Displays a text box control and a browse button that allows the user to select files to upload to the server. namespaces: System.Web.UI.WebControls
Assemblies: System.Web (in System.Web.dll)
Instance:
HTML code:
<%@ page language= "C #" autoeventwireup= "true" codebehind= "Default.aspx.cs" inherits= "Inputfile._default"%>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<title> Untitled Page </title>
<script language= "javascript" type= "Text/javascript" >
<! cdata[
]]>
</script>
<style type= "Text/css" >
. style1
{
Text-align:center;
}
#form1
{
Text-align:center;
}
</style>
<body>
<form id= "Form1" runat= "Server" method= "POST" enctype= "Multipart/form-data" >
<div style= "position:static;" >
<div class= "Style1" >
Presentation File Upload Control
</div>
<div class= "Style1" >
<asp:fileupload id= "File1" runat= "Server"/>
<asp:button id= "uploadbtn" runat= "Server" onclick= "button1_click" text= "Upload"/>
</div>
</div>
<asp:label id= "Label1" runat= "Server"
Width= "437px" height= "61px" ></asp:Label>
</form>
</body>
Background code:
Using System;
Using System.Collections;
Using System.Configuration;
Using System.Data;
Using System.Linq;
Using System.Web;
Using System.Web.Security;
Using System.Web.UI;
Using System.Web.UI.HtmlControls;
Using System.Web.UI.WebControls;
Using System.Web.UI.WebControls.WebParts;
Using System.Xml.Linq;
Namespace Inputfile
{
public partial class _default:system.web.ui.page
{
protected void Page_Load (object sender, EventArgs e)
{
}
protected void Button1_Click (object sender, EventArgs e)
{//Get file information
string FileName = File1.PostedFile.FileName;
String file_str = "file name:" + FileName + "<br>";
file_str= "File type: +file1.postedfile.contenttype+" <br> ";
file_str= "File Length:" +file1.postedfile.contentlength.tostring () + "kb<br>";
Uploading files to the server
filename = filename.substring (filename.lastindexof ("\ \") + 1);//Remove the path to the filename (excluding the file name)
String upload_file = Server.MapPath ("./upload/") + filename;//Remove server virtual path, store upload file
File1.PostedFile.SaveAs (upload_file);//Start uploading files
Label1.Text =file_str+ "Upload file Success";
}
}
}
Common Properties:
(1) Fileupload1.hasfile is used to check whether the FileUpload has a specified file.
(2) HttpContext.Current.Request.MapPath ("~/") is to obtain the site of the disk absolute path, such as the D:\Inetpub\ServerControls\ path, the reason to do so, Because the FileUpload control must specify an absolute path, not a relative path, and the absolute path must also have write permissions.
(3) Fileupload1.saveas () is the way to store the uploaded file on disk.
(4) Fileupload1.filename is used to get the upload file name.
(5) FileUpload1.PostedFile.ContentLength is used to set or get the upload file size, in bytes.
(6) FileUpload1.PostedFile.ContentType to set or get the type of upload file
Instance:
Upload complete:
This article is from the "Shenzhou Dragon" blog, please be sure to keep this source http://shenzhoulong.blog.51cto.com/1191789/30313
C # ASP. NET FileUpload Detailed
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