ASP. NET MVC Authentication Code

Verification Code Class

namespaceQJW. verifycode{//Usage://Public Filecontentresult createvalidate ()//{    //Validatecode vcode = new Validatecode (); //String code = Vcode.createvalidatecode (5); //session["Validatecode"] = code; //byte[] bytes = vcode.createvalidategraphic (code); //return File (bytes, "Image/jpeg"); //}     Public classValidatecode { PublicValidatecode () {}/// <summary>        ///Maximum length of verification code/// </summary>         Public intMaxLength {Get{return Ten; } }        /// <summary>        ///Minimum length of verification code/// </summary>         Public intMinLength {Get{return 1; } }        /// <summary>        ///Generate verification Code/// </summary>        /// <param name= "Length" >Specify the length of the verification code</param>        /// <returns></returns>         Public stringCreatevalidatecode (intlength) {            int[] Randmembers =New int[length]; int[] Validatenums =New int[length]; stringValidatenumberstr =""; //generate a starting sequence value            intSeekseek =unchecked((int) DateTime.Now.Ticks); Random Seekrand=NewRandom (Seekseek); intBeginseek = (int) Seekrand.next (0, Int32.maxvalue-length *10000); int[] seeks =New int[length];  for(inti =0; i < length; i++) {Beginseek+=10000; Seeks[i]=Beginseek; }            //Generate random numbers             for(inti =0; i < length; i++) {Random rand=NewRandom (Seeks[i]); intPownum =1* (int) Math.pow (Ten, length); Randmembers[i]=Rand.            Next (Pownum, Int32.MaxValue); }            //extracting random numbers             for(inti =0; i < length; i++)            {                stringNumstr =Randmembers[i].                ToString (); intNumlength =numstr.length; Random Rand=NewRandom (); intNumposition = Rand. Next (0, Numlength-1); Validatenums[i]= Int32.Parse (numstr.substring (Numposition,1)); }            //Generate verification Code             for(inti =0; i < length; i++) {Validatenumberstr+=Validatenums[i].            ToString (); }            returnValidatenumberstr; }        /// <summary>        ///Create a picture of the verification code/// </summary>        /// <param name= "Containspage" >the Page object to output to</param>        /// <param name= "Validatenum" >Verification Code</param>         Public byte[] Createvalidategraphic (stringValidatecode) {Bitmap image=NewBitmap ((int) math.ceiling (Validatecode.length *12.0), A); Graphics g=graphics.fromimage (image); Try            {                //Generate random GeneratorsRandom random =NewRandom (); //clear the background color of the pictureg.clear (Color.White); //interference lines for drawing pictures                 for(inti =0; I < -; i++)                {                    intX1 =Random. Next (image.                    Width); intx2 =Random. Next (image.                    Width); intY1 =Random. Next (image.                    Height); inty2 =Random. Next (image.                    Height); G.drawline (NewPen (color.silver), x1, y1, x2, y2); } Font Font=NewFont ("Arial", A, (FontStyle.Bold |fontstyle.italic)); LinearGradientBrush Brush=NewLinearGradientBrush (NewRectangle (0,0, image. Width, image. Height), Color.Blue, color.darkred,1.2f,true); g.DrawString (Validatecode, font, brush,3,2); //foreground interference point of picture painting                 for(inti =0; I < -; i++)                {                    intx =Random. Next (image.                    Width); inty =Random. Next (image.                    Height); Image. SetPixel (x, Y, Color.FromArgb (random.                Next ())); }                //draw the border line of a pictureG.drawrectangle (NewPen (Color.silver),0,0, image. Width-1, image. Height-1); //Save picture DataMemoryStream stream =NewMemoryStream (); Image.                Save (stream, imageformat.jpeg); //Output Picture Stream                returnStream.            ToArray (); }            finally{g.dispose (); Image.            Dispose (); }        }        /// <summary>        ///get the length of the Verification code picture/// </summary>        /// <param name= "Validatenumlength" >the length of the verification code</param>        /// <returns></returns>         Public Static intGetimagewidth (intvalidatenumlength) {            return(int) (Validatenumlength *12.0); }        /// <summary>        ///get the height of the verification code/// </summary>        /// <returns></returns>         Public Static Doublegetimageheight () {return 22.5; }    }}

How to use

 public   Filecontentresult Createvalidate ( {Validatecode Vcode  = new   V            Alidatecode ();  string  code = vcode.createvalidatecode (            5  ); session[  validatecode   "] = code;  byte  [] bytes = return  File (bytes,  " image/jpeg   ); }

Html

<href= "javascript:;" onclick = "Reloadcode ();" ><  ID= "Safecode"  src= "/common/createvalidate"  alt= ""/></a>  

View JS

  
function Reloadcode () {        var verify = document.getElementById (' Safecode ');        Verify.setattribute (' src ', '/common/createvalidate ' + math.random ());    }

ASP. NET MVC Authentication Code