asp.net GDI+绘制矩形渐变

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 using System.Drawing;
 8 using System.Drawing.Drawing2D;
 9 
10 public partial class _Default : System.Web.UI.Page
11 {
12     protected void Page_Load(object sender, EventArgs e)
13     {
14         Bitmap bitmap = new Bitmap(200, 100);
15         Graphics graphics = Graphics.FromImage(bitmap);
16         graphics.Clear(Color.White);
17         Rectangle rectangle = new Rectangle(0, 0, 200, 100);
18         LinearGradientBrush mylineargradientbrush = new LinearGradientBrush(rectangle, Color.White, Color.Green, LinearGradientMode.ForwardDiagonal);
19         graphics.FillRectangle(mylineargradientbrush, 0, 0, 200, 100);
20         System.IO.MemoryStream ms = new System.IO.MemoryStream();
21         bitmap.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
22         Response.ClearContent();
23         Response.ContentType="image/Jpeg";
24         Response.BinaryWrite(ms.ToArray());
25     }
26 }