最近發(fā)現(xiàn)很多網(wǎng)站都是使用的彩色二維碼，放眼望去，網(wǎng)站檔次明顯提升
相比傳統(tǒng)黑白二維碼，彩色二維碼總會(huì)給人眼前一亮的感覺
（如果你不認(rèn)為彩色二維碼比黑白二維碼有趣，也可以不必拘泥于形式）
下面來看下C#.Net中如何生成彩色二維碼。
簡介：C#.Net使用ZXing幫助類生成彩色二維碼，二維碼色調(diào)、二維碼大小根據(jù)自己需要可任意調(diào)節(jié)。
Html頁面布局（其實(shí)就是一個(gè)圖片標(biāo)簽用于展示生成的二維碼）
<!DOCTYPE html>
<html>
<head runat="server">
<title>C#.Net生成彩色漸變二維碼案例</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<img src="/QcHandler.ashx?act=getqc" height="164"
width="164">
</div>
</form>
</body>
</html>
C#后端業(yè)務(wù)邏輯部分代碼展示
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using com.google.zxing.qrcode;
using System.Collections;
using com.google.zxing;
using System.Drawing;
using com.google.zxing.qrcode.decoder;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Text;
using System.IO;
namespace ZXingQcWeb
{
/// <summary>
/// C#.Net生成彩色漸變二維碼案例
/// 作者：hnxxbl.cn
/// </summary>
public class QcHandler : IHttpHandler
{
delegate void func(HttpContext context);
static Dictionary<string, func> services = new Dictionary<string, func>();
public void ProcessRequest(HttpContext context)
{
string action = context.Request["act"];
HttpContext.Current.Response.ContentType = "image/png";
if (!string.IsNullOrEmpty(action) && services.ContainsKey(action))
{
services[action](context);
}
}
static QcHandler()
{
//生成二維碼
services.Add("getqc", delegate(HttpContext context)
{
try
{
string httpstr = "http://hnxxbl.cn";
QRCodeWriter writer = new QRCodeWriter();
Hashtable hints = new Hashtable();
hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.Add(EncodeHintType.VERSION_START, 5);
Bitmap image = writer.encode(httpstr, BarcodeFormat.QR_CODE, 0x150, 0x150, hints).ToBitmap();//黑白二維碼
Bitmap bitmap2 = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb);
Graphics graphics = Graphics.FromImage(bitmap2);
graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.DrawImage(image, 0, 0);
image.Dispose();
Bitmap bitmap3 = QrCodeVertical(bitmap2.Width, bitmap2.Height);//彩色漸變二維碼
Color color = Color.FromArgb(200, 224, 120, 1);
int num = 96;
try
{
num -= (Encoding.UTF8.GetBytes(httpstr).Length - 20) / 2;
}
catch (Exception)
{
}
int num2 = num;
int num3 = num2;
for (int i = 0; i < bitmap2.Width; i )
{
for (int j = 0; j < bitmap2.Height; j )
{
Color color3;
Color pixel = bitmap2.GetPixel(i, j);
if ((i < num2) && (j < num3))
{
color3 = ((pixel.A == 0xff) && (pixel.B == 0)) ? color : pixel;
}
else
{
color3 = ((pixel.A == 0xff) && (pixel.B == 0)) ? bitmap3.GetPixel(i, j) : pixel;
}
bitmap2.SetPixel(i, j, color3);
}
}
bitmap3.Dispose();
MemoryStream ms = new MemoryStream();
bitmap2.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
ms.Close();
context.Response.BinaryWrite(ms.ToArray());
return;
}
catch { }
});
}
/// <summary>
/// 設(shè)置二維碼圖片顏色
/// </summary>
/// <param name="width"></param>
/// <param name="heigth"></param>
/// <returns></returns>
private static Bitmap QrCodeVertical(int width, int heigth)
{
var image = new Bitmap(width, heigth, PixelFormat.Format32bppArgb);
var rect = new Rectangle(0, 0, width, heigth);
var brush = new LinearGradientBrush(rect, Color.FromArgb(230, 0x23, 0xa9, 160), Color.FromArgb(0xff, 8, 60, 0x63), LinearGradientMode.Vertical);
Graphics graphics = Graphics.FromImage(image);
graphics.FillRectangle(brush, rect);
graphics.Dispose();
return image;
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
生成的彩色二維碼效果展示
如果你有興趣研究的話，可以下載此DEMO源碼自行開發(fā)改造屬于你自己的五彩二維碼（注意：項(xiàng)目中已引用zxing.dll）。