public sealed class Code39
{
#region private variables
/// summary>
/// The Space Between each of Title, BarCode, BarCodeString
/// /summary>
private const int SPACE_HEIGHT = 3;
SizeF _sizeLabel = SizeF.Empty;
SizeF _sizeBarCodeValue = SizeF.Empty;
SizeF _sizeBarCodeString = SizeF.Empty;
#endregion
#region Label
private string _label = null;
private Font _labelFont = null;
/// summary>
/// BarCode Title (條碼標簽)
/// /summary>
public string Label
{
set { _label = value; }
}
/// summary>
/// BarCode Title Font (條碼標簽使用的字體)
/// /summary>
public Font LabelFont
{
get
{
if (_labelFont == null)
return new Font("Arial", 10);
return _labelFont;
}
set { _labelFont = value; }
}
#endregion
private string _additionalInfo = null;
private Font _addtionalInfoFont = null;
/// summary>
/// Additional Info Font (附加信息字體)
/// /summary>
public Font AdditionalInfoFont
{
set { _addtionalInfoFont = value; }
get
{
if (_addtionalInfoFont == null) return new Font("Arial", 10);
return _addtionalInfoFont;
}
}
/// summary>
/// Additional Info Content, if "ShowBarCodeValue" is true, the info is unvisible
/// 附加信息，如果設置ShowBarCodeValue為true,則此項不顯示
/// /summary>
public string AdditionalInfo
{
set { _additionalInfo = value; }
}
#region BarCode Value and Font
private string _barCodeValue = null;
/// summary>
/// BarCode Value (條碼值)
/// /summary>
public string BarCodeValue
{
get
{
if (string.IsNullOrEmpty(_barCodeValue))
throw new NullReferenceException("The BarCodeValue has not been set yet!");
return _barCodeValue;
}
set { _barCodeValue = value.StartsWith("*") value.EndsWith("*") ? value : "*" + value + "*"; }
}
private bool _showBarCodeValue = false;
/// summary>
/// whether to show the original string of barcode value bellow the barcode
/// 是否在條碼下方顯示條碼值，默認為false
/// /summary>
public bool ShowBarCodeValue
{
set { _showBarCodeValue = value; }
}
private Font _barCodeValueFont = null;
/// summary>
/// the font of the codestring to show
/// 條碼下方顯示的條碼值的字體
/// /summary>
public Font BarCodeValueFont
{
get
{
if (_barCodeValueFont == null)
return new Font("Arial", 10);
return _barCodeValueFont;
}
set { _barCodeValueFont = value; }
}
private int _barCodeFontSize = 50;
/// summary>
/// the font size of the barcode value to draw
/// 條碼繪制的大小，默認50
/// /summary>
public int BarCodeFontSzie
{
set { _barCodeFontSize = value; }
}
#endregion
#region generate the barcode image
private Bitmap BlankBackImage
{
get
{
int barCodeWidth = 0, barCodeHeight = 0;
using (Bitmap bmp = new Bitmap(1, 1, PixelFormat.Format32bppArgb))
{
using (Graphics g = Graphics.FromImage(bmp))
{
if (!string.IsNullOrEmpty(_label))
{
_sizeLabel = g.MeasureString(_label, LabelFont);
barCodeWidth = (int)_sizeLabel.Width;
barCodeHeight = (int)_sizeLabel.Height + SPACE_HEIGHT;
}
_sizeBarCodeValue = g.MeasureString(BarCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize));
barCodeWidth = Math.Max(barCodeWidth, (int)_sizeBarCodeValue.Width);
barCodeHeight += (int)_sizeBarCodeValue.Height;
if (_showBarCodeValue)
{
_sizeBarCodeString = g.MeasureString(_barCodeValue, BarCodeValueFont);
barCodeWidth = Math.Max(barCodeWidth, (int)_sizeBarCodeString.Width);
barCodeHeight += (int)_sizeBarCodeString.Height + SPACE_HEIGHT;
}
//else
//{
// if (!string.IsNullOrEmpty(_additionalInfo))
// {
// _sizeAdditionalInfo = g.MeasureString(_additionalInfo, AdditionalInfoFont);
// barCodeWidth = Math.Max(barCodeWidth, (int)_sizeAdditionalInfo.Width);
// barCodeHeight += (int)_sizeAdditionalInfo.Height + SPACE_HEIGHT;
// }
//}
}
}
