Gravatar控件是如何炼成的？

1 comments 2010-9-6 11:18:40 views

上回说了，Gravatar就是Globally Recognized Avatar的缩写,是 http://www.gravatar.com 推出的一项服务，意为“全球通用头像”。如果在Gravatar的服务器上放置了你自己的头像，那么在任何支持Gravatar的blog或者留言本上留言时，只要提供你与这个头像关联的email地址，就能够显示出你的Gravatar头像来。

并且也提供了一个Gravatar Control，但是可能会有许多的人不喜欢用别人写的控件，在这里在写一个简单的也是最主要的Code：

 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
 
namespace Gravatar_Code 
{ 
    public partial class _Default : System.Web.UI.Page 
    { 
        protected void Page_Load(object sender, EventArgs e) 
        { 
 
        } 
 
        protected void Button1_Click(object sender, EventArgs e) 
        { 
            this.Image2.ImageUrl=Gravatar(this.TextBox1.Text.Trim(),80,"x","http://www.jsann.com/image/gravatar/default.jpg","gravatar","gravatar",true); 
        } 
 
        /// <summary> 
        /// Get Gravatar Photo 
        /// </summary> 
        /// <param name="emailAddress">Email Address</param> 
        /// <param name="imageSize">Image Size</param> 
        /// <param name="distinction">Bast Distinction</param> 
        /// <param name="defaultImage">Default Image URL</param> 
        /// <param name="altText">Image Alt Text</param> 
        /// <param name="toolTip">Tool Tip Text</param> 
        /// <param name="isURL">For Image Label Or The Image Label URL</param> 
        /// <returns>The Gravatar Image Or URL</returns> 
        protected string Gravatar(string emailAddress, int imageSize, string distinction, string defaultImage, string altText, string toolTip,bool isURL) 
        { 
            System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); 
            byte[] result = md5.ComputeHash(System.Text.Encoding.ASCII.GetBytes(emailAddress)); 
            System.Text.StringBuilder hash = new System.Text.StringBuilder(); 
            for (int i = 0; i < result.Length; i++) 
            { 
                hash.Append(result[i].ToString("x2")); 
            } 
            System.Text.StringBuilder gravatarImage = new System.Text.StringBuilder(); 
            if (!isURL) 
            { 
                gravatarImage.Append("<img src=\""); 
            } 
            gravatarImage.Append("http://www.gravatar.com/avatar.php?"); 
            gravatarImage.Append("gravatar_id=" + hash.ToString()); 
            gravatarImage.Append("&amp;rating=" + distinction); 
            gravatarImage.Append("&amp;size=" + imageSize); 
            gravatarImage.Append("&amp;default=" + Server.UrlEncode(defaultImage)); 
            if (!isURL) 
            { 
                gravatarImage.Append("\" alt=\"" + altText); 
                gravatarImage.Append("\" title=\"" + toolTip); 
                gravatarImage.Append("\" />"); 
            } 
            return gravatarImage.ToString(); 
        } 
    } 
}
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace Gravatar_Code{    public partial class _Default : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {        }        protected void Button1_Click(object sender, EventArgs e)        {            this.Image2.ImageUrl=Gravatar(this.TextBox1.Text.Trim(),80,"x","http://www.jsann.com/image/gravatar/default.jpg","gravatar","gravatar",true);        }        /// <summary>        /// Get Gravatar Photo        /// </summary>        /// <param name="emailAddress">Email Address</param>        /// <param name="imageSize">Image Size</param>        /// <param name="distinction">Bast Distinction</param>        /// <param name="defaultImage">Default Image URL</param>        /// <param name="altText">Image Alt Text</param>        /// <param name="toolTip">Tool Tip Text</param>        /// <param name="isURL">For Image Label Or The Image Label URL</param>        /// <returns>The Gravatar Image Or URL</returns>        protected string Gravatar(string emailAddress, int imageSize, string distinction, string defaultImage, string altText, string toolTip,bool isURL)        {            System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();            byte[] result = md5.ComputeHash(System.Text.Encoding.ASCII.GetBytes(emailAddress));            System.Text.StringBuilder hash = new System.Text.StringBuilder();            for (int i = 0; i < result.Length; i++)            {                hash.Append(result[i].ToString("x2"));            }            System.Text.StringBuilder gravatarImage = new System.Text.StringBuilder();            if (!isURL)            {                gravatarImage.Append("<img src=\"");            }            gravatarImage.Append("http://www.gravatar.com/avatar.php?");            gravatarImage.Append("gravatar_id=" + hash.ToString());            gravatarImage.Append("&amp;rating=" + distinction);            gravatarImage.Append("&amp;size=" + imageSize);            gravatarImage.Append("&amp;default=" + Server.UrlEncode(defaultImage));            if (!isURL)            {                gravatarImage.Append("\" alt=\"" + altText);                gravatarImage.Append("\" title=\"" + toolTip);                gravatarImage.Append("\" />");            }            return gravatarImage.ToString();        }    }}

