<Character> onBoat = new List<Character>();
					

如何判斷遊戲結束

• 檢查農夫、狼、羊和菜的位置
• 使用if判斷搭配Contains()

//檢查
if(leftSide.Contains(角色) && leftSide.Contains(不能在一起的角色))
{
	//遊戲結束
}
					

如何判斷是否能開船？

• 檢查農夫是否在船上
• 檢查船上角色數量

if(!onBoat.Contains(Farmer) || onBoat.Count > 2)
{
	//不可以開船
}
					

流程？

宣告＆初始化變數
while(!遊戲結束)
{
	顯示目前狀態
	使用者輸入
	防呆
	移動
	檢查移動結果
	清空畫面
}
顯示遊戲結果
					

宣告＆初始化變數

List<Character> leftSide = new List<Character>()
{
	Farmer, Wolf, Sheep, Vegetable
};
List<Character> rightSide = new List<Character>();
List<Character> onBoat = new List<Character>();
bool isGameOver = false;
bool isWin;
bool isBoatLeft = true;

int userInput;
					

顯示目前狀態

Console.Write("河岸左側：");
foreach(var character in leftSide)
{
	Console.Write("{0} ", character);
}
Console.Write("\n河岸右側：");
foreach(var character in rightSide)
{
	Console.Write("{0} ", character);
}
Console.Write("\n船上：");
foreach(var character in onBoat)
{
	Console.Write("{0} ", character);
}

if(isBoatLeft)
{
	Console.WriteLine("船目前停在：左岸");
}
else
{
	Console.WriteLine("船目前停在：右岸");
}
					

使用者輸入

Console.WriteLine("\n請輸入要移動的對象：");
Console.WriteLine("1. Farmer\n2. Wolf\n3. Sheep\n4. Vegetable.\n5. 開船");
int.TryParse(Console.ReadLine(), userInput);
					

防呆

while(userInput<1 || userInput>4)
{
	Console.Write("錯誤，請重新輸入：");
	int.TryParse(Console.ReadLine(), userInput);
}
					

移動

//開船
if(userInput == 5)
{
	//農夫在船上才能開船
	if(onBoat.Contains(Farmer))
	{
		isBoatLeft = !isBoatLeft;
	}
	else
	{
		Console.WriteLine("農夫不在船上，無法開船！");
	}
}
					

移動

//移動角色
else
{
	//角色在船上 => 移下船
	if(onBoat.Contains(userInput))
	{
		onBoat.Remove(userInput);
		if(isBoatLeft)
		{
			leftSide.Add(userInput);
		}
		else
		{
			rightSide.Add(userInput);
		}
	}
	//船和角色都在左邊 => 上船
	else if(isBoatLeft && leftSide.Contains(userInput))
	{
		leftSide.Remove(userInput);
		onBoat.Add(userInput);
	}
	//船和角色都在右邊 => 上船
	else if(!isBoatLeft && rightSide.Contains(userInput))
	{
		rightSide.Remove(userInput);
		onBoat.Add(userInput);
	}
	//船在對面，不能上船
	else
	{
		Console.WriteLine("船在對面，不能上船哦！");
	}
}
					

檢查移動結果

//開船就檢查兩岸
if(userInput == 5)
{
	//狼吃羊
	if(leftSide.Contains(Wolf) && leftSide.Contains(Sheep))
	{
		isGameOver = true;
		isWin = false;
		Console.WriteLine("糟糕，同在左岸的狼把羊吃掉了！");
	}
	if(rightSide.Contains(Wolf) && rightSide.Contains(Sheep))
	{
		isGameOver = true;
		isWin = false;
		Console.WriteLine("糟糕，同在右岸的狼把羊吃掉了！");
	}

	//羊吃菜
	if(leftSide.Contains(Sheep) && leftSide.Contains(Vegetable))
	{
		isGameOver = true;
		isWin = false;
		Console.WriteLine("糟糕，同在左岸的羊把菜吃掉了！");
	}
	if(rightSide.Contains(Sheep) && rightSide.Contains(Vegetable))
	{
		isGameOver = true;
		isWin = false;
		Console.WriteLine("糟糕，同在右岸的羊把菜吃掉了！");
	}
}
					

檢查移動結果

//檢查是否全到對岸
if(rightSide.Count == 4)
{
	isGameOver = true;
	isWin = true;
}
					

顯示遊戲結果

if(isWin)
{
	Console.WriteLine("You Win!");
}
else
{
	Console.WriteLine("You Lose!");
}