用C#写XML类型的配置文件：

1.首先要知道xml的格式标准。<?xml version="1.0" encoding="GB2312"?> 。  <?表示指令的开始；xml声明版本为1.0，编码类型

2. C#写xml配置文件

 用到system.xml类库中的 XmlTextWriter类。例如下面：

XmlTextWriter lXmlWriter = new XmlTextWriter(lFileName, null);-----------------------------------------新建写xml的对象lXmlWriter
            lXmlWriter.Formatting = Formatting.Indented;-----------------------------------------------------格式化xml文件开头部分，必须有
            lXmlWriter.WriteStartDocument();-------------------------------------------------------WriteStartDocument开始写xml文件，必须有
            lXmlWriter.WriteStartElement("BandConfig");----------------------------------------第一个WriteStartElement（），是写的根节点

            for (int i = 0; i < mConfigs.Count(); ++i)
            {
                //节点开始
                lXmlWriter.WriteStartElement("Band");--------------------------------------------再次写WriteStartElement（）就是根节点的子节点了
                lXmlWriter.WriteElementString("BandWidth",XmlConvert.ToString(mConfigs[i].BandWidth));子节点中的元素WriteElementString
                lXmlWriter.WriteElementString("BandColor",(mConfigs[i].PenColor.ToArgb().ToString()));
                lXmlWriter.WriteElementString("BandLine",XmlConvert.ToString(mConfigs[i].PenWidth));
                //节点结束
                lXmlWriter.WriteEndElement();----------与lXmlWriter.WriteStartElement("Band"）对应。，必须有
            }
            lXmlWriter.WriteEndElement();------------与 lXmlWriter.WriteStartElement("BandConfig"）对应，必须要
            lXmlWriter.Close();---------------------------与lXmlWriter.WriteStartDocument()对应，必须有