最近项目的一些心得（纯贴代码）

唉，眼看着ASP.NET第一步已经出版2年了，这2年貌似自己进步也不是很大，最近完成了一个项目，分享一点代码吧，以后要复制粘贴自己也方便点，因为主要是给自己看的，大家看不懂别见怪。

1、WCF中统一处理异常，并自动包装为 FaultException 返回给客户端：

先建立这么一个ServiceBehavior特性：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->[AttributeUsage(AttributeTargets.Class,AllowMultiple=false,Inherited=false)]
publicsealedclassErrorHandlingBehaviorAttribute:Attribute,IServiceBehavior
{
#regionIServiceBehaviorMembers

publicvoidAddBindingParameters(ServiceDescriptionserviceDescription,System.ServiceModel.ServiceHostBaseserviceHostBase,System.Collections.ObjectModel.Collection<ServiceEndpoint>endpoints,System.ServiceModel.Channels.BindingParameterCollectionbindingParameters)
{

}

publicvoidApplyDispatchBehavior(ServiceDescriptionserviceDescription,System.ServiceModel.ServiceHostBaseserviceHostBase)
{
IErrorHandlerhandler=newErrorHandler();

foreach(ChannelDispatcherdispatcherinserviceHostBase.ChannelDispatchers)
{
dispatcher.ErrorHandlers.Add(handler);
}
}

publicvoidValidate(ServiceDescriptionserviceDescription,System.ServiceModel.ServiceHostBaseserviceHostBase)
{

}

#endregion
}

然后呢，需要实现啊这么一个自定义的ErrorHandler：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->publicclassErrorHandler:IErrorHandler
{
#regionIErrorHandlerMembers

///<summary>
///Logexception
///</summary>
///<paramname="error"></param>
///<returns></returns>
publicboolHandleError(Exceptionerror)
{
//Ignorecommunicationexception,onlylogbusinesslogicexception
if(errorisCommunicationException)
returntrue;

Log.LogException(error);
returntrue;
}

///<summary>
///WarpExceptionwithFaultException
///</summary>
///<paramname="error"></param>
///<paramname="version"></param>
///<paramname="fault"></param>
publicvoidProvideFault(Exceptionerror,MessageVersionversion,refMessagefault)
{
FaultExceptionfaultException=newFaultException(error.Message);
MessageFaultm=faultException.CreateMessageFault();
fault=Message.CreateMessage(version,m,faultException.Action);
}

#endregion
}

Log类代码就不写了，爱怎么记录就怎么记录，最后只要把这个特性应用到Service的类上即可。

2、把XML结构转换为span包装的HTML，这样就可以直接为XML的各个层次应用样式啦：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->///<summary>
///Convert<infs><inf>a</inf><inf>b</inf></infs>to<spanclass="infs"><spanclass="inf">a</span><spanclass="inf">b</span></span>
///</summary>
///<paramname="xml"></param>
///<returns></returns>
publicstaticstringConvertXmlToHtml(thisstringxml)
{
if(string.IsNullOrEmpty(xml))
returnstring.Empty;

XElementroot=XElement.Parse(string.Format("<root>{0}</root>",xml));

foreach(varelinroot.DescendantsAndSelf())
el.AddAnnotation(
newXElement("span",
newXElement("ApplyTransforms"),
newXAttribute("class",el.Name)
)
);

XElementnewRoot=XForm(root);
returnnewRoot.ToString();
}

XForm的代码如下：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->privatestaticXElementXForm(XElementsource)
{
if(source.Name=="a")returnsource;

if(source.Annotation<XElement>()!=null)
{
XElementanno=source.Annotation<XElement>();
returnnewXElement(anno.Name,
anno.Attributes(),
anno.Nodes().Select((XNoden)=>
{
XElementannoEl=nasXElement;
if(annoEl!=null)
{
return(object)(source.Nodes().Select((XNoden2)=>
{
XElemente2=n2asXElement;
if(e2==null)
returnn2;
else
returnXForm(e2);
}));
}
else
returnn;
})
);
}
else
{
returnnewXElement(source.Name,
source.Attributes(),
source.Nodes().Select(n=>
{
XElementel=nasXElement;
if(el==null)
returnn;
else
returnXForm(el);
})
);
}
}