其实最主要的代码就是最后一个有注释的方法，很简单，将所提供的Email MD5一下，然后以x2的格式ToString（也就是十六进制的队组格式）就可以了。

测试代码如下：

 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Gravatar_Code._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>Gravatar Code</title> 
    <style type="text/css" runat="server"> 
    div 
    { 
        margin:10px; 
    } 
    #TextBox1
    { 
        border:#CCC solid 1px; 
        width:380px; 
    } 
    #Button1
    { 
        border:#CCC solid 1px; 
        background-color:#FFF; 
        width:380px; 
        color:#999; 
    } 
    </style> 
</head> 
<body> 
    <form id="form1" runat="server"> 
    <div> 
        <%=Gravatar("zenwink@gmail.com", 80,"G","http://www.jsann.com/image/gravatar/default.jpg","Gravatar Image","Get Your Gravatar Images",false)%> 
    </div> 
    <div> 
        <asp:Image ID="Image1" runat="server"  
            ImageUrl="http://www.jsann.com/image/gravatar/default.jpg" /> 
    </div> 
    <div> 
        <asp:TextBox ID="TextBox1" runat="server" Text="zenwink@vip.qq.com"></asp:TextBox> 
    </div> 
    <div> 
        <asp:Button ID="Button1" runat="server"  
            Text="Submit The Email Address And Get The Gravatar Hand Image"  
            onclick="Button1_Click" /> 
    </div> 
    <div> 
        <asp:Image ID="Image2" runat="server" /> 
    </div> 
    </form> 
</body> 
</html>
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Gravatar_Code._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>Gravatar Code</title>    <style type="text/css" runat="server">    div    {        margin:10px;    }    #TextBox1    {        border:#CCC solid 1px;        width:380px;    }    #Button1    {        border:#CCC solid 1px;        background-color:#FFF;        width:380px;        color:#999;    }    </style></head><body>    <form id="form1" runat="server">    <div>        <%=Gravatar("zenwink@gmail.com", 80,"G","http://www.jsann.com/image/gravatar/default.jpg","Gravatar Image","Get Your Gravatar Images",false)%>    </div>    <div>        <asp:Image ID="Image1" runat="server"             ImageUrl="http://www.jsann.com/image/gravatar/default.jpg" />    </div>    <div>        <asp:TextBox ID="TextBox1" runat="server" Text="zenwink@vip.qq.com"></asp:TextBox>    </div>    <div>        <asp:Button ID="Button1" runat="server"             Text="Submit The Email Address And Get The Gravatar Hand Image"             onclick="Button1_Click" />    </div>    <div>        <asp:Image ID="Image2" runat="server" />    </div>    </form></body></html>

还是提供个截图，汗，木的办法（同样的，你还是可以在这里下载到源码）。

季氏安安

本文作者：季氏安安（[既是安安]博客采用 BY-NC-SA 协议进行授权. 转载请保留此链接，谢谢。）

原文链接：http://www.jsann.com/post/gravatar_control_code_for_apsdotnet.html

既是后端季氏安安 Gravatar 控件服务器 C# .NET

既是安安

Gravatar控件是如何炼成的？

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