浅谈ASP.NET Image Generation

ASP.NET Image Generation内置了ImageResizeTransform类，可以实现图片大小调整功能。

也可以扩展ImageTransform实现自己的图片变换类。

下面使用ASP.NET Image Generation水印的代码：

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();  
}  
}  
}  
} 

以上是介绍ASP.NET Image Generation

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