Introduction to ASP. NET Image Generation

ASP. NET Image Generation has the built-in ImageResizeTransform class, which allows you to adjust the Image size.

You can also extend ImageTransform to implement your own image conversion class.

The following code uses the ASP. NET Image Generation watermark:

 
 

  
  
usingSystem;  
  
  
usingSystem.Collections.Generic;  
  
  
usingSystem.Linq;  
  
  
usingSystem.Web;  
  
  
usingMicrosoft.Web;  
  
  
usingSystem.Collections.Specialized;  
  
  
usingSystem.Data.SqlClient;  
  
  
usingSystem.Drawing;  
  
  
 
  
  
namespaceNET35Lab.GeneratedImage.Web  
  
  
{  
  
  
 
  
  
publicclassImageHandler1:ImageHandler  
  
  
{  
  
  
 
  
  
publicImageHandler1()  
  
  
{  
  
  
this.ImageTransforms.Add(newImageResizeTransform
{Width=320,Mode=ImageResizeMode.Fit});  
  
  
this.ImageTransforms.Add(newCopyrightTransform{Text="Guushuuse.NET"});  
  
  
this.EnableClientCache=true;  
  
  
this.EnableServerCache=true;  
  
  
 
  
  
}  
  
  
 
  
  
publicoverrideImageInfoGenerateImage(NameValueCollectionparameters)  
  
  
{  
  
  
 
  
  
intintimageID=int.Parse(parameters["imageid"]);  
  
  
 
  
  
SqlConnectionconnection=newSqlConnection(  
  
  
@"DataSource=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.
mdf;IntegratedSecurity=True;UserInstance=True;");  
  
  
 
  
  
connection.Open();  
  
  
 
  
  
SqlCommandcommand=newSqlCommand
("selectimage_datafromt_imageswhereimage_id="+imageID,connection);  
  
  
 
  
  
SqlDataReaderdr=command.ExecuteReader();  
  
  
 
  
  
dr.Read();  
  
  
 
  
  
returnnewImageInfo((Byte[])dr[0]);  
  
  
 
  
  
}  
  
  
}  
  
  
 
  
  
publicclassCopyrightTransform:ImageTransform  
  
  
{  
  
  
privateconstintVERTICAL_PADDING=5;  
  
  
privateconstintHORIZONAL_PADDING=5;  
  
  
 
  
  
publicstringText{get;set;}  
  
  
publicFontFont{get;set;}  
  
  
publicColorFontColor{get;set;}  
  
  
 
  
  
publicCopyrightTransform()  
  
  
{  
  
  
//AssignDefaults  
  
  
FontColor=Color.FromArgb(128,255,0,0);  
  
  
Font=newFont("Courier",13);  
  
  
}  
  
  
 
  
  
 
  
  
publicoverrideSystem.Drawing.ImageProcessImage(System.Drawing.Imageimg)  
  
  
{  
  
  
GraphicsGraphicsgra=Graphics.FromImage(img);  
  
  
SizeFsz=gra.MeasureString(Text,Font);  
  
  
gra.DrawString(Text,Font,newSolidBrush(FontColor),
img.Width-sz.Width-HORIZONAL_PADDING,img.Height-sz.Height-VERTICAL_PADDING);  
  
  
returnimg;  
  
  
}  
  
  
 
  
  
publicoverridestringUniqueString  
  
  
{  
  
  
get  
  
  
{  
  
  
returnbase.UniqueString+Text+FontColor.ToString()+Font.ToString();  
  
  
}  
  
  
}  
  
  
}  
  
  
} 
 
 

The above describes ASP. NET Image Generation.

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