[转载]利用Linq写简洁代码

<?xml version="1.0" encoding="utf-8" ?>
<Earthworm>
  <Demo>
    <Aspect name="">
      <Advice type="before" assembly="" className="">
        <MethodName>asd</MethodName>
        <MethodName>kll</MethodName>
      </Advice>
      <Advice type="stop" assembly="" className="">
        <MethodName></MethodName>
        <MethodName></MethodName>
      </Advice>
      <Advice type="after" assembly="" className="">
        <MethodName></MethodName>
        <MethodName></MethodName>
      </Advice>
    </Aspect>
  </Demo>
</Earthworm>

XmlDocument xmldoc = new XmlDocument();
 xmldoc.Load(@"d:\demo.xml");
 XmlNodeList nodelist = xmldoc.SelectNodes("Earthworm/Demo/Aspect/Advice[@type='before']/MethodName");
 foreach (XmlNode node in nodelist)
 {
 Console.WriteLine(node.InnerText); 
}

var dname = from k in  (from m in XDocument.Load("d:\\zhongming.xml").Descendants("Advice") 
             where m.Attribute("type").Value == "before"  select m).Descendants("MethodName") select k.Value;//一句话搞定，很给力
            foreach (var a in dname)
            {
                Console.WriteLine(a);
            }

var findObjects = new List<int>();
            foreach (int i in data)
            {
                if (i > 50)
                {
                    findObjects.Add(i);
                }
            }

 var findObjects=from d in data where d>50 select d;//同样是一句话

     class People
        {
            /// <summary>
            /// 姓名
            /// </summary>
            public string Name{get;set;}
            /// <summary>
            /// 年龄
            /// </summary>
            public int Age{get;set;}
            /// <summary>
            /// 性别
            /// </summary>
            public bool Gender { get; set; }
        }

People[] data = new People[] { new People{Name="西门吹雪",Gender=true,Age=1200},
                                                               new People{Name="令狐冲",Gender=true,Age=999},
                                                               new People{Name="任盈盈",Gender=false,Age=456},
                                                               new People{Name="欧阳锋",Gender=true,Age=9999},
                                                               new People{Name="黄药师",Gender=true,Age=670},
                                                               new People{Name="吴世龙",Gender=true,Age=25}};

struct DynamicObject
        {
            public string Name;
            public int   Age;
        }

List<DynamicObject> objs = new List<DynamicObject>();
            foreach (People p in data)
            {
                objs.Add(new DynamicObject { Name = p.Name, Age = p.Age });
            }

var objects = from d in data select new { d.Name, d.Age };

var doc = XDocument.Load(@"d:\demo.xml");
            var list=from m in doc.Descendants("Advice") where m.Attribute("type").Value == "before"  select m;
            var datas=from k in  list.Descendants("MethodName") select k.Value;
            foreach (var a in datas)
            {
                Console.WriteLine(a);
            }

  IEnumerable<string> datas = from k in (from m in XDocument.Load(@"d:\demo.xml").Descendants("Advice")
            where m.Attribute("type").Value == "before"
            select m).Descendants<XElement>("MethodName") select k.Value;//变成一句了哦
        foreach (string a in datas)
        {
            Console.WriteLine(a);
        }