某些小技巧的技术分享

分享1:

需求:输入十进制数x,要求输出三十六进制数y,要求y至少是两位数,如:x=0,1…9,10,y=00,01…09,0z;

         分析:

                 string[] chars = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };

         int vl = (int)value;(注:vl为整数,vl/36是取整)

         string temp = "";

         if (vl < (36 * 36))//count = 2

             temp = chars[vl / 36] + chars[vl % 36];

         else if (vl < (36 * 36 * 36))//count = 3

             temp = chars[vl / (36 * 36)] + chars[(vl / 36) % 36] + chars[vl % 36];

         else if (vl < (36 * 36 * 36 * 36))//count = 4

             temp = chars[vl / (36 * 36 * 36)] + chars[(vl / (36 * 36)) % 36] + chars[(vl / 36) % 36] + chars[vl % 36];

         else if (vl < (36 * 36 * 36 * 36 * 36))//count = 5

             temp = chars[vl / (36 * 36 * 36 * 36)] + chars[(vl / (36 * 36 * 36)) % 36]+ chars[(vl / (36 * 36)) % 36] + chars[(vl / 36) % 36] + chars[vl % 36];

         .......依次类推

根据上面的规律,我们可以使用一个while循环进行实现:

int n=vl;

         int count =1;//记录位数+1

         while (true)

         {

                   if ((n = n / 36) < 36)//计算周期内的位数,直到n的值在0~36内(不包含36)

                   {

                            temp = chars[vl / (int)(Math.Pow(36, count))];//最左边位数值

                            for (int i = count - 1; i > -1; i--)

                                     temp += chars[(vl / (int)(Math.Pow(36, i))) % 36];//从左向右追加位数值

                            break;

                   }

                   count++;

         }

最后,temp就是所需的结果。(语言:C#)

 

分享2:

         需求:在winForm中,需要对TextBox输入框进行水印提示;

         分析:对TextBox进行重写操作:

         public partial class WatermarkTextBox : TextBox

    {

        private const uint ECM_FIRST = 0x1500;

        private const uint EM_SETCUEBANNER = ECM_FIRST + 1;

 

        public WatermarkTextBox()

        {

            InitializeComponent();

        }

        [DllImport("user32.dll",CharSet = CharSet.Auto,SetLastError = false)]

        static extern IntPtr SendMessage(IntPtr hWnd, uint Msg ,uint wParam,string lParam);

        private string watermarkText;

        [Description("文本提示")]

        public string WatermarkText

        {

            get { return watermarkText; }

            set

            {

                watermarkText = value;

                SetWatermark(watermarkText);

            }

        }

        private void SetWatermark(string watermarkText)

        {

            SendMessage(this.Handle, EM_SETCUEBANNER, 0, watermarkText);

        }

}

对此重写方法编译后,我们在设计界面的属性框中就可以找到WatermarkText,直接填写值,使用的WatermarkTextBox控件,就可以看到水印提示了。

原文地址:https://www.cnblogs.com/ysq0908/p/9382980.html