C# XML

OpenFileDialog of = new OpenFileDialog();
of.Filter = "mp3 files (*.mp3)|*.mp3";
if (of.ShowDialog() == DialogResult.OK)
{
txtMusic.Text = of.FileName.ToString();
}

我用这段代码浏览下文件

XmlDocument xmldoc = new XmlDocument();
XmlElement xmlelem = xmldoc.CreateElement("", "Discuss_root", "");
xmldoc.AppendChild(xmlelem);
XmlNode root = xmldoc.SelectSingleNode("Discuss_root");
XmlElement xe = xmldoc.CreateElement("Discuss_Set");
root.AppendChild(xe);
XmlElement xeTitle = xmldoc.CreateElement("Discuss_Title");
xeTitle.InnerText = txttitle.Text.ToString();
xe.AppendChild(xeTitle);
XmlElement xeMusic = xmldoc.CreateElement("Discuss_Music");
xeMusic.InnerText = txtMusic.Text.ToString();
xe.AppendChild(xeMusic);
xmldoc.Save("Discuss.xml");
this.DialogResult = DialogResult.OK;
this.Close();

然后这段保存XML的代码可以正确执行，但是xml文件并没有被修改并保存

public bool SetValue(string node, string value)
{
if (String.IsNullOrEmpty(node))
{
throw new InputInvalidException("参数node为空或者为空字符串");
}

XmlElement xmlElement = (XmlElement)_rootElement.SelectSingleNode(node);
if (xmlElement != null)
{
xmlElement.InnerText = value;

return true;
}
else
{
XmlElement newXmlElement = CreateElement(node);

newXmlElement.InnerText = value;

_xmlDoc.Save(source);

return true;
}
}

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