Asp.net 2.0 用 FileUpload 控件实现多文件上传 用户控件(示例代码下载)

2006年04月30日 22:19:00

学习, And 整理了一下.

(一). 示例图片

(二). 示例代码

1 public 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" //允许上传文件最大等待时间
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,最好不要设得太大.

(四). 示例源代码下载

http://www.cnblogs.com/Files/ChengKing/UpMultiFileControl.rar

(五).控件缺点

由于安全原因， 用服务端控件实现，回发时选择的文件不能够保存.

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