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：

 

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：

 

        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;
        }