条形码在生活中的应用非常广泛，具体的条形码知识大家自行百度，了解条形码知识对理解下面的代码是必要的。如果只是应用的话，直接拿去就可以用了。
[b]废话不多说，上代码
[/b]
public Bitmap GetCode39(string sourceCode)
{
int leftMargin = 5;
int topMargin = 0;
int thickLength = 2;
int narrowLength = 1;
int barCodeHeight = 35;
int intSourceLength = sourceCode.Length;
string strEncode = "010010100"; //添加起始码“*”.
var font = new System.Drawing.Font("Segoe UI", 5);
string AlphaBet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*";
string[] Code39 =
{
/* 0 */ "000110100",
/* 1 */ "100100001",
/* 2 */ "001100001",
/* 3 */ "101100000",
/* 4 */ "000110001",
/* 5 */ "100110000",
/* 6 */ "001110000",
/* 7 */ "000100101",
/* 8 */ "100100100",
/* 9 */ "001100100",
/* A */ "100001001",
/* B */ "001001001",
/* C */ "101001000",
/* D */ "000011001",
/* E */ "100011000",
/* F */ "001011000",
/* G */ "000001101",
/* H */ "100001100",
/* I */ "001001100",
/* J */ "000011100",
/* K */ "100000011",
/* L */ "001000011",
/* M */ "101000010",
/* N */ "000010011",
/* O */ "100010010",
/* P */ "001010010",
/* Q */ "000000111",
/* R */ "100000110",
/* S */ "001000110",
/* T */ "000010110",
/* U */ "110000001",
/* V */ "011000001",
/* W */ "111000000",
/* X */ "010010001",
/* Y */ "110010000",
/* Z */ "011010000",
/* - */ "010000101",
/* . */ "110000100",
/*' '*/ "011000100",
/* $ */ "010101000",
/* / */ "010100010",
/* + */ "010001010",
/* % */ "000101010",
/* * */ "010010100"
};
sourceCode = sourceCode.ToUpper();
Bitmap objBitmap = new Bitmap(
((thickLength * 3 + narrowLength * 7) * (intSourceLength + 2)) + (leftMargin * 2),
barCodeHeight + (topMargin * 2));
Graphics objGraphics = Graphics.FromImage(objBitmap);
objGraphics.FillRectangle(Brushes.White, 0, 0, objBitmap.Width, objBitmap.Height);
for (int i = 0; i < intSourceLength; i++)
{
//非法字符校验
if (AlphaBet.IndexOf(sourceCode[i]) == -1 || sourceCode[i] == '*')
{
objGraphics.DrawString("Invalid Bar Code",
SystemFonts.DefaultFont, Brushes.Red, leftMargin, topMargin);
return objBitmap;
}
//编码
strEncode = string.Format("{0}0{1}", strEncode,
Code39[AlphaBet.IndexOf(sourceCode[i])]);
}
strEncode = string.Format("{0}0010010100", strEncode); //添加结束码“*”
int intEncodeLength = strEncode.Length;
int intBarWidth;
for (int i = 0; i < intEncodeLength; i++) //绘制 Code39 barcode
{
intBarWidth = strEncode[i] == '1' ? thickLength : narrowLength;
objGraphics.FillRectangle(i % 2 == 0 ? Brushes.Black : Brushes.White,
leftMargin, topMargin, intBarWidth, barCodeHeight);
leftMargin += intBarWidth;
}
//绘制 明码
SizeF sizeF = objGraphics.MeasureString(sourceCode, font);
float x=(objBitmap.Width - sizeF.Width) / 2;
float y = objBitmap.Height - sizeF.Height;
objGraphics.FillRectangle(Brushes.White, x, y, sizeF.Width, sizeF.Height);
objGraphics.DrawString(sourceCode, font, Brushes.Black, x, y);
return objBitmap;
}
新建一个Winform程序拖一个PictureBox控件，然后把方法返回的图片绑到PictureBox上，就可以看到结果了。
以上代码需要引用 System.Drawing 命名空间。
顺带提一句，还有一种最简单的办法就是下载条形码字体，然后输出的时候设定字体为条形码字体，显示的就是条形码了。不过你不能要求每个客户机都装这种字体。这个是个明显的缺陷,所以不推荐使用这种方法。
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