return new Bitmap(barCodeWidth, barCodeHeight, PixelFormat.Format32bppArgb);
}
}
/// summary>
/// Draw the barcode value to the blank back image and output it to the browser
/// 繪制WebForm形式的條碼
/// /summary>
/// param name="ms">Recommand the "Response.OutputStream" 使用 Response.OutputStream/param>
/// param name="imageFormat">The Image format to the Browser 輸出到瀏覽器到圖片格式，建議GIF/param>
public Bitmap CreateWebForm(Stream ms, ImageFormat imageFormat)
{
int barCodeWidth, barCodeHeight;
using (Bitmap bmp = this.BlankBackImage)
{
barCodeHeight = bmp.Height;
barCodeWidth = bmp.Width;
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.White);
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
int vPos = 0;
////Draw Label String
if (!string.IsNullOrEmpty(_label))
{
g.DrawString(_label, LabelFont, new SolidBrush(Color.Black),
XCenter((int)_sizeLabel.Width, barCodeWidth), vPos);
vPos += (int)_sizeLabel.Height + SPACE_HEIGHT;
}
else { vPos = SPACE_HEIGHT; }
////Draw The Bar Value
g.DrawString(_barCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize), new SolidBrush(Color.Black),
XCenter((int)_sizeBarCodeValue.Width, barCodeWidth), vPos);
////Draw the BarValue String
if (_showBarCodeValue)
{
g.DrawString(_barCodeValue, BarCodeValueFont, new SolidBrush(Color.Black),
XCenter((int)_sizeBarCodeString.Width, barCodeWidth),
vPos + (int)_sizeBarCodeValue.Height);
}
//else
//{
// if (!string.IsNullOrEmpty(_additionalInfo))
// {
// g.DrawString(_additionalInfo, AdditionalInfoFont, new SolidBrush(Color.Black),
// XCenter((int)_sizeAdditionalInfo.Width, barCodeWidth),
// vPos + (int)_sizeBarCodeValue.Height);
// }
//}
}
bmp.Save(ms, imageFormat);
return bmp;
}
}
/// summary>
/// 生成winform格式的條碼
/// /summary>
/// param name="imageFormat">圖片格式，建議GIF/param>
/// returns>Stream類型/returns>
public Stream CreateWinForm(ImageFormat imageFormat)
{
int barCodeWidth, barCodeHeight;
using (Bitmap bmp = this.BlankBackImage)
{
barCodeHeight = bmp.Height;
barCodeWidth = bmp.Width;
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.White);
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
int vPos = 0;
////Draw Label String
if (!string.IsNullOrEmpty(_label))
{
g.DrawString(_label, LabelFont, new SolidBrush(Color.Black),
XCenter((int)_sizeLabel.Width, barCodeWidth), vPos);
vPos += (int)_sizeLabel.Height + SPACE_HEIGHT;
}
else { vPos = SPACE_HEIGHT; }
////Draw The Bar Value
g.DrawString(_barCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize), new SolidBrush(Color.Black),
XCenter((int)_sizeBarCodeValue.Width, barCodeWidth), vPos);
////Draw the BarValue String
if (_showBarCodeValue)
{
g.DrawString(_barCodeValue, BarCodeValueFont, new SolidBrush(Color.Black),
XCenter((int)_sizeBarCodeString.Width, barCodeWidth),
vPos + (int)_sizeBarCodeValue.Height);
}
//else
//{
// //if (!string.IsNullOrEmpty(_additionalInfo))
// //{
// // g.DrawString(_additionalInfo, AdditionalInfoFont, new SolidBrush(Color.Black),
// // //XCenter((int)_sizeAdditionalInfo.Width, barCodeWidth),
// // vPos + (int)_sizeBarCodeValue.Height);
// //}
//}
}
Stream ms = new MemoryStream();
bmp.Save(ms, imageFormat);
return ms;
}
}
#endregion
private static int XCenter(int subWidth, int globalWidth)
{
return (globalWidth - subWidth) / 2;
}
}

protected void Page_Load(object sender, EventArgs e)
{
Code39 code39 = new Code39();
code39.BarCodeValue = "LDSO-001";
code39.BarCodeFontSzie = 60;
// code39.Label = "39碼，底部顯示碼值";
code39.ShowBarCodeValue = true;
Response.Write(code39.CreateWebForm(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif));
code39 = null;
}