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ASP. net2.0 image format conversion [original month]

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Author: User
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 ASP. NET2.0 image format conversion

Author: qingyueer

Home page:Http://blog.csdn.net/21aspnet/Time: 2007.4.20

Note: This article implements
Convert the image format as needed (select from the drop-down list );
Click FileUpload to immediately display the image (Js implementation) skills;

 

Step 1: Open the page

Step 2: select a Jpg image

Step 3: convert to the GIF format to see that the image quality is reduced.

Background code:

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;
Using System. Drawing;
Public partial class _ Default: System. Web. UI. Page
{
Protected void Page_Load (object sender, EventArgs e)
{
}
Protected void button#click (object sender, EventArgs e)
{
String filepath = FileUpload1.PostedFile. FileName;
String filename = filepath. Substring (filepath. LastIndexOf ("//") + 1 );
String serverpath = Server. mapPath ("images/") + System. dateTime. now. toString ("yyy-MM-dd-hh-mm-ss") + Session. sessionID + filename;

If (DropDownList1.SelectedValue = "GIF ")
{
ConvertImage (FileUpload1.PostedFile. FileName, System. Drawing. Imaging. ImageFormat. Gif, serverpath + ". gif ");
}
Else if (DropDownList1.SelectedValue = "Jpeg ")
{
ConvertImage (FileUpload1.PostedFile. FileName, System. Drawing. Imaging. ImageFormat. Jpeg, serverpath + ". jpg ");
}
Else if (DropDownList1.SelectedValue = "Bmp ")
{
ConvertImage (FileUpload1.PostedFile. FileName, System. Drawing. Imaging. ImageFormat. Bmp, serverpath + ". bmp ");
}
Else
{
// Clear moon left for everyone http://blog.csdn.net/21aspnet
}
}

Public void ConvertImage (string Filename, System. Drawing. Imaging. ImageFormat DesiredFormat, string NewFilename)
{
Try
{
System. Drawing. Image imgFile = System. Drawing. Image. FromFile (Filename );
ImgFile. Save (NewFilename, DesiredFormat );
Image1.ImageUrl = NewFilename;
Label1.Text = "converted successfully, generate" + NewFilename + ", as shown below. ";
TextBox1.Text = "1 ";//Starts from 0, and is converted to 1
}
Catch (exception ex)
{
Response. Write (Ex );
}
}

}

 

Front-end code:
<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>

<! 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> image format conversion </title>
<Script language = "JavaScript">
Function show_img ()//The image is displayed to the customer immediately after the image is selected.
{

If (document. All. textbox1.value = "0 "){//Starts from 0, and is converted to 1
Document. All. image1.src = Document. All. fileupload1.value;
}
Else if (document. All. textbox1.value = "1 ")
{
}
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
& Nbsp;
<Table>
<Tr>
<Td style = "width: 124px">
<Asp: FileUpload ID = "FileUpload1" runat = "server"Onmouseover = "show_img ()"Width = "349px"/> & nbsp;
</Td>
<Td style = "width: 100px">
Format <asp: DropDownList ID = "DropDownList1" runat = "server">
<Asp: listitem> GIF </ASP: listitem>
<Asp: listitem> JPEG </ASP: listitem>
<Asp: listitem> BMP </ASP: listitem>
<Asp: listitem> PNG </ASP: listitem>
<Asp: listitem> ICO </ASP: listitem>
</ASP: dropdownlist>
</TD>
<TD style = "width: 100px">
<Asp: button id = "button1" runat = "server" onclick = "button#click" text = ""/> </TD>
<TD style = "width: 100px">
<Asp: textbox id = "textbox1" runat = "server"> 0 </ASP: textbox>
</Td>
</Tr>
<Tr>
<Td colspan = "4">
& Nbsp; <asp: Label ID = "Label1" runat = "server"> </asp: Label> </td>
</Tr>
<Tr>
<Td style = "height: 26px;" colspan = "4">
<Asp: Image ID = "Image1" runat = "server"/> </td>
</Tr>
</Table>

</Div>
</Form>
</Body>
</Html>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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