The following uses ASP.net image generation to generate a picture thumbnail and watermark code.
Database
The following are the referenced contents:
CREATE TABLE T_images
(
image_id INT,
Image_data IMAGE,
Last_modified_date, DATETIME
)
Default.aspx
The following are the referenced contents:
<%@ Page language= "C #" autoeventwireup= "true" codebehind= "Default.aspx.cs" inherits= "NET35Lab.GeneratedImage.Web" . _default "%>
<%@ Register assembly= "Microsoft.Web.GeneratedImage" namespace= "Microsoft.web" tagprefix= "CC1"%>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<title></title>
<body>
<form id= "Form1" runat= "Server" >
<div>
<asp:datalist id= "DataList1" runat= "Server" datasourceid= "SqlDataSource1" repeatcolumns= "2"
repeatdirection= "Horizontal" cellpadding= "4" cellspacing= "4" >
<ItemTemplate>
<cc1:generatedimage id= "GeneratedImage1" runat= "Server" imagehandlerurl= "~/imagehandler1.ashx"
Timestamp= ' <%# Eval ("last_modified_date")%> ' >
<Parameters>
<cc1:imageparameter name= "imageID" Value= ' <%# Eval ("image_id")%> '/>
</Parameters>
</cc1:GeneratedImage>
<br/>
</ItemTemplate>
</asp:DataList>
</div>
<asp:sqldatasource id= "SqlDataSource1" runat= "Server" connectionstring= "Data source=. SQLEXPRESS; Attachdbfilename=datadirectorydatabase.mdf;integrated security=true; User instance=true; "
Providername= "System.Data.SqlClient" selectcommand= "SELECT [image_id], [Image_data], [last_modified_date] from [t_ Images] ">
</asp:SqlDataSource>
</form>
</body>
Imagehandler1.ashx
The following are the referenced contents:
<%@ WebHandler Language="C#" CodeBehind="ImageHandler1.ashx.cs" Class="NET35Lab.GeneratedImage.Web.ImageHandler1" %>
ImageHandler1.ashx.cs
The following are the referenced contents:
Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Web;
Using Microsoft.web;
Using System.Collections.Specialized;
Using System.Data.SqlClient;
Using System.Drawing;
Namespace NET35Lab.GeneratedImage.Web
{
public class Imagehandler1:imagehandler
{
Public ImageHandler1 ()
{
This. Imagetransforms.add (new Imageresizetransform {Width =, Mode = Imageresizemode.fit});
This. Imagetransforms.add (new Copyrighttransform {Text = "guushuuse. NET"});
This. Enableclientcache = true;
This. Enableservercache = true;
}
public override Imageinfo Generateimage (NameValueCollection parameters)
{
int imageID = Int. Parse (parameters["imageID"]);
SqlConnection connection = new SqlConnection (
@ "Data source=. SQLEXPRESS; Attachdbfilename=datadirectorydatabase.mdf;integrated security=true; User instance=true; ");
Connection. Open ();
SqlCommand command = new SqlCommand ("Select Image_data from T_images where image_id=" + imageID, connection);
SqlDataReader dr = command. ExecuteReader ();
Dr. Read ();
return new Imageinfo ((byte[]) dr[0]);
}
}
public class Copyrighttransform:imagetransform
{
Private Const int vertical_padding = 5;
Private Const int horizonal_padding = 5;
public string Text {get; set;}
Public font font {get; set;}
Public Color FontColor {get; set;}
Public Copyrighttransform ()
{
Assign Defaults
FontColor = Color.FromArgb (128, 255, 0, 0);
Font = new Font ("Courier", 13);
}
public override System.Drawing.Image Processimage (System.Drawing.Image img)
{
Graphics GRA = Graphics.fromimage (IMG);
SizeF SZ = gra. MeasureString (Text, Font);
Gra. DrawString (Text, Font, New SolidBrush (FontColor), IMG. Width-sz. Width-horizonal_padding, IMG. Height-sz. height-vertical_padding);
return img;
}
public override string Uniquestring
{
Get
{
Return base. uniquestring + Text + fontcolor.tostring () + font.tostring ();
}
}
}
}
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