尝试使用 C# 从文件读取和写入时 WPF 出错

Question

So I am trying to read and write from/in .xml file and I get this error:

'System.Xml.Linq.XDocument' does not contain a definition for 'load' and no extension method 'load' accepting a first argument of type 'System.Xml.Linq.XDocument' could be found (are you missing a using directive or an assembly reference?) 

for line:

document.load("MyXmlFile.xml");

Code Sample:

using System.Xml.Linq;      // I included this for XDocument
using System.Xml.XPath;     // I included this because I thought it will fix a problem

public partial class MainWindow : Window
{
    public MainWindow() => InitializeComponent();

    public void LoadXML()
    {
        var document = new XDocument();

        if (!File.Exists("MyXmlFile.xml"))
             document.Save("MyXmlFile.xml");
        else document.load("MyXmlFile.xml");
    }
}

Answer 1

You have to change your method a little:

if (!File.Exists("MyXmlFile.xml"))
{
    document.Save("MyXmlFile.xml");
}
else
{
    //We know it exists so we can load it
    document = XDocument.Load("MyXmlFile.xml"); // changed
}

//Continue to work with document