MVC2.0本地化（另类解决方案）<上>

作者: ryanding 来源: 博客园发布时间: 2011-01-21 00:04 阅读: 1393 次推荐: 0 原文链接 [收藏]

摘要：本文用另外一套方案解决了MVC2.0程序的本地化问题，也适用于asp.net webform。同时本文还存在很多不足的地方，比如后台异步的JSON格式本地化、用户自定义本地化语言等将会在MVC2.0本地化（另类解决方案）下文中得到完善。

　　前不久看见一篇文章：在asp.net中使用Response.Filter 过滤网站敏感字符的解决方案。于是我借题发挥用Response.Filter 为MVC2.0 进行多国语言本地化。如果存在不足的地方，希望您指出。

　　本文主要给出具体思路，希望能给读者带来一定的启发：日常开发中不是所有的方案要中规中矩用常用方法解决问题。比如本文的本地化就不用resource文件来处理。

　　具体步骤：

　　一、建立自定义的LocalizationHandler类

　　LocalizationHandler 继承System.IO.Stream类，LocalizationHandler实例化后赋值给Response.Filter。这里主要通过Response.Filter来本地化MVC2.0程序。具体的Response.Filter 用法请参看MSDN.代码如下：

public class LocalizationHandler : Stream
   {
       private Stream responseStream;
 
       public LocalizationHandler(Stream inputStream)
       {
           responseStream = inputStream;
       }
       public override bool CanRead
       {
           get { return true; }
       }
       public override bool CanSeek
       {
           get { return true; }
       }
       public override bool CanWrite
       {
           get { return true; }
       }
       public override void Flush()
       {
           responseStream.Flush();
       }
       public override long Length
       {
           get { return 0; }
       }
       long postion;
       public override long Position
       {
           get
           {
               return postion;
           }
           set
           {
               postion = value;
           }
       }
       public override int Read(byte[] buffer, int offset, int count)
       {
           return responseStream.Read(buffer, offset, count);
       }
       public override long Seek(long offset, SeekOrigin origin)
       {
           return responseStream.Seek(offset, origin);
       }
       public override void SetLength(long value)
       {
           responseStream.SetLength(value);
       }
       public override void Write(byte[] buffer, int offset, int count)
       {
           string sBuffer = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count);
           string pattern = @"(|)=(.*?)(|)";//正则替换类似页面格式为这样的字符串如：=OtherContent
           sBuffer = Regex.Replace(sBuffer, pattern, delegate(Match c)
           {
               return ReadLocalizationResource().FirstOrDefault(d = d.Key == c.Groups[2].Value).Value;
           });
           ReadLocalizationResource();
           byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(sBuffer);
           responseStream.Write(data, 0, data.Length);
       }
       ObjectCache cache = MemoryCache.Default;
       private Dictionarystring, string ReadLocalizationResource()
       {
           string _XMLPath = "";
           Dictionarystring, string cacheData = null;
           if (cacheData != null)
           {
               return cacheData;
           }
           Dictionarystring, string cachedData = new Dictionarystring, string();
           string serverPath = System.Web.HttpContext.Current.Server.MapPath("~");
           _XMLPath = Path.Combine(serverPath, "LocalizationResource.xml");
           //建立缓存（使用.net4.0最新缓存机制：System.Runtime.Caching;）
           if (cache["myCache"] == null)
           {
               CacheItemPolicy policy = new CacheItemPolicy();
               policy.SlidingExpiration = TimeSpan.FromMinutes(60);
               policy.ChangeMonitors.Add(new HostFileChangeMonitor(new Liststring { _XMLPath }));
               var items = XElement.Load(_XMLPath).Elements("Module").Elements("item");
               foreach (var item in items)
               {
                   string key = item.Attribute("name").Value;
                   string value = item.Value;
                   cachedData.Add(key, value);
               }
               cache.Set("myCache", cachedData, policy);
               return cachedData;
           }
           return (Dictionarystring, string)cache["myCache"];
       }
   }

　　代码中的65行开始，是本地化核心代码，在这里我们用正则匹配文本。用.NET4.0 System.Runtime.Caching;（尝鲜）缓存机制提高程序执行效率。

　　二、修改global.asax文件

　　在global.asax中加入以下代码：

protected void Application_BeginRequest(Object sender, EventArgs e)
        {
            Response.Filter = new LocalizationHandler(Response.Filter);
        }

　　三、建立自定义的XML本地化资源文件

　　截图如下：