求一个C#程序代码（用随机数随即显示图片）？
0
最佳答案
-1
是不是要这个？
string[] PictureFiles = {"1.jpg", "2.jpg", "3.jpg" };
Random rand = new Random();
private void button1_Click(object sender, EventArgs e)
{
pictureBox1.ImageLocation = PictureFiles[rand.Next(0, PictureFiles.Length)];
}
其他回答(1)
-1
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;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
//产生随机数的函数
private string GenerateCheckCode()
{
int number;
char code;
//空字符串且为只读属性
string checkCode = String.Empty;
//新建一个随机数产生器
System.Random random = new Random();
for (int i = 0; i < 5; i++)
{ //随机产生一个整数
number = random.Next();
//如果随机数是偶数 取余
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
//如果随机数是奇数 选择从[A-Z]
code = (char)('A' + (char)(number % 26));
//5个字符的组合
checkCode += code.ToString();
}
//将字符串checkCode写入Cookies并且返回字符串checkCode
Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
return checkCode;
}
//建立一个随机图形
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);
}
//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();
}
}
}
