asp.net(C#)生成Code39条形码实例 条码枪可以扫描出(3)

for (int i = 0; i != _ValueChar.Length; i++)
            {
                if (p_StarChar == true && _ValueChar[i] == '*') throw new Exception("带有起始符号不能出现*");

object _CharCode = m_Code39[_ValueChar[i].ToString()];
                if (_CharCode == null) throw new Exception("不可用的字符" + _ValueChar[i].ToString());
                _CodeText += _CharCode.ToString();
            }

if (p_StarChar == true) _CodeText += m_Code39["*"];

Bitmap _CodeBmp = GetImage(_CodeText);
            GetViewImage(_CodeBmp, p_Text);
            return _CodeBmp;
        }

/// <summary>
        /// 绘制编码图形
        /// </summary>
        /// <param>编码</param>
        /// <returns>图形</returns>
        private Bitmap GetImage(string p_Text)
        {
            char[] _Value = p_Text.ToCharArray();

//宽 == 需要绘制的数量*放大倍数 + 两个字的宽  
            Bitmap _CodeImage = new Bitmap(_Value.Length * ((int)m_Magnify + 1), (int)m_Height);
            Graphics _Garphics = Graphics.FromImage(_CodeImage);

_Garphics.FillRectangle(Brushes.White, new Rectangle(0, 0, _CodeImage.Width, _CodeImage.Height));

int _LenEx = 0;
            for (int i = 0; i != _Value.Length; i++)
            {
                int _DrawWidth = m_Magnify + 1;
                if (_Value[i] == '1')
                {
                    _Garphics.FillRectangle(Brushes.Black, new Rectangle(_LenEx, 0, _DrawWidth, m_Height));

}
                else
                {
                    _Garphics.FillRectangle(Brushes.White, new Rectangle(_LenEx, 0, _DrawWidth, m_Height));
                }
                _LenEx += _DrawWidth;
            }

_Garphics.Dispose();
            return _CodeImage;
        }
        /// <summary>
        /// 绘制文字
        /// </summary>
        /// <param>图形</param>
        /// <param>文字</param>
        private void GetViewImage(Bitmap p_CodeImage, string p_Text)
        {
            if (m_ViewFont == null) return;
            Graphics _Graphics = Graphics.FromImage(p_CodeImage);
            SizeF _FontSize = _Graphics.MeasureString(p_Text, m_ViewFont);