初回公開用のサンプルコードを追加

Author: tanaka-takayoshi

CSharp CheatSeet/10-1 Indexer.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var my = new MyClass();
+	my[1] = 100;
+	my[1].Dump();
+	my["test"].Dump();
+}
+
+public class MyClass
+{
+	private int[] array = new int[100];
+	private Dictionary<string, int> dict = new Dictionary<string, int>();
+     
+	public int this[int i]
+	{
+		get
+		{
+			return array[i];
+		}
+		set
+		{
+			array[i] = value;
+		}
+	}
+	
+	public int this[string s] => dict.ContainsKey(s) ? dict[s] : 0;
+}

CSharp CheatSeet/11-1 UserDefinedOperator.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var c1 = new Complex(1, 3) + new Complex(2, 4); // 3 + 7i
+	c1.Dump();
+	
+	var c2 = -new Complex(2, -2); //-2+2i
+	c2.Dump();
+}
+
+public class Complex
+{
+	public double Real { get; }
+	public double Imaginary { get; }
+
+	public Complex(double real, double imaginary)
+	{
+		Real = real;
+		Imaginary = imaginary;
+	}
+
+	public static Complex operator -(Complex c1)
+	{
+		return new Complex(-c1.Real, -c1.Imaginary);
+	}
+	
+	public static Complex operator +(Complex c1, Complex c2)
+	{
+		return new Complex(c1.Real + c2.Real, c1.Imaginary + c2.Imaginary);
+	}
+}

CSharp CheatSeet/12-1 InstanceConstructor.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var my1 = new MyClass();
+	//0
+	my1.Value.Dump();
+
+	var my2 = new MyClass(2);
+	//2
+	my2.Value.Dump();
+}
+
+public class MyClass
+{
+	public int Value { get; set; }
+	
+	public MyClass() : this(0)
+	{}
+
+	public MyClass(int v)
+	{
+		Value = v;
+	}
+	
+}
+
+//singletonパターンなど、コンストラクタ呼び出しを公開したくない場合はprivateにできる
+public class MyClass2
+{
+	public static MyClass2 Instance = new MyClass2();
+
+	private MyClass2()
+	{}
+}

CSharp CheatSeet/12-2 StaticConstructor.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var my = new MyClass();
+	//5
+	my.Value.Dump();
+}
+
+public class MyClass
+{
+	static int DefaultValue;
+	static MyClass()
+	{
+		//代入するだけであればフィールドの初期化子として書けるが
+		//より複雑な初期化も可能
+		DefaultValue = 5;
+	}
+
+	public int Value { get; set; } = DefaultValue;
+}

CSharp CheatSeet/12-3 Destructor.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var my = new MyClass();
+	my = null;
+	GC.Collect();
+	GC.WaitForPendingFinalizers(); // Destruct
+}
+
+public class MyClass
+{
+	// デストラクター
+	~MyClass()
+	{
+		Console.WriteLine("Destruct");
+	}
+}

CSharp CheatSeet/13-1 Struct.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var p1 = new Point(10);
+	//参照ではなく、コピーした値がp2に割り当てられる
+	var p2 = p1;
+	//p1のプロパティを更新してもp2には影響がない
+	p1.X = 1;
+	p1.Dump(); //p1.X=1
+	p2.Dump(); //p2.X=10
+
+	//構造体をデフォルト値はnullではない
+	var points = new Point[10];
+	//point[0].X=0
+	points[0].Dump();
+}
+
+struct Point
+{
+	private int x;
+	public int X
+	{
+		get { return x; }
+		set { x = value; }
+	}
+	public Point(int x)
+	{
+		this.x = x;
+	}
+}

CSharp CheatSeet/14-1 Inheritance.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var my = new MyClass1();
+	my.Test2(); //MyClass1.Test2
+
+	var my2 = new MyClass2();
+	my2.Test2(); //1
+}
+
+public class MyBase
+{
+	public int Value { get; set; } = 0;
+
+	public void Test1()
+	{
+		Console.WriteLine("MyBase.Test1");
+	}
+
+	public virtual void Test2()
+	{
+		Console.WriteLine("MyBase.Test2");
+	}
+}
+
+public class MyClass1 : MyBase
+{
+	public new int Value { get; set; } = 1;
+
+	public override void Test2()
+	{
+		Console.WriteLine("MyClass1.Test2");
+	}
+}
+
+public class MyClass2 : MyClass1
+{
+	public override void Test2()
+	{
+		Console.WriteLine(Value);
+	}
+}

CSharp CheatSeet/14-2 Abstract.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var my = new MyClass();
+	my.Test1(); // MyAbstractClass.Test1
+	my.Test2(); // MyClass.Test2
+	my.Test3(); // MyClass.Test3
+
+	var my2 = new MyClass2();
+	my2.Test1(); // MyAbstractClass.Test1
+	my2.Test2(); // MyClass2.Test2
+	my2.Test3(); // MyClass.Test3
+}
+
+public abstract class MyAbstractClass
+{
+	public void Test1()
+	{
+		Console.WriteLine("MyAbstractClass.Test1");
+	}
+	
+	public abstract void Test2();
+	
+	public abstract void Test3();
+}
+
+public class MyClass : MyAbstractClass
+{
+	public override void Test2()
+	{
+		Console.WriteLine("MyClass.Test2");
+	}
+
+	public sealed override void Test3()
+	{
+		Console.WriteLine("MyClass.Test3");
+	}
+}
+
+public sealed class MyClass2 : MyClass
+{
+	public override void Test2()
+	{
+		Console.WriteLine("MyClass2.Test2");
+	}
+}

CSharp CheatSeet/14-3 Interface.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var s1 = new Surface();
+	s1.Name = "a";
+	s1.Paint(); // Paint
+	((ISurface)s1).Paint(); // Paint
+	((IPaintable)s1).Paint(); // Paint
+
+	var s2 = new Surface2();
+	s2.Paint(); // Paint
+	((ISurface)s2).Paint(); // Paint
+	((IPaintable)s2).Paint(); // IPaintable.Paint
+}
+
+interface IPaintable
+{
+	void Paint();
+}
+
+interface ISurface
+{
+	string Name { get; set; }
+	void Paint();
+}
+
+public class Surface : ISurface, IPaintable
+{
+	public string Name { get; set; }
+	public void Paint()
+	{
+		Console.WriteLine("Paint");
+	}
+}
+
+public class Surface2 : ISurface, IPaintable
+{
+	public string Name { get; set; }
+	public void Paint()
+	{
+		Console.WriteLine("Paint");
+	}
+
+	void IPaintable.Paint()
+	{
+		Console.WriteLine("IPaintable.Paint");
+	}
+}

CSharp CheatSeet/15-1 Enum.linq

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+<Query Kind="Program" />
+
+void Main()
+{
+	var t1 = Color.Red;
+	t1.Dump();
+
+	var t2 = Color.Blue;
+	t2.Dump();
+	
+	//定義されていない値をキャストすることが可能だが、非推奨
+	var t3 = (LongType)23;
+	t3.Dump();
+}
+
+public enum Color
+{
+	Red,
+	Blue,
+	Orange
+}
+
+public enum LongType : long
+{
+	Solid = int.MaxValue + 1L,
+	Soft = 1,
+	Hard = Solid
+}