问题-:
如何让验证码呈现在lable1中;
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing.Drawing2D;
using System.Drawing;
public partial class reigster : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
CreateCheckCodeImage(rndnum(4));
} } protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{ }private string rndnum(int vcodenum)
{ string vnum = null; string vchar="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"+"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";
//对字符串进行切割;
string[] mysqlit = vchar.Split(','); Random num = new Random(); //随机抽取4个字符 ;
for (int i = 0; i < 4; i++)
{ int numNext = num.Next(mysqlit.Length); vnum+=mysqlit[numNext];
} return vnum; }
private void CreateCheckCodeImage(string checkCode)
{ if (checkCode == null || checkCode.Trim() == String.Empty) return; //建立一个位图文件 确立长宽 System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22); Graphics g = Graphics.FromImage(image); try
{ //生成随机生成器 Random random = new Random(); //清空图片背景色 g.Clear(Color.White); //画图片的背景噪音点 for (int i = 0; i < 60; i++)
{ int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } //把产生的随机数以字体的形式写入画面 Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic)); System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(checkCode, font, brush, 2, 2); //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(ms.ToArray());
} finally
{
g.Dispose();
image.Dispose(); } }
}
刚学asp.net好多问题不懂?
但Label一定要显示图片也是可以的,如:
Label1.Text = "<img alt='验证码' src='images.jpg' />";
http://blog.csdn.net/polarissky/archive/2010/01/05/5135461.aspx
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;public partial class 创建随机验证码图片_CreateCheckCodeImage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty; System.Random random = new Random(); for (int i = 0; i < 4; i++)
{
number = random.Next(); if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26)); checkCode += code.ToString();
} Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode;
} private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image); try
{
//生成随机生成器
Random random = new Random(); //清空图片背景色
g.Clear(Color.White); //画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
} Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2); ////画图片的前景噪音点
//for(int i=0; i<100; i++)
//{
// int x = random.Next(image.Width);
// int y = random.Next(image.Height); // image.SetPixel(x, y, Color.FromArgb(random.Next()));
//} //画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose(); image.Dispose();
}
}
}上面的代码是一个页面的内容 页面的名字叫做CreateCheckCodeImage.aspx 然后你需要用到的时候 <asp:Image ID="Image1" runat="server" ImageUrl="CreateCheckCodeImage.aspx" />
就行了
你为什么要在lable1中显示呢????