3、LINQ TO XML来更新和删除XML：

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->///<summary>
///Removeunwantedembeddedtranslationaccordingtoculturecode
///</summary>
///<paramname="text"></param>
///<paramname="cultureCode"></param>
///<returns></returns>
publicstaticstringRemoveTranslationFromNotePanel(stringtext,stringcultureCode)
{
varxml=XDocument.Parse(text);
vartranslationList=fromtinxml.Descendants("trans")
selectt;
if(cultureCode=="cs")
translationList=translationList.Where(t=>t.Attribute("lang").Value=="CN");
if(cultureCode=="ch")
translationList=translationList.Where(t=>t.Attribute("lang").Value=="CNS");
translationList.Remove();

returnxml.ToString();
}

///<summary>
///Separateouttitleinnotepanelxml
///</summary>
///<paramname="text"></param>
///<paramname="title"></param>
///<returns></returns>
publicstaticstringRemoteTitleFromNotePanelAndGetTitle(stringtext,refstringtitle)
{
varxml=XDocument.Parse(text);
vartitleElement=(fromtinxml.Descendants("title")selectt).FirstOrDefault();
if(titleElement!=null)
{
title=titleElement.Value;
titleElement.Remove();
}
returnxml.ToString();
}

///<summary>
///Handle<gl></gl>,<nondv></nondv>and<x></x>tags
///</summary>
///<paramname="text"></param>
///<returns></returns>
publicstaticstringFormatSenseDefinition(stringtext)
{
varxml=XDocument.Parse(text);

//<gl>contenthere</gl>-><gl>(=contenthere)</gl>
varglTag=(fromtinxml.Descendants("gl")selectt).ToList();
glTag.ForEach(gl=>gl.Value=string.Format("(={0})",gl.Value));

//<xrefurl="guidewordblock_id">contenthere</x>-><xrefurl="guidewordblock_id"><atitle="headword">contenthere</a></x>
varxTag=(fromtinxml.Descendants("x")wheret.Attribute("refurl")!=nullselectt).ToList();
for(inti=0;i<xTag.Count;i++)
{
varx=xTag[i];
intguidewordID=0;
if(int.TryParse(x.Attribute("refurl").Value,outguidewordID))
{
if(guidewordID!=0)
{
varheadwordText=ContentHelper.GetHeadwordTextFromGuidewordID(guidewordID);
if(!string.IsNullOrEmpty(headwordText))
{
x.ReplaceAll(newXElement("a",x.Value,newXAttribute("title",headwordText)));
}
}
else
x.ReplaceAll(newXElement("a",x.Value,newXAttribute("title",x.Value)));
}
}

//<nondvrefurl="guidewordblock_id">contenthere</nondv>-><nondvrefurl="guidewordblock_id"><atitle="headword">contenthere</a></nondv>
varnondvTag=(fromtinxml.Descendants("nondv")wheret.Attribute("refurl")!=nullselectt).ToList();
for(inti=0;i<nondvTag.Count;i++)
{
varnondv=nondvTag[i];
intguidewordID=0;
if(int.TryParse(nondv.Attribute("refurl").Value,outguidewordID))
{
if(guidewordID!=0)
{
varheadwordText=ContentHelper.GetHeadwordTextFromGuidewordID(guidewordID);
if(!string.IsNullOrEmpty(headwordText))
{
nondv.ReplaceAll(newXElement("a",nondv.Value,newXAttribute("title",headwordText)));
}
}
else
nondv.ReplaceAll(newXElement("a",nondv.Value,newXAttribute("title",nondv.Value)));
}
};

returnxml.ToString();
}