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。
废话不多说，上代码
复制代码 代码如下:
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 =
{
"000110100",
"100100001",
"001100001",
"101100000",
"000110001",
"100110000",
"001110000",
"000100101",
"100100100",
"001100100",
"100001001",
"001001001",
"101001000",
"000011001",
"100011000",
"001011000",
"000001101",
"100001100",
"001001100",
"000011100",
"100000011",
"001000011",
"101000010",
"000010011",
"100010010",
"001010010",
"000000111",
"100000110",
"001000110",
"000010110",
"110000001",
"011000001",
"111000000",
"010010001",
"110010000",
"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。