class SomeObject  
{  
    public static bool operator ==(SomeObject left, object right)  
    {  
        if (right is null)  
        {  
            return true;  
        }  
  
        return false;  
    }  
    public static bool operator !=(SomeObject left, object right)  
    {  
        if (right is null)  
        {  
            return false;  
        }  
  
        return true;  
    }  
}

static void Main(string[] args)  
{  
    var isNullOperator = new SomeObject() == null;  
    var isNullIs = new SomeObject() is null;  
      
    Console.WriteLine($"Вывод через == : {isNullOperator}");  
    Console.WriteLine($"Вывод через is : {isNullIs}");  
}

Вывод через == : True
Вывод через is : False

SELECT 
   OBJECT_NAME(f.parent_object_id) TableName,
   COL_NAME(fc.parent_object_id,fc.parent_column_id) ColName
FROM 
   sys.foreign_keys AS f
INNER JOIN 
   sys.foreign_key_columns AS fc 
      ON f.OBJECT_ID = fc.constraint_object_id
INNER JOIN 
   sys.tables t 
      ON t.OBJECT_ID = fc.referenced_object_id
WHERE 
   OBJECT_NAME (f.referenced_object_id) = 'YourTableName'

var factory = new CancellationTokenSource();
var cancellationToken = factory.Token;
Console.CancelKeyPress += delegate { factory.Cancel(); };
// ...

SELECT conrelid::regclass AS table_from
     , conname
     , pg_get_constraintdef(oid)
FROM   pg_constraint
WHERE  contype IN ('f', 'p ')
AND    connamespace = 'public'::regnamespace  -- your schema here
ORDER  BY conrelid::regclass::text, contype DESC;

$ git describe master
v1.2.0-15-foobar123

$ git archive master --prefix='project/' | gzip > `git describe master`.tar.gz
v1.2.0-15-foobar123.tar.gz

$ git shortlog --no-merges master
Павлов Леонид (4):
Merged PR 8558: #6299 Проверка прав доступа при выполнении job
Merged PR 6958: #6289 Записывать и выдавать поле "Дата последнего изменения"
Merged PR 6956: #6192 Вынести логи с ошибками в отдельный файл
Merged PR 6941: #6166 Убрать поле TemplateId из метода GET

$ git shortlog --no-merges master --not v1.2.0
Павлов Леонид (2):
Merged PR 8558: #6299 Проверка прав доступа при выполнении job
Merged PR 6958: #6289 Записывать и выдавать поле "Дата последнего изменения"

public int[] Stack()
{
    var list = new Stack<int>(32);
    var remainder = digit;
    do
    {
        list.Push(remainder % 10);
        remainder /= 10;
    } while (remainder != 0);

    return list.ToArray();
}

public static int[] GetDigits(int n)
{
    if (n == 0)
        return new[] {0};
    
    var x = Math.Abs(n);

    var numDigits = NumberOfDigits(x);

    var res = new int[numDigits];
    var count = 0;

    while (x > 0)
    {
        res[count++] = x % 10;
        
        x /= 10;
    }
    
    Array.Reverse(res);

    return res;
}

public static int NumberOfDigits(int n)
{
    if (n >= 0)
    {
        if (n < 10) return 1;
        if (n < 100) return 2;
        if (n < 1000) return 3;
        if (n < 10000) return 4;
        if (n < 100000) return 5;
        if (n < 1000000) return 6;
        if (n < 10000000) return 7;
        if (n < 100000000) return 8;
        if (n < 1000000000) return 9;
        return 10;
    }
    else
    {
        if (n > -10) return 2;
        if (n > -100) return 3;
        if (n > -1000) return 4;
        if (n > -10000) return 5;
        if (n > -100000) return 6;
        if (n > -1000000) return 7;
        if (n > -10000000) return 8;
        if (n > -100000000) return 9;
        if (n > -1000000000) return 10;
        return 11;
    }
}

from itertools import combinations_with_replacement
A005188_list = []
for k in range(1, 10):
    a = [i**k for i in range(10)]
    for b in combinations_with_replacement(range(10), k):
        x = sum(map(lambda y:a[y], b))
        if x > 0 and tuple(int(d) for d in sorted(str(x))) == b:
            A005188_list.append(x)
A005188_list = sorted(A005188_list)

ThreadPool.QueueUserWorkItem(Work, null);

WaitCallback callback = new WaitCallback(Work);
ThreadPool.QueueUserWorkItem(callback, null);