Use the FileUpload control to upload pictures and automatically generate thumbnails, automatically generate a watermark with text and pictures (original)

 Posted on 2006-05-05 12:55 0 Reading (3146) Comments (9) Edit favorite References NET picks belong to Category: asp.net2.0--> This article uses the FileUpload control in vs2005 to realize the upload of picture files and generate thumbnails.
Implementation process: Choose the image upload success, get already existing server file generation thumbnail, and judge whether it is a picture type of file, this judgment can be modified in the program, this procedure just judged the "image/bmp", "Image/gif", "Image/pjpeg" three different types.
The code is as follows:
upfile.aspx file
<% @ Page language= "C #" autoeventwireup= "true" codefile= "Upfile.aspx.cs" inherits= "Upfile_upfile"%>

<! 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 > Untitled page </title >
< BODY >
< form ID = "Form1" runat = "server" >
< div >
< Asp:fileupload ID = "FileUpload1" runat = "server"/>
< Asp:button ID = "Button1" runat = "server" OnClick = "Button1_Click" Text = "Upload"/>< br/>
< Asp:label ID = "Label1" runat = "server" ></Asp:label ></div >
</form >
</Body >
</HTML >
Upfile.aspx.cs file
Using System;
Using System.Data;
Using System.Configuration;
Using System.Collections;
Using System.Web;
Using System.Web.Security;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.WebControls.WebParts;
Using System.Web.UI.HtmlControls;
Using System.IO;

public partial class Upfile_upfile:System.Web.UI.Page
{
protected void Page_Load (object sender, EventArgs e)
{ }

protected void Button1_Click (object sender, EventArgs e)
{
if (fileupload1.hasfile)
{
string filecontenttype = FileUpload1.PostedFile.ContentType;
if (Filecontenttype = = "Image/bmp" | | | filecontenttype = "Image/gif" | | filecontenttype = "IMAGE/PJPEG")
{
String name = FileUpload1.PostedFile.FileName; Client file path

FileInfo file = new FileInfo (name);
String fileName = file.                                    Name; File name
String filename_s = "S_" + file.                           Name; Thumbnail file name