01.<%@ Page Language="C#" Debug="true" %>
02.<%@ Import Namespace="System.Drawing" %>
03.<%@ Import Namespace="System.Drawing.Imaging" %>
04.
05.<script runat="server">
06. void btnUpload_OnClick(object sender, EventArgs e)
07. {
08.
09. if (this.fiUpload.HasFile) {
10.
11. int intWidth = 0;
12. int intHeight = 0;
13. string UlFileName = null;
14. string NewFileName = null;
15.
16. intWidth = 100;
17.
18.
19. intHeight = 120;
20.
21. UlFileName = "MyImages/" + fiUpload.FileName;
22.
23.
24. this.fiUpload.SaveAs(Server.MapPath(UlFileName));
25.
26. NewFileName = "MyImages/Thumbnail_" + fiUpload.FileName;
27.
28.
29. System.Drawing.Image objGraphic = System.Drawing.Image.FromFile(Server.MapPath(UlFileName));
30.
31. Bitmap objBitmap = default(Bitmap);
32.
33. if (intHeight > 0) {
34. objBitmap = new Bitmap(objGraphic, intWidth, intHeight);
35. }
36. else {
37. if (objGraphic.Width > intWidth) {
38. double ratio = objGraphic.Height / objGraphic.Width;
39. intHeight = (int)ratio * (int)intWidth;
40. objBitmap = new Bitmap(objGraphic, intWidth, intHeight);
41. }
42. else {
43. objBitmap = new Bitmap(objGraphic);
44. }
45. }
46.
47.
48. objBitmap.Save(Server.MapPath(NewFileName.ToString()), objGraphic.RawFormat);
49.
50.
51. objGraphic.Dispose();
52.
53.
54. this.imgPicture.Visible = true;
55. this.imgPicture.ImageUrl = NewFileName;
56. }
57. }
58.</script>
59.<html>
60.<head>
61.<title>ThaiCreate.Com ASP.NET - Images (System.Drawing)</title>
62.</head>
63.<body>
64. <form id="form1" runat="server">
65. <asp:FileUpload id="fiUpload" runat="server"></asp:FileUpload>
66. <input id="btnUpload" type="button" OnServerClick="btnUpload_OnClick" value="Upload" runat="server" />
67. <hr />
68. <asp:Image id="imgPicture" Visible="false" runat="server" /><br /><br />
69. </form>
70.</body>
71.</html>
72.</form>
C#
ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน 
