c# windows 应用程序 验证码问题
{
if (this.textBox1.Text.Trim() == "" || this.textBox2.Text.Trim() == "")
{
MessageBox.Show("请输入用户名或密码", "错误提示");
}
else
{
const string sql = "select RoleName from UserInfo where [user]=@name and Password=@pass";
SqlParameter pName = new SqlParameter("@name",textBox1.Text.Trim());
SqlParameter pPass = new SqlParameter("@pass",this.textBox2.Text.Trim());
SqlParameter [] pram = new SqlParameter[]{pName,pPass};
object obj = SqlHelper.ExecuteScalar(CommandType.Text, sql, pram);
if (obj != null)
{
this.Visible = false;
Main main = new Main();
main.Tag = this.FindForm();
const string sqls = "select * from Roles where RoleName=@name";
SqlParameter name = new SqlParameter("@name", obj.ToString());
SqlParameter[] prams = new SqlParameter[] { name };
SqlDataReader xq = SqlHelper.ExecuteReader(CommandType.Text,sqls,prams);
if (xq.Read())
{
main.XTMenuItem.Visible = (bool)(xq.GetValue(1));
main.CJMenuItem.Visible = (bool)(xq.GetValue(2));
main.ZYMenuItem.Visible = (bool)(xq.GetValue(3));
main.BJMenuItem.Visible = (bool)(xq.GetValue(4));
}
main.StatusLabel2.Text = textBox1.Text.Trim();
main.ShowDialog();
}
else
{
MessageBox.Show("用户名或密码错误", "登录失败");
}
}
}
private void button2_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void Form1_Load(object sender, EventArgs e)
{
textBox1.Focus();
label3.Text = this.shuiji(4);
}
public string shuiji(int weishu)//weishu为要生成几位随机字符
{
string str = "abcdefghigklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
string fh = "";//记录随机产生的符号
Random rd = new Random();
int a = 0;
for (int i = 1; i <= weishu; i++)
{
a = rd.Next(0, 61);
fh += str[a].ToString();
}
return fh;
}
这个能产生随机数了 可是都是黑色，想让他随机变颜色，还有想在登录时判断验证码是否输入正确，错误提示输入错误，正确就登录进主页面，该在哪里添加代码？ 展开
要的如下效果么.我写成了一个用户控件,代码如下:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication2
{
public partial class CodeControl : UserControl
{
private string _code = "";
public string Code {
get { return this._code; }
}
public CodeControl()
{
InitializeComponent();
}
public void CreateCodeImage() {
string[] str = new string[4];
string serverCode = "";
//生成随机生成器
Random random = new Random();
_code = "";
for (int i = 0; i < 4; i++)
{
str[i] = random.Next(10).ToString().Substring(0, 1);
_code += str[i];
}
CreateCodeImage(str);
}
private void CreateCodeImage(string[] checkCode)
{
if (checkCode == null || checkCode.Length <= 0)
return;
//System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), this.CodePictureBox.Height);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(this.CodePictureBox.Width, this.CodePictureBox.Height);
System.Drawing.Graphics g = Graphics.FromImage(image);
try
{
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 < 20; 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);
}
//定义颜色
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] f = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
for (int k = 0; k <= checkCode.Length - 1; k++)
{
int cindex = random.Next(7);
int findex = random.Next(5);
Font drawFont = new Font(f[findex], 16, (System.Drawing.FontStyle.Bold));
SolidBrush drawBrush = new SolidBrush(c[cindex]);
float x = 3.0F;
float y = 0.0F;
float width = 20.0F;
float height = 25.0F;
int sjx = random.Next(10);
int sjy = random.Next(image.Height - (int)height);
RectangleF drawRect = new RectangleF(x + sjx + (k * 14), y + sjy, width, height);
StringFormat drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Center;
g.DrawString(checkCode[k], drawFont, drawBrush, drawRect, drawFormat);
}
//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);
this.CodePictureBox.Image = Image.FromStream(ms);
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
}
验证码字符 保存在Code属性中
