在xml表达式中使用循环foreach

帮帮我吧!我需要创建xml文件。我将xml文件中的元素从文本文件中分离出来(config screenos juniper)。我想取关键词，也就是节点和它的元素。

我想实现这样的输出(xml文件):

<VR1>
   <...>
</VR1>
<VR2>
   <...>
</VR2>
<VR3>
   <...>
</VR3>   

但是我只有这样的输出:

    <VR3>
       <...>
   </VR3> 

这样的代码:

                foreach (var match in myCollection)
            {
                StringWriter stringwriter = new StringWriter();
                XmlTextWriter xmlTextWriter = new XmlTextWriter(stringwriter);
                xmlTextWriter.Formatting = Formatting.Indented;
                xmlTextWriter.WriteStartDocument();
                xmlTextWriter.WriteStartElement(match);
                ;
                             ...
                             ...
                xmlTextWriter.WriteEndElement();
                xmlTextWriter.WriteEndDocument();
                XmlDocument docSave = new XmlDocument();
                docSave.LoadXml(stringwriter.ToString());
                //write the path where you want to save the Xml file
                docSave.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() +"Roting.xml");
            }

这里myCollection包含:VR1,VR2,VR3。很明显，我使用loop foreach是错误的，但我不明白如何在这种情况下正确使用它。

            StringWriter stringwriter = new StringWriter();
            XmlTextWriter xmlTextWriter = new XmlTextWriter(stringwriter);
            xmlTextWriter.Formatting = Formatting.Indented;
            xmlTextWriter.WriteStartDocument();           
        foreach (var match in myCollection)
        {

            xmlTextWriter.WriteStartElement(match);
            ;
                         ...
                         ...
            xmlTextWriter.WriteEndElement();
        }
            xmlTextWriter.WriteEndDocument();
            XmlDocument docSave = new XmlDocument();
            docSave.LoadXml(stringwriter.ToString());
            //write the path where you want to save the Xml file
            docSave.Save(AppDomain.CurrentDomain.BaseDirectory.ToString() +"Roting.xml");