学步园

Definition comparer class,

class ItemComparer : IEqualityComparer<XElement><br /> {<br /> public bool Equals(XElement x, XElement y)<br /> {<br /> return x.Attribute("Name").Value == x.Attribute("Name").Value;<br /> }</p> <p> public int GetHashCode(XElement obj)<br /> {<br /> return obj.Attribute("Name").Value.GetHashCode();<br /> }<br /> }

How to use this one to distinct:

public List<string> LoadDistrict(string region)<br /> {<br /> if (m_DataDoc == null)<br /> return null;</p> <p> List<string> list = new List<string>();<br /> try<br /> {<br /> var query = from r in m_DataDoc.Elements("DashBoardData").Elements("LevelData").Elements("Region").Where(a => a.Attribute("Name").Value.ToLower() == region.ToLower())<br /> select r;</p> <p> foreach (var district in query.Elements("District").Distinct(new ItemComparer()))<br /> {<br /> list.Add(district.Attribute("Name").Value);<br /> }<br /> return list;<br /> }<br /> catch (Exception exp)<br /> {<br /> MessageBox.Show(exp.Message);<br /> return null;<br /> }<br /> }