C#表达式

 

Category	Bits	Type	Range/Precision
Signed integral	8	sbyte	–128...127
	16	short	–32,768...32,767
	32	int	–2,147,483,648...2,147,483,647
	64	long	–9,223,372,036,854,775,808...9,223,372,036,854,775,807
Unsigned integral	8	byte	0...255
	16	ushort	0...65,535
	32	uint	0...4,294,967,295
	64	ulong	0...18,446,744,073,709,551,615
Floating point	32	float	1.5 × 10−45 to 3.4 × 1038, 7-digit precision
	64	double	5.0 × 10−324 to 1.7 × 10308, 15-digit precision
Decimal	128	decimal	1.0 × 10−28 to 7.9 × 1028, 28-digit precision

   

lock statement	class Account {     decimal balance;     public void Withdraw(decimal amount) {        lock (this) {            if (amount > balance) {               throw new Exception("Insufficient funds");            }            balance -= amount;        }     } }
using statement	static void Main() {     using (TextWriter w = File.CreateText("test.txt")) {        w.WriteLine("Line one");        w.WriteLine("Line two");        w.WriteLine("Line three");     } }

 

goto statement	static void Main(string[] args) {     int i = 0;     goto check;     loop:     Console.WriteLine(args[i++]);     check:     if (i < args.Length) goto loop; }
return statement	static int Add(int a, int b) {     return a + b; } static void Main() {     Console.WriteLine(Add(1, 2));     return; }
yield statement	static IEnumerable<int> Range(int from, int to) {     for (int i = from; i < to; i++) {        yield return i;     }     yield break; } static void Main() {     foreach (int x in Range(-10,10)) {        Console.WriteLine(x);     } }
throw and try statements	static double Divide(double x, double y) {     if (y == 0) throw new DivideByZeroException();     return x / y; } static void Main(string[] args) {     try {        if (args.Length != 2) {            throw new Exception("Two numbers required");        }        double x = double.Parse(args[0]);        double y = double.Parse(args[1]);        Console.WriteLine(Divide(x, y));     }     catch (Exception e) {        Console.WriteLine(e.Message);     }     finally {        Console.WriteLine(“Good bye!”);     } }
checked and unchecked statements	static void Main() {     int i = int.MaxValue;     checked {        Console.WriteLine(i + 1);       // Exception     }     unchecked {        Console.WriteLine(i + 1);       // Overflow     } }