ASP.NET Image Generation介绍

ASP.NET Image Generation介绍2011-01-02 博客园 guushuuse随着微软不断扩大开放源代码规模，Codeplex上最热门的项目就是ASP.NET。

在ASP.NET WebForms下有个ASP.NET Image Generation子项目，为ASP.NET项目里处理图片带来了便利。

项目简介：ASP.NET Image Generation is a speedy way of generating, transforming, caching images in ASP.net

下载：http://aspnet.codeplex.com/Wiki/View.aspx？title=Image%20Generation&referringTitle=Home

.Net Framework：3.5

代码示例：

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_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">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <cc1:GeneratedImage ID="GeneratedImage1"
            runat="server" ImageHandlerUrl="~/TextImageHandler.ashx" >
            <Parameters>
                <cc1:ImageParameter Name="Hello" Value="text in an image" />
            </Parameters>
        </cc1:GeneratedImage>
    </div>
    </form>
</body>
</html>

TextImageHandler.ashx

<%@ WebHandler Language="C#" Class="TextImageHandler" %>

using System;
using System.Collections.Specialized;
using System.Drawing;
using System.Web;
using Microsoft.Web;

public class TextImageHandler : ImageHandler {

    public TextImageHandler（） {
        this.ContentType = System.Drawing.Imaging.ImageFormat.Png;
    }

    public override ImageInfo GenerateImage（NameValueCollection parameters） {
        // Add image generation logic here and return an instance of ImageInfo
        Bitmap bit = new Bitmap（300, 60）;
        Graphics gra = Graphics.FromImage（bit）;
        gra.Clear（Color.AliceBlue）;
        gra.DrawString（parameters["Hello"], new Font（FontFamily.GenericSansSerif, 16）, Brushes.Black, 0, 0）;

        return new ImageInfo（bit）;
    }
}

运行效果