Sharepoint 列表ItemAdding事件判断文件类型、获取当前上传的文件

 1 using System;
 2 using System.Security.Permissions;
 3 using Microsoft.SharePoint;
 4 using Microsoft.SharePoint.Security;
 5 using Microsoft.SharePoint.Utilities;
 6 using Microsoft.SharePoint.Workflow;
 7 using System.Web;
 8 using System.IO;
 9 
10 namespace TestSharePointProject.DocEvent
11 {
12     /// <summary>
13     /// List Item Events
14     /// </summary>
15     public class DocEvent : SPItemEventReceiver
16     {
17         HttpContext currentContext;
18         public DocEvent()
19         {
20             currentContext = HttpContext.Current;
21         }
22 
23        /// <summary>
24        /// An item is being added.
25        /// </summary>
26         public override void ItemAdding(SPItemEventProperties properties)
27         {
28             //将上载的文件URL按.分为两部分:URL和文件类型
29             string[] fileUrl = properties.BeforeUrl.Split('.');
30             if (fileUrl.Length == 1)
31             {
32                 properties.ErrorMessage = "文件类型不合法！";
33                 properties.Cancel = true;
34             }
35             else
36             {
37                 //获取上载的文件类型
38                 string postFix = fileUrl[fileUrl.Length - 1].ToLower();
39                 if (!postFix.Contains("xlsx") && !postFix.Contains("xls"))
40                 {
41                     properties.ErrorMessage = "请选择上传Excel文件！";
42                     properties.Cancel = true;
43                 }
44                 else {
45                     if (currentContext != null)
46                     {
47                         if (currentContext.Request.Files.Count > 0)
48                         {
49                             //获取Item中被上传的所有文件
50                             for (int i = 0; i < currentContext.Request.Files.Count; i++)
51                             {
52                                 if (!string.IsNullOrEmpty(currentContext.Request.Files[i].FileName))
53                                 {
54                                     FileStream file = null;
55                                     string path = currentContext.Request.Files[i].FileName.ToString();
56 
57                                     // Read the file. This appears to be the offending line
58                                     file = File.OpenRead(path);
59                                     byte[] Content = new byte[file.Length];
60                                     file.Read(Content, 0, (int)file.Length);
61                                     file.Close();
62                                     file.Dispose();
63                                     //itemToAdd.Attachments.Add(currentContext.Request.Files[i].FileName, Content);
64                                 }
65                             }
66                         }
67                     }
68                 }
69             }
70         }
71 
72        /// <summary>
73        /// An item is being updated.
74        /// </summary>
75        public override void ItemUpdating(SPItemEventProperties properties)
76        {
77            base.ItemUpdating(properties);
78        }
79 
80     }
81 }