Asp.net 2.0 用 FileUpload 控件实现多文件上传(用户控件)

示例代码:
1public partial class UpMultiFileControl2 : System.Web.UI.UserControl
2{
3 protected void Page_Load(object sender, EventArgs e)
4 {
5 if (!Page.IsPostBack)
6 {
7 SaveCurrentPageFileControls();
8 }
9 }
10 protected void btAddFile_Click(object sender, EventArgs e)
11 {
12 AddOneFileControl();
13 }
14
15 /**//// 〈summary〉
16 /// 添加一个上传文件控件
17 /// 〈/summary〉
18 private void AddOneFileControl()
19 {
20 ArrayList al = new ArrayList();
21 this.tbFiles.Rows.Clear();
22 GetFileControlsFromSession();
23 HtmlTableRow htr = new HtmlTableRow();
24 HtmlTableCell htc = new HtmlTableCell();
25 htc.Controls.Add(new FileUpload());
26 htr.Controls.Add(htc);
27 this.tbFiles.Rows.Add(htr);
28 SaveCurrentPageFileControls();
29 }
30
31 /**//// 〈summary〉
32 /// 读取缓存中存储的上传文件控件集
33 /// 〈/summary〉
34 private void GetFileControlsFromSession()
35 {
36 ArrayList al = new ArrayList();
37 if (Session[“FilesControls“] != null)
38 {
39 al = (System.Collections.ArrayList)Session[“FilesControls“];
40 for (int i = 0; i 〈 al.Count; i++)
41 {
42 HtmlTableRow htr1 = new HtmlTableRow();
43 HtmlTableCell htc1 = new HtmlTableCell();
44 htc1.Controls.Add((System.Web.UI.WebControls.FileUpload)al[i]);
45 htr1.Controls.Add(htc1);
46 this.tbFiles.Rows.Add(htr1);
47 }
48 }
49 }
50
51 /**//// 〈summary〉
52 /// 保存当前页面上传文件控件集到缓存中
53 /// 〈/summary〉
54 private void SaveCurrentPageFileControls()
55 {
56 ArrayList al = new ArrayList();
57 foreach (Control controlTR in this.tbFiles.Controls)
58 {
59 if (controlTR.GetType().ToString() == “System.Web.UI.HtmlControls.HtmlTableRow“)
60 {
61 HtmlTableCell htc = (HtmlTableCell)controlTR.Controls[0];
62 foreach (Control controlFileUpload in htc.Controls)
63 {
64 if (controlFileUpload.GetType().ToString() == “System.Web.UI.WebControls.FileUpload“)
65 {
66 FileUpload tempFileUpload = (FileUpload)controlFileUpload;
67 al.Add(tempFileUpload);
68 }
69 }
70 }
71 }
72 Session.Add(“FilesControls“, al);
73 }
74
75 protected void btUpFiles_Click(object sender, EventArgs e)
76 {
77 UpLoadFiles();
78 }
79
80 /**//// 〈summary〉
81 /// 上传文件操作
82 /// 〈/summary〉
83 private void UpLoadFiles()
84 {
85 string filepath = Server.MapPath(“./“)+“UploadFiles“;
86
87 HttpFileCollection uploadedFiles = Request.Files;
88 for (int i = 0; i 〈 uploadedFiles.Count; i++)
89 {
90 HttpPostedFile userPostedFile = uploadedFiles[i];
91 try
92 {
93 if (userPostedFile.ContentLength 〉 0 )
94 {
95 userPostedFile.SaveAs(filepath + “\\“ + System.IO.Path.GetFileName(userPostedFile.FileName));
96 Response.Write(“已上传文件: \““ + filepath +“\\“+ userPostedFile.FileName +“\“〈br〉〈br〉“ );
97 }
98 }
99 catch
100 {
101 Response.Write(“上传文件: \““ + userPostedFile.FileName +“\“出错!“);
102 }
103 }
104 if (Session[“FilesControls“] != null)
105 {
106 Session.Remove(“FilesControls“);
107 }
108 }
109}

(三). 改变上传文件大小和时间限制

〈httpRuntime〉
executionTimeout=“110“ //上传等待时间
maxRequestLength=“4096“ //上传文件大小,默认为4M
〈/httpRuntime〉

上传文件大小是由上面两个参数所决定的. 涉及到安全因素,不要设得太大。