C# 手动/自动保存图片

1. //手动保存图片  
2.         private void saveBtn_Click(object sender, System.EventArgs e)  
3.         {  
4.             bool isSave = true;  
5.             SaveFileDialog saveImageDialog = new SaveFileDialog();  
6.             saveImageDialog.Title = "图片保存";  
7.             saveImageDialog.Filter= @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";  
8.   
9.             if(saveImageDialog.ShowDialog() == DialogResult.OK)  
10.             {  
11.                 string fileName = saveImageDialog.FileName.ToString();  
12.        
13.                 if(fileName != "" && fileName != null)  
14.                 {  
15.                     string fileExtName = fileName.Substring(fileName.LastIndexOf(".")+1).ToString();  
16.   
17.                     System.Drawing.Imaging.ImageFormat imgformat = null;       
18.    
19.                     if(fileExtName!="")  
20.                     {  
21.                         switch(fileExtName)   
22.                         {   
23.                             case "jpg":   
24.                                 imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;   
25.                                 break;   
26.                             case "bmp":   
27.                                 imgformat = System.Drawing.Imaging.ImageFormat.Bmp;   
28.                                 break;   
29.                             case "gif":   
30.                                 imgformat = System.Drawing.Imaging.ImageFormat.Gif;   
31.                                 break;   
32.                             default:   
33.                                 MessageBox.Show("只能存取为: jpg,bmp,gif 格式");   
34.                                 isSave = false;  
35.                                 break;   
36.                         }   
37.   
38.                     }  
39.   
40.                     //默认保存为JPG格式  
41.                     if(imgformat == null)  
42.                     {  
43.                         imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;  
44.                     }  
45.                       
46.                     if(isSave)  
47.                     {  
48.                         try  
49.                         {  
50.                                 this.pictureBox1.Image.Save(fileName,imgformat);  
51.                                 //MessageBox.Show("图片已经成功保存!");  
52.                         }  
53.                         catch  
54.                         {  
55.                             MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");  
56.                         }  
57.                     }  
58.   
59.                 }  
60.   
61.             }  
62.         }  
63.   
64.         //自动保存图片  
65.         private void Autosave()  
66.         {  
67.             string Opath =@"D:/VedioCapture/Photo";  
68.             string photoname = DateTime.Now.Ticks.ToString();  
69.             if (Opath.Substring(Opath.Length-1, 1) != @"/")  
70.                 Opath = Opath + @"/";  
71.             string path1 = Opath + DateTime.Now.ToShortDateString();  
72.             if (! Directory.Exists(path1))            
73.                 Directory.CreateDirectory(path1);  
74.             //pictureBox1.Image.Save(path1 +"//" + photoname + ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);  
75.             //图像的缩小  
76.             System.Drawing.Bitmap objPic,objNewPic;  
77.             try  
78.             {  
79.                 objPic = new System.Drawing.Bitmap(pictureBox1.Image);  
80.                 objNewPic=new System.Drawing.Bitmap(objPic,pictureBoxShow.Width,pictureBoxShow.Height);  
81.                 //objNewPic=new System.Drawing.Bitmap(objPic,320,240);//图片保存的大小尺寸  
82.                 objNewPic.Save(path1 +"//" + photoname + ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);  
83.             }  
84.             catch(Exception exp){throw exp;}  
85.             finally  
86.             {  
87.                 objPic=null;  
88.                 objNewPic=null;  
89.             }  
90.         }