十进制转二进制

一、最简单的方法：

int value=9;
string outString=Convert.ToString(9,2);

 

二，简单算法实现：

 

public static string ToBinaryString(int value)
        {           
            string outString = string.Empty;
            while (value > 0)
            {
                if (value % 2 == 0)
                {
                    value = value / 2;
                    outString += "0";
                }//end if
                else
                {
                    value = value / 2;
                    outString += "1";
                    
                }//end else
            }//end while

            string reverse = String.Empty;//逆转字符串
            for (int i = outString.Length - 1; i > -1; i--)
            {
                reverse += outString[i];
            }

            return reverse;
        }