Question

这是我用来按县过滤削片机的SearchFile.xml

<search>

<chipper LName="Nico's Takeaway"
    PlAddress= "Unit 12 River Oaks, Claregalway"
    County="Galway"
    PhoneNumber =" 091 799791"/>

  <chipper LName=" Martino's Takeaway"
    PlAddress= "The Square, Dunmore"
    County ="Galway"
    PhoneNumber="093 39720"/>
  <chipper
    LName="Attico's Takeaway"
    PlAddress="Dunkellin Street, Loughrea"
    County="Galway"
    PhoneNumber="091 871551"/>
  <chipper
    LName="9th Lough"
    PlAddress="1 St Patricks Road, Clondalkin"
    County="Dunlin 22"
    PhoneNumber="01 4573267"/>
  <chipper
    LName="Aldo's Diner"
    PlAddress="Old Bray Road, Cornelscourt, Foxrock"
    County="Dunlin 18"
    PhoneNumber="01 2899226"/>
  <chipper
    LName="Alfredo’s Take Away"
    PlAddress="81 Macroom Road, Coolock"
    County="Dunlin 17"
    PhoneNumber="01 8474641"/>
</search>

这是我的C＃代码，我得到了NullReferenceException 断点出现在find.Attribute（“县”）。值==“戈尔韦”？

 private void newsEventBtn_Click(object sender, RoutedEventArgs e)       
{

XDocument loadedData = XDocument.Load("SearchFile.xml");           
var filteredData = from find in loadedData.Descendants("search")                                                                            
         where find.Attribute("County").Value == "Galway"                             
 select new Chippers()                             
{

        LName = find.Attribute("LName").Value
        //PlAddress = c.Attribute("PAddress").Value,
        //PhoneNumber = c.Attribute("PhoneNumber").Value
};
  listBox.ItemsSource = filteredData;

这是我的削片机类Chippers.cs，我使用存储xml元素值

public class Chippers
    {


        string name;
        string PAddress;
        string county;
        string phoneNumber;

        public string LName
        {
            get { return name; }
            set { name = value; }
        }

        public string PlAddress
        {
            get { return PAddress; }
            set { PAddress = value; }
        }

        public string County
        {
            get { return county; }
            set { county = value; }
        }
        public string PhoneNumber
        {
            get { return phoneNumber; }
            set { phoneNumber = value; }
        }

    }
}

如果有人能告诉我为什么会这样，那将是值得欣赏的感谢

Answer 1

你必须重复'削片机'而不是'搜索'。变化：

var filteredData = from find in loadedData.Descendants("search")

在：

var filteredData = from find in loadedData.Descendants("chipper")

迎接

WP7使用XML：过滤NullReferenceException是未处理的C＃

1 个答案: