嘗試使用WinForm和C＃將XML綁定到ComboBox

Question

文件名：location.xml

<?xml version="1.0" encoding="utf-8" ?>
<locations>
  <location id="1" position="Holiday" />
  <location id="2" position="Time Off" />
  <location id="3" position="Training" />
</locations>

我正在嘗試使用位置中的“文本”填充組合框。 該ID暫時不需要。

我的C＃代碼

        var obj = XDocument.Load("location.xml");            
        comboBox1.DisplayMember = "LocationPosition";
        comboBox1.ValueMember = "LocationID";

        comboBox1.DataSource = obj.Descendants("location").Select(x => new
        {
            LocationPosition = x.Attribute("name").Value,
            LocationID = x.Attribute("id").Value
        }).ToList(); // Crashing here

錯誤消息說

System.NullReferenceException was unhandled
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=CalendarSharing
  StackTrace:

Answer 1

那是因為該xml字符串中沒有任何name屬性。

將name更改為position ：

    var obj = XDocument.Load("location.xml");            
    comboBox1.DisplayMember = "LocationPosition";
    comboBox1.ValueMember = "LocationID";

    comboBox1.DataSource = obj.Descendants("location").Select(x => new
    {
        LocationPosition =x.Attribute("position").Value,
        LocationID =  x.Attribute("id").Value
    }).ToList();