使用Enumerable和LINQ的另一个可选的内联解决方案是:

int number = 25;
    
string binary = Enumerable.Range(0, (int)Math.Log(number, 2) + 1).Aggregate(string.Empty, (collected, bitshifts) => ((number >> bitshifts) & 1 ) + collected);

如果你想要一个简洁的函数，你可以从你的主方法调用，在你的类中，这可能是有帮助的。如果你需要一个数字而不是字符串，你可能仍然需要调用int.Parse(toBinary(someint))，但我发现这个方法工作得很好。此外，如果您愿意，还可以调整为使用for循环而不是do-while循环。

    public static string toBinary(int base10)
    {
        string binary = "";
        do {
            binary = (base10 % 2) + binary;
            base10 /= 2;
        }
        while (base10 > 0);

        return binary;
    }

toBinary(10)返回字符串“1010”。

var b = Convert.ToString(i,2).PadLeft(32,'0').ToCharArray().Reverse().ToArray();

这个函数在c#中将整数转换为二进制:

public static string ToBinary(int N)
{
    int d = N;
    int q = -1;
    int r = -1;

    string binNumber = string.Empty;
    while (q != 1)
    {
        r = d % 2;
        q = d / 2;
        d = q;
        binNumber = r.ToString() + binNumber;
    }
    binNumber = q.ToString() + binNumber;
    return binNumber;
}

class Program{

   static void Main(string[] args){

      try{

     int i = (int)Convert.ToInt64(args[0]);
         Console.WriteLine("\n{0} converted to Binary is {1}\n",i,ToBinary(i));

      }catch(Exception e){

         Console.WriteLine("\n{0}\n",e.Message);

      }

   }//end Main


        public static string ToBinary(Int64 Decimal)
        {
            // Declare a few variables we're going to need
            Int64 BinaryHolder;
            char[] BinaryArray;
            string BinaryResult = "";

            while (Decimal > 0)
            {
                BinaryHolder = Decimal % 2;
                BinaryResult += BinaryHolder;
                Decimal = Decimal / 2;
            }

            // The algoritm gives us the binary number in reverse order (mirrored)
            // We store it in an array so that we can reverse it back to normal
            BinaryArray = BinaryResult.ToCharArray();
            Array.Reverse(BinaryArray);
            BinaryResult = new string(BinaryArray);

            return BinaryResult;
        }


}//end class Program

    // I use this function
    public static string ToBinary(long number)
    {
        string digit = Convert.ToString(number % 2);
        if (number >= 2)
        {
            long remaining = number / 2;
            string remainingString = ToBinary(remaining);
            return remainingString + digit;
        }
        return digit;
     }