缺少根元素.例外

本文关键字：例外 元素 | 更新日期: 2023-09-27 17:55:34

我想像这样使用 linq to xml 创建 XML 文件 

<?xml version="1.0" encoding="utf-8"?>
<Configuration>
  <Settings>
    <UseStreemCodec value="false" />
    <SipPort value="5060"/>
    <H323Port value="1720" />
  </Settings>
  <IncomingCallsConfiguration>
  </IncomingCallsConfiguration>
  <OutGoingCallsConfiguration>
    <Devices>
    </Devices>
  </OutGoingCallsConfiguration>
  </Configuration>
我

尝试此代码，但给了我一个Root element is missing.例外 

public void CreatXmlConfigurationFileIfNotFoundWithDefultTags(string path)
        {
            if (!File.Exists(path))
            {
                try
                {
                    File.Create(path).Close();
                    XDocument document = XDocument.Load(path);
                    var setting = new XElement("Settings",
                        new XElement("UseStreemCodec", new XAttribute("value", "false")),
                        new XElement("SipPort", new XAttribute("value", "5060")),
                         new XElement("H323Port", new XAttribute("value", "1720"))
                        );
                    document.Add(new XElement("Configuration", setting,
                        new XElement("IncomingCallsConfiguration"),
                        new XElement("OutGoingCallsConfiguration")));
                    document.Save(path);
                }
                catch (Exception e)
                {
                    Trace.WriteLineIf(Logger.logSwitch.TraceError, e.Message);
                }
            }
        }

缺少根元素.例外

您可以简单地保存XElement这是root。而且在创建新的 xml 文件时，您无需加载任何内容：

public void CreatXmlConfigurationFileIfNotFoundWithDefultTags(string path)
{
    if (!File.Exists(path))
    {
        try
        {
            var setting = new XElement("Settings",
                new XElement("UseStreemCodec", new XAttribute("value", "false")),
                new XElement("SipPort", new XAttribute("value", "5060")),
                new XElement("H323Port", new XAttribute("value", "1720"))
              );
            var config = new XElement("Configuration", setting,
                new XElement("IncomingCallsConfiguration"),
                new XElement("OutGoingCallsConfiguration")));
            config.Save(path); // save XElement to file
        }
        catch (Exception e)
        {
            Trace.WriteLineIf(Logger.logSwitch.TraceError, e.Message);
        }
    }
}
如果你想使用XDocument

（在你的情况下不需要），那么只需创建新的XDocument，而不是加载不存在的文件：

XDocument document = new XDocument();
var setting = new XElement("Settings",
    new XElement("UseStreemCodec", new XAttribute("value", "false")),
    new XElement("SipPort", new XAttribute("value", "5060")),
        new XElement("H323Port", new XAttribute("value", "1720"))
    );
document.Add(new XElement("Configuration", setting,
    new XElement("IncomingCallsConfiguration"),
    new XElement("OutGoingCallsConfiguration")));
document.Save(path);

好吧，你尝试用XDocument.Load（）"读取/解析"一个新的空文档

File.Create(path).Close();
XDocument document = XDocument.Load(path);

XDocument.Load()想要一个正确的 XML 文件...他没有（文件为空）！

所以你可以做

var document =  new XDocument();
//...
document.Save(path);
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