Iis6 simple random code example, iis6 code example

Iis6 simple random code example, iis6 code example
Solve the problem that the Random Code cannot be displayed on the win2003 iis6 Server

 

Display random code:

<% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "login. aspx. cs" Inherits = "TestDemo. login" %> <! DOCTYPE html> 
 



// Load the event
protected void Page_Load(object sender, EventArgs e)        {            if (!this.IsPostBack)            {                this.ViewState["GUID"] = System.Guid.NewGuid().ToString();                this.lblGUID.Text = this.ViewState["GUID"].ToString();            }        }
 
// Blank page with Random Code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Vcode.aspx.cs" Inherits="TestDemo.Vcode" %>
 
Background
Using System; using System. collections. generic; using System. drawing; using System. linq; using System. web; using System. web. UI; using System. web. UI. webControls; namespace TestDemo {public partial class Vcode: System. web. UI. page {protected void Page_Load (object sender, EventArgs e) {string checkCode = GetRandomCode (4); Session ["CheckCode"] = checkCode; SetPageNoCache (); CreateImage (checkCode );} /// <su Mmary> // set that the page is not cached /// </summary> private void SetPageNoCache () {Response. buffer = true; Response. expiresAbsolute = System. dateTime. now. addSeconds (-1); Response. expires = 0; Response. cacheControl = "no-cache"; Response. appendHeader ("Pragma", "No-Cache");} private string CreateRandomCode (int codeCount) {string allChar = ", A, B, c, D, E, F, G, H, I, J, K, M, N, P, Q, R, S, T, U, W, X, Y, Z "; string [] AllCharArray = allChar. split (','); string randomCode = ""; int temp =-1; Random rand = new Random (); for (int I = 0; I <codeCount; I ++) {if (temp! =-1) {rand = new Random (I * temp * (int) DateTime. now. ticks);} int t = rand. next (35); if (temp = t) {return CreateRandomCode (codeCount); // performance problem} temp = t; randomCode + = allCharArray [t];} return randomCode;} private string GetRandomCode (int CodeCount) {string allChar = ", A, B, C, D, E, F, G, h, I, J, K, M, N, P, Q, R, S, T, U, W, X, Y, Z "; string [] allCharArray = allChar. split (','); string Ran DomCode = ""; int temp =-1; Random rand = new Random (); for (int I = 0; I <CodeCount; I ++) {if (temp! =-1) {rand = new Random (temp * I * (int) DateTime. now. ticks);} int t = rand. next (33); while (temp = t) {t = rand. next (33) ;}temp = t; RandomCode + = allCharArray [t];} return RandomCode;} private void CreateImage (string checkCode) {int iwidth = (int) (checkCode. length * 14); System. drawing. bitmap image = new System. drawing. bitmap (iwidth, 20); Graphics g = Graphics. fromImage (image); Font f = new System. drawing. font ("Arial", 10); //, System. drawing. fontStyle. bold); Brush B = new System. drawing. solidBrush (Color. black); Brush r = new System. drawing. solidBrush (Color. fromArgb (166, 8, 8); // g. fillRectangle (new System. drawing. solidBrush (Color. blue), 0, 0, image. width, image. height); // g. clear (Color. aliceBlue); // background color g. clear (System. drawing. colorTranslator. fromHtml ("# 99C1CB"); // background color char [] ch = checkCode. toCharArray (); for (int I = 0; I <ch. length; I ++) {if (ch [I]> = '0' & ch [I] <= '9') {// The number is displayed in red. drawString (ch [I]. toString (), f, r, 3 + (I * 12), 3);} else {// The letter is displayed in black. drawString (ch [I]. toString (), f, B, 3 + (I * 12), 3 );}} // for Loop is used to generate some random horizontal lines // Pen blackPen = new Pen (Color. black, 0); // Random rand = new Random (); // for (int I = 0; I <5; I ++) // {// int y = rand. next (image. height); // g. drawLine (blackPen, 0, y, image. width, y); //} System. IO. memoryStream MS = new System. IO. memoryStream (); image. save (MS, System. drawing. imaging. imageFormat. jpeg); // history back does not repeat Response. cache. setNoStore (); // This sentence Response. clearContent (); Response. contentType = "image/Jpeg"; Response. binaryWrite (ms. toArray (); g. dispose (); image. dispose ();}}}