XMLwriter with prefix

如果使用xmlwriter 生成 xslt 文件。

sxlt 文件基本上都是手动书写。但有些时候， 需要程序自动生成次文件。 比较了StringBuilder， XElement 以及 XmlWriter。发现XmlWriter相对来讲， 比较方便。 如下demo：

 

代码

internal   const   string  XSLT_NAMESPACE  =   " http://www.w3.org/1999/XSL/Transform " ;
internal   const   string  SEARCH_RESULT_DEFAULT_NS  =   " http://www.aveva.com/VNET/eiwm " ;
internal   const   string  SEARCH_LIST_NS  =   " http://www.aveva.com/VNET/List " ;
         private   void  WriteTemplateStart(XmlWriter writer)
        {
            writer.WriteStartDocument();

             //  Write xsl:stylesheet need end
            writer.WriteStartElement( " xsl " ,  " stylesheet " , XSLT_NAMESPACE);
            writer.WriteAttributeString( " xmlns " ,  " xsl " ,  null , XSLT_NAMESPACE);
            writer.WriteAttributeString( " xmlns " ,  " v " ,  null , SEARCH_RESULT_DEFAULT_NS);
            writer.WriteAttributeString( " xmlns " ,  " vl " ,  null , SEARCH_LIST_NS);
            writer.WriteAttributeString( " exclude-result-prefixes " ,  " v vl " );
            writer.WriteAttributeString( " version " ,  " 1.0 " );

             //  Write xsl:output
            writer.WriteStartElement( " xsl " ,  " output " , XSLT_NAMESPACE);
            writer.WriteAttributeString( " method " ,  " xml " );
            writer.WriteAttributeString( " indent " ,  " yes " );
            writer.WriteEndElement();

             //  write xsl:template
            writer.WriteStartElement( " xsl " ,  " template " , XSLT_NAMESPACE);
            writer.WriteAttributeString( " match " ,  " vl:VNETList " );
            writer.WriteStartElement( " xsl " ,  " apply-templates " , XSLT_NAMESPACE);
            writer.WriteAttributeString( " select " ,  " v:Template " );
            writer.WriteEndElement();
            writer.WriteEndElement();

             //  Write xsl:template need end
            writer.WriteStartElement( " xsl " ,  " template " , XSLT_NAMESPACE);
            writer.WriteAttributeString( " match " ,  " v:Template " );
             //  Write vl:VNETList need end
            writer.WriteStartElement( " vl " ,  " VNETList " , SEARCH_LIST_NS);
            writer.WriteAttributeString( " xmlns " ,  "" ,  null , SEARCH_RESULT_DEFAULT_NS);
            writer.WriteAttributeString( " xmlns " ,  " vl " ,  null , SEARCH_LIST_NS);
             //  Write Template need end
            writer.WriteStartElement( " Template " );
        }

 

 

基本上都是用了 “prefex”。 和一般的xml 没有很大的区别。

当然， 对有namespace的xml文件， 在使用xpath 的时候， 必须的把xpath 转化为含有namespace 的path，否则找不到对应的节点。转化函数如下：

 

代码

         public   string  TransferXpathToEIWMFormat( string  xpath)
        {
             //  If the xpath contains 'v:' flag, remove them first. then add
             //  together.
            xpath  =  xpath.Replace( " v: " ,  string .Empty);

             //  If the xpath end with '/'. removed.
             if  (xpath.EndsWith( " / " ))
                xpath  =  xpath.Remove(xpath.Length  -   1 );

            Regex startedWithChar  =   new  Regex( @" ^\w " );
             if  (startedWithChar.IsMatch(xpath))
                xpath  =   " ./ "   +  xpath;

            Regex splashRegex  =   new  Regex( @" (/{1,2}) " );
            Regex elementRegex  =   new  Regex( @" (\[)([^\@]\w*) " );
            Regex attributeRegex  =   new  Regex( @" (\[\@) " );

            xpath  =  splashRegex.Replace(xpath,  " $1v: " );
             // xpath = attributeRegex.Replace(xpath, "$1v:");
            xpath  =  elementRegex.Replace(xpath,  " $1v:$2 "  );

             return  xpath;
        }