MVC 返回图片

//调用 http://localhost:60663/home/GetCoder39Img?mycode=123443545

public void GetCoder39Img(string mycode)
{

//string str= Request.QueryString.ToString ();
Response.ContentType = "image/jpeg";

string codeStr;
string c;
//codeStr = "*-%$*"
codeStr = "*" + mycode + "*"; //Code 39 的特性是前、後置碼會標識「星號(*)」，表示開始和結束

int bmpHeight = 35;
int bmpWidth = 0;
int _x = 0;
int _y = 20;
//int 筆寬 = 0;

if (!string.IsNullOrEmpty(mycode))
{
bmpWidth = codeStr.Length * 13;

Bitmap BMP = new Bitmap(bmpWidth, bmpHeight, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
Graphics G = Graphics.FromImage(BMP);
G.TextRenderingHint = TextRenderingHint.AntiAlias;
G.Clear(Color.White);

Brush brush = new SolidBrush(Color.White);
G.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
G.FillRectangle(brush, 0, 0, bmpWidth, bmpHeight);

for (int i = 0; i < codeStr.Length; i++)
{
//取得 Code 39 碼的規則
c = this.genBarcode(codeStr.Substring(i, 1).ToUpper());

for (int j = 0; j < 4; j++)
{
if (c.Substring(j, 1).Equals("0"))
{
G.DrawLine(Pens.Black, _x, 0, _x, _y);
}
else
{
G.DrawLine(Pens.Black, _x, 0, _x, _y);
G.DrawLine(Pens.Black, _x + 1, 0, _x + 1, _y);
_x += 1;
}

_x += 1;

if (c.Substring(j + 5, 1).Equals("0"))
{
G.DrawLine(Pens.White, _x, 0, _x, _y);
}
else
{
G.DrawLine(Pens.White, _x, 0, _x, _y);
G.DrawLine(Pens.White, _x + 1, 0, _x + 1, _y);
_x += 1;
}

_x += 1;
} //end of loop

if (c.Substring(4, 1).Equals("0"))
{
G.DrawLine(Pens.Black, _x, 0, _x, _y);
}
else
{
G.DrawLine(Pens.Black, _x, 0, _x, _y);
G.DrawLine(Pens.Black, _x + 1, 0, _x + 1, _y);
_x += 1;
}

_x += 2;
} //end of loop

int x = 0;
int addx = 13;

G.DrawString("-", new Font("Arial", 10, FontStyle.Italic), SystemBrushes.WindowText, new PointF(x, 20));
x += addx;

for (int k = 0; k < mycode.Length; k++)
{
G.DrawString(mycode.Substring(k, 1), new Font("Arial", 10, FontStyle.Italic), SystemBrushes.WindowText, new PointF(x, 20));
x = x + addx;
}

G.DrawString("-", new Font("Arial", 10, FontStyle.Italic), SystemBrushes.WindowText, new PointF(x, 20));
BMP.Save(Response.OutputStream, ImageFormat.Jpeg);
G.Dispose();
BMP.Dispose();

}

}
/// <summary>
/// Code 39 碼的規則。
/// Code 39 碼可使用的c如下：0~9、A~Z、+、-、*、/、%、$、. 及空白c。
/// </summary>
/// <param name="code"></param>
/// <returns></returns>
public string genBarcode(string code)
{
switch (code)
{
case "0":
code = "001100100";
break;
case "1":
code = "100010100";
break;
case "2":
code = "010010100";
break;
case "3":
code = "110000100";
break;
case "4":
code = "001010100";
break;
case "5":
code = "101000100";
break;
case "6":
code = "011000100";
break;
case "7":
code = "000110100";
break;
case "8":
code = "100100100";
break;
case "9":
code = "010100100";
break;
case "A":
code = "100010010";
break;
case "B":
code = "010010010";
break;
case "C":
code = "110000010";
break;
case "D":
code = "001010010";
break;
case "E":
code = "101000010";
break;
case "F":
code = "011000010";
break;
case "G":
code = "000110010";
break;
case "H":
code = "100100010";
break;
case "I":
code = "010100010";
break;
case "J":
code = "001100010";
break;
case "K":
code = "100010001";
break;
case "L":
code = "010010001";
break;
case "M":
code = "110000001";
break;
case "N":
code = "001010001";
break;
case "O":
code = "101000001";
break;
case "P":
code = "011000001";
break;
case "Q":
code = "000110001";
break;
case "R":
code = "100100001";
break;
case "S":
code = "010100001";
break;
case "T":
code = "001100001";
break;
case "U":
code = "100011000";
break;
case "V":
code = "010011000";
break;
case "W":
code = "110001000";
break;
case "X":
code = "001011000";
break;
case "Y":
code = "101001000";
break;
case "Z":
code = "011001000";
break;
case "*":
code = "001101000";
break;
case "-":
code = "000111000"; //好像辨識不出來
break;
case "%":
code = "100101000"; //好像辨識不出來
break;
case "$":
code = "010101000"; //好像辨識不出來
break;
default:
code = "010101000"; //都不是就印 $
break;
}

return code;
}