Cropping images in GDI +

Cutimage
1 void cutimage (httppostedfile post, string ppuid, out string imagename)
2 {
3 system. Drawing. Image sourceimg = system. Drawing. image. fromstream (post. inputstream );
4 If (sourceimg. Height> confighelper. userfacemaxheight)
5 {
6 This. _ lbl_upload_msg.text = "the maximum height cannot be greater than" + confighelper. userfacemaxheight;
7 return;
8}
9 If (sourceimg. width> confighelper. userfacemaxwidth)
10 {
11 This. _ lbl_upload_msg.text = "the maximum width cannot be greater than" + confighelper. userfacemaxwidth;
12 return;
13}
14 imageformat format = getimageformat (system. Io. Path. getextension (post. filename ));
15 string filename = ppuid + "." + format. tostring ();
16 imagename = filename;
17
18 if (! Userfacedir. endswith ("\\"))
19 userfacedir = userfacedir + "\\";
20 filename = userfacedir + filename;
21 int sourceimgwidth = sourceimg. width;
22 int sourceimgheight = sourceimg. height;
23 if (sourceimgwidth! = Confighelper. userfacewidth) & (sourceimgheight! = Confighelper. userfaceheight ))
24 {
25 // If the width and height ratio are, the thumbnail is directly formed.
26 if (double) sourceimgwidth/sourceimgheight) = 1)
27 {
28 system. Drawing. Image thumbimg = sourceimg. getthumbnailimage (confighelper. userfacewidth, confighelper. userfaceheight, null, intptr. Zero );
29 thumbimg. Save (filename, format );
30 thumbimg. Dispose ();
31 sourceimg. Dispose ();
32 return;
33}
34 bitmap bit = new Bitmap (sourceimg );
35 rectangle rec = new rectangle (); // construct a rectangle class and a rectangle
36 Rec. width = confighelper. userfacewidth;
37 Rec. Height = confighelper. userfaceheight;
38 If (sourceimgwidth> Rec. width)
39 Rec. x = (sourceimgwidth-Rec. width)/2;
40 else
41 {
42 Rec. x = 0;
43 Rec. width = sourceimg. width;
44}
45 if (sourceimgheight> Rec. Height)
46 Rec. Y = (sourceimgheight-Rec. Height)/2;
47 else
48 {
49 Rec. Y = 0;
50 Rec. Height = sourceimg. height;
51}
52
53 try
54 {
55 // here, we will clone the bitmap constructed during the upload process and crop it according to the defined rectangle.
56 bit. Clone (REC, pixelformat. dontcare). Save (filename, format );
57}
58 catch (exception ex)
59 {
60 this. _ lbl_upload_msg.text = ex. message;
61 return;
62}
63 finally
64 {
65 bit. Dispose ();
66 sourceimg. Dispose ();
67}
68}
69}
70