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ASP. NET multi-File Upload instance

Source: Internet
Author: User
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In Web application development, you cannot use the file upload function. However, it was a very troublesome task to upload files before. NET now makes File Upload easy. The following example implements the Multifile upload function. You can dynamically add input forms. There is no limit on the number of uploaded files. The Code is as follows:

<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "MultiFileUpload. aspx. cs"

Inherits = "MultiFileUpload" %>

 

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN"

Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>

<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head runat = "server">

<Title> ASP. NET multi-file upload test </title>

 

<Script type = "text/javascript">

Function addFile (){

Var div = document. createElement ("div ");

Var f = document. createElement ("input ");

F. setAttribute ("type", "file ")

F. setAttribute ("name", "File ")

F. setAttribute ("size", "50 ")

Div. appendChild (f)

Var d = document. createElement ("input ");

D. setAttribute ("type", "button ")

D. setAttribute ("onclick", "deteFile (this )");

D. setAttribute ("value", "Remove ")

Div. appendChild (d)

Document. getElementById ("_ container"). appendChild (div );

}

 

Function deteFile (o ){

While (o. tagName! = "DIV") o = o. parentNode;

O. parentNode. removeChild (o );

}

</Script>

 

</Head>

<Body>

<Form id = "form1" runat = "server" method = "post" enctype = "multipart/form-data">

<H3> Multifile upload

Username: <asp: TextBox ID = "TextBox1" runat = "server"> </asp: TextBox>

<Div id = "_ container">

<Input type = "file" size = "50" name = "File"/>

</Div>

<Div>

<Input type = "button" value = "Add file" onclick = "addFile ()"/>

</Div>

<Div <asp: Button runat = "server" Text = "Start upload" ID = "UploadButton"

Onclick = "UploadButton_Click"> </asp: Button>

</Div>

<Div>

<Asp: Label ID = "strStatus" runat = "server" Font-Names = "" Font-Bold = "True" Font-Size = "9pt"

Width = "500px" BorderStyle = "None" BorderColor = "White"> </asp: Label>

</Div>

</Form>

</Body>

</Html>

 

Using System;

Using System. Collections. Generic;

Using System. Linq;

Using System. Web;

Using System. Web. UI;

Using System. Web. UI. WebControls;

 

Public partial class MultiFileUpload: System. Web. UI. Page

{

Protected void UploadButton_Click (object sender, EventArgs e)

{

/// 'Traverse the File form Element

HttpFileCollection files = HttpContext. Current. Request. Files;

 

/// 'Status Information

System. Text. StringBuilder strMsg = new System. Text. StringBuilder ("your username is:" + TextBox1.Text + "<br/> ");

StrMsg. Append ("the uploaded files are:

Try

{

For (int iFile = 0; iFile <files. Count; iFile ++)

{

/// 'Check the extension name of the file

HttpPostedFile postedFile = files [iFile];

String fileName, fileExtension;

FileName = System. IO. Path. GetFileName (postedFile. FileName );

If (fileName! = "")

{

FileExtension = System. IO. Path. GetExtension (fileName );

StrMsg. Append ("type of the uploaded file:" + postedFile. ContentType. ToString () + "<br> ");

StrMsg. Append ("client file address:" + postedFile. FileName + "<br> ");

StrMsg. Append ("file name to be uploaded:" + fileName + "<br> ");

StrMsg. Append ("File Upload Extension:" + fileExtension + "<br>

/// 'Can be saved to different folders based on different extension names

/// Note: you may need to modify the anonymous write permission of your folder.

PostedFile. SaveAs (System. Web. HttpContext. Current. Request. MapPath ("images/") + fileName );

}

}

StrStatus. Text = strMsg. ToString ();

}

Catch (System. Exception Ex)

{

StrStatus. Text = Ex. Message;

}

 

}

}

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