MVC2.0本地化（另类解决方案）<上>

     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

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       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：

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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 Dictionary<string, string> ReadLocalizationResource()        {            string _XMLPath = "";              Dictionary<string, string> cacheData = null;            if (cacheData != null)            {                return cacheData;            }            Dictionary<string, string> cachedData = new Dictionary<string, 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 List<string> { _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 (Dictionary<string, 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

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在global.asax中加入以下代码：

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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

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截图如下：

OK,一切准备就绪，我们在不用Response.Filter 过滤的情况下，运行截图如下：

使用上文中Response.Filter过滤后：

结果将第三点中的XML作为传统的资源文件后本地化了MVC View 页面。

 

   四、小结

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    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。

 

希望本篇文章可以给您带来帮助，如有不足之处欢迎指出，谢谢！