C# 验证码

using System;
using System.Drawing;

namespace SecurityCode

{
    
    
public class DrawMethod

{
    
    

/// <summary>
/// 画图
/// </summary>
/// <param name="content"></param>
/// <param name="size"></param>
/// <param name="fileName"></param>
       public void Draw(string content,Size size,string fileName)

{
    
    

Image image = new Bitmap(size.Width,size.Height);

Graphics g = Graphics.FromImage(image);

DrawBorder(g,image.Size);

DrawContent(g,content,image.Size,(int)FontSet.Font.Size);

DrawRandom(g, image.Size);

image.Save(@"D:\\" + fileName);

}

/// <summary>
/// 画边框
/// </summary>
/// <param name="g"></param>
/// <param name="size"></param>
       private void DrawBorder(Graphics g, Size size)

{
    
    

Pen pen = new Pen(SolidBrushSet.SolidBrush);

Rectangle rect=new Rectangle(1,1,size.Width-4,size.Height-4);

g.DrawRectangle(pen,rect);

}

//画字符串
       private void DrawContent(Graphics g, string content,Size size,int fontHeight) 

{
    
    

Point point = new Point();
int i = 0;

point.Y = (size.Height - fontHeight) / 2;
int distance = size.Width / (content.Length+1);
foreach (char c in content)

{
    
    

point.X = i * distance + distance/2;

g.DrawString(c.ToString(), FontSet.Font, SolidBrushSet.SolidBrush, point);

i++;

}

}

/// <summary>
/// 画干扰
/// </summary>
/// <param name="g"></param>
/// <param name="size"></param>
       private void DrawRandom(Graphics g, Size size)

{
    
    

Pen pen = new Pen(SolidBrushSet.SolidBrush);

Random rand = new Random();
for (int i = 0; i < 3; i++)

{
    
    

g.DrawLine(pen, rand.Next(size.Width), rand.Next(size.Width), rand.Next(size.Height), rand.Next(size.Height));

}

for (int i = 0; i < 10; i++)

{
    
    

Rectangle rect = new Rectangle(rand.Next(2, size.Width - 2), rand.Next(2, size.Height - 2), 1, 1);

g.DrawRectangle(pen, rect);

}

}


}

}

using System;

namespace SecurityCode

{
    
    
/// <summary>
/// 自动生成字符串
/// </summary>
   public class CreateContent

{
    
    
private string so = "1234567890abcdefghijklmnopqrstuvwxyzQWERTYUIOPASDFGHJKLZXCVBNM";

/// <summary>
/// 生成内容
/// </summary>
/// <returns></returns>
      public string GetContent()

{
    
    

Random rand = new Random();
string str = null;
for (int i = 0; i < 6; i++)

{
    
    

str += so.Substring(rand.Next(62), 1);

}
return str;

}

}

}

using System;
using System.Drawing;

namespace SecurityCode

{
    
    
/// <summary>
/// 字体设置
/// </summary>
    public class FontSet

{
    
    
public static Font Font

{
    
    
get

{
    
    

FontFamily fFamily = GetFontFamily();

FontStyle fStyle = GetFontStyle();
int emSize = GetFontSize();
return new Font(fFamily, emSize, fStyle);

}

}

private FontSet() { }


/// <summary>
/// 设置字体
/// </summary>
        private static FontFamily GetFontFamily()

{
    
    

Random rand = new Random();
return FontFamily.Families[rand.Next(FontFamily.Families.Length)];

}

/// <summary>
/// 设置字体样式
/// </summary>
        private static FontStyle GetFontStyle()

{
    
    

Random rand = new Random();
int index = rand.Next(1, 4);

index = 1 << index;
return (FontStyle)index;

}

/// <summary>
/// 设置字体大小
/// </summary>
        public static int GetFontSize()

{
    
    

Random rand = new Random();
return rand.Next(12, 14);

}

}

}

using System;
using System.Drawing;

namespace SecurityCode

{
    
    
/// <summary>
/// 画笔设置
/// </summary>
   public class SolidBrushSet

{
    
    
/// <summary>
/// 画笔
/// </summary>
       public static SolidBrush SolidBrush

{
    
    
get {
    
    

Color color= GetColor();
return new SolidBrush(color);

}

}

private SolidBrushSet(){}

/// <summary>
/// 随机生成画笔颜色
/// </summary>
/// <returns></returns>
       public static Color GetColor()

{
    
    

Random rand = new Random();
int r = rand.Next(0,255);
int g = rand.Next(0, 255);
int b = rand.Next(0, 255);
return Color.FromArgb(r,g,b);

}

}

}

private void Test()

{
    
    

DrawMethod drawMethod = new DrawMethod();

CreateContent createCont = new CreateContent();
for (int i = 0; i < 10; i++)

{
    
    
string content = createCont.GetContent();

Size size = new Size(100, 40);

drawMethod.Draw(content, size, i.ToString() + ".jpg");

}

}