C# 1001 notes. Страница 3

int result = 1 + 2;

x = 10;
// = - operator
// x - left hand operand
// 10 - right hand operand

x = y + z;
// = - operator
// x - left hand operand
// (y + z) - right hand operand
// + - operator
// y - left hand operand
// z - right hand operand

bool isValid = true;
bool hasErrors = false;

ushort s1 = 0b1011_1100_1011_0011;
int x1 = 0x44aa_abcd;

public string this[string key] {
    get { return internalDictionary[key]; }
}

// Usage: something["x"]

public string this[params string[] keys] {
    get { return internalDictionary[key]; }
}

// Usage: something["x", "y", "z"]

var x = "y";
dynamic m = "n";
string t = nameof(x);

var var = "";
bool async = false;
string dynamic = "";
int get = 1;

class @class
{
    int @int;
    string @default;
}

string.Format("{0} is {1} yrs old.", name, age);

Console.Write("{0} is {1} yrs old.", name, age);

object[] args = { "London", 2017, 8825000 };
string res = string.Format("{0}'s population in {1} is {2:0,0}.", args);

London's population in 2017 is 8.825.000.

string name = "C# channel";
int age = 1;
string res = string.Format("{0} is {1} yrs old.", name, age);

// Output:
// C# channel is 1 yrs old.

decimal value = 123.456m;
Console.WriteLine("Your account balance is {0:C2}.", value);

// Output:
// Your account balance is $123.46.

Console.WriteLine("{0,-20} {1,5}\n", "Name", "Hours");

 void Main(string[] args)

 void Main(string[] args)
{
    // List all arguments
    foreach (string arg in args) {
        Console.Write(string.Format("Arg: {0}", arg));
    }
 
    // Use 1st argument as filename
    if (args.Length > 0) {
        string name = args[0];
        Console.Write(string.Format("File={0}", name));
    }
}

class Program
{
    static public void Main()
    {
        Console.WriteLine("This would compile..");
    }
}

class Program
{
    static int Main()
    {
        if (DateTime.Today.DayOfWeek == DayOfWeek.Monday)
            return -1; // Monday is bad
        else
            return 0;
    }
}

dotnet run
if ($LastExitCode -eq 0) {
    Write-Host "Execution succeeded"
} else
{
    Write-Host "Execution Failed"
}
Write-Host "Return value = " $LastExitCode