文件上传通用类 itprobie

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 
 6 using System.IO;
 7 using System.Web.UI.WebControls;
 8 
 9 public class FileUploadHelper
10 {
11     private HttpPostedFile postedFile;
12 
13     public FileUploadHelper(HttpPostedFile postedFile)
14     {
15         this.postedFile = postedFile;
16     }
17 
18     public void SaveAsById(string directoryRelativePath, string id)
19     {
20         string fullPath = string.Format("{0}/{1}{2}",
21            directoryRelativePath,
22             id,
23             new FileInfo(postedFile.FileName).Extension);
24         SaveAs(fullPath);
25     }
26 
27 
28     public void SaveAsByName(string directoryRelativePath, string fileName)
29     {
30         string fileSavePath = string.Format("{0}/{1}", directoryRelativePath, fileName);
31         SaveAs(fileSavePath);
32     }
33 
34 
35     public void SaveAs(string fileRelativePath)
36     {
37         if (HasFile())
38         {
39             FileInfo fileInfo = new FileInfo(fileRelativePath);
40             if (!Directory.Exists(fileInfo.Directory.FullName))
41                 Directory.CreateDirectory(fileInfo.Directory.FullName);
42             postedFile.SaveAs(fileInfo.FullName);
43         }
44     }
45 
46     public string GetFileExtension()
47     {
48         if (HasFile())
49             return new FileInfo(postedFile.FileName)
50                 .Extension;
51         else
52             return "";
53     }
54 
55     public string GeName()
56     {
57         if (HasFile())
58             return new FileInfo(postedFile.FileName)
59                 .Name;
60         else
61             return "";
62     }
63 
64     public string GetSavePath(string directoryRelativePath, string id)
65     {
66         string fileName = string.Format("{0}{1}", id, new FileInfo(postedFile.FileName).Extension);
67         return string.Format("{0}\\{1}", directoryRelativePath, fileName);
68     }
69 
70 
71     public bool HasFile()
72     {
73         return postedFile.ContentLength > 0;
74     }
75 }