Linq to XML customize distinct function
Definition comparer class,
class ItemComparer : IEqualityComparer<XElement>
{
public bool Equals(XElement x, XElement y)
{
return x.Attribute("Name").Value == x.Attribute("Name").Value;
}
public int GetHashCode(XElement obj)
{
return obj.Attribute("Name").Value.GetHashCode();
}
}
How to use this one to distinct:
public List<string> LoadDistrict(string region)
{
if (m_DataDoc == null)
return null;
List<string> list = new List<string>();
try
{
var query = from r in m_DataDoc.Elements("DashBoardData").Elements("LevelData").Elements("Region").Where(a => a.Attribute("Name").Value.ToLower() == region.ToLower())
select r;
foreach (var district in query.Elements("District").Distinct(new ItemComparer()))
{
list.Add(district.Attribute("Name").Value);
}
return list;
}
catch (Exception exp)
{
MessageBox.Show(exp.Message);
return null;
}
}
相关文档：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Xml;
using System.IO;
using System.Data;
using System.Dat ......
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="fw_student">
<resultMap class="com.sias.Student" id="student">
<result column="name" property="na ......
IsolatedStorageFile：包含文件和数据的独立存储区
dataset数据存储到本地xml文档，代码处理如下
public static void WriteDataToXML(DataSet dataset, string dataname)
{
try
{
IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForAssembly(); / ......
和Android UI layout一样，我们也可以在XML中定义应用程序的菜单。通过在菜单的onCreateOptionsMenu方法中膨胀菜单layout。这样做会使我们的程序代码简单多了，而且尽可能的将更多的界面设计部分放到XML，便于浏览。
1. 在工程的/res/文件夹下创建menu文件夹，用来保存你为应用程序定义的菜单XML文件。
在菜单XML ......
