[英]Root element is missing. exception
我想使用linq to xml創建xml文件,像這樣
<?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>
我嘗試此代碼,但給我一個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);
}
}
}
您可以簡單地保存root的XElement
。 創建新的xml文件時,您無需加載任何內容:
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);
}
}
}
如果要使用XDocument(在您的情況下不需要),則只需創建新的XDocument而不是加載不存在的文件:
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,您嘗試使用XDocument.Load()“讀取/解析”一個新的空文檔。
File.Create(path).Close();
XDocument document = XDocument.Load(path);
和XDocument.Load()
一個正確的xml文件...他沒有(文件為空)!
所以你可以做
var document = new XDocument();
//...
document.Save(path);
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