VS2008新特性

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VS2008新特性

• 简单介绍及体会：

1. 把Ajax extension集成到了Visual studio2008中；

2. JS 智能感知；

如在编辑页面加入如下语句，则编辑器就支持JQuery智能提示    <script src="JqueryIntellisense/jquery-1.2.6.js" type="text/javascript"></script>    <%if(false) { %><script src="JqueryIntellisense/jquery-1.2.6-vsdoc.js" type="text/javascript"></script>  <%} %>

 

3. LINQ（Language Integrated Query）；

体会：在操作Objects，Sql，Xml，Entities，DateSets时，使用Linq是非常方便的；部分代码如下：

string[] array = {"wis","dd","aa","ad" }; IEnumerable<string> res = from s in array where s.StartsWith("a") orderby s select s; foreach(string r in res) {    Console.WriteLine(r); }

 

4. Var 隐式类型；

注：隐式本地变量的声明必须同时包含一个初始化器。

5. 自动的属性，可以在编译的时候，生成private data field；
6. 扩展方法：可以为编译好的程序集动态的添加方法；

      体会：必须是static类+static方法；只有且有第一个参数必须用this。

以下是一个Json对象转换的类： namespace LSHI.JsonHelper {     public static class OperatorJson     {         public static string ToJSON(this object obj)         {             DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());             using (MemoryStream ms = new MemoryStream())             {                 serializer.WriteObject(ms, obj);                 return Encoding.Default.GetString(ms.ToArray());             }         }          public static T ParseJSON<T>(this string str)         {             T obj = Activator.CreateInstance<T>();             using (MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(str)))             {                 DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());                 return (T)serializer.ReadObject(ms);             }         }     } } 使用如下： IList<User> listUser = new List<User>             {                 new User{UserID="1001",UserName="shilin1",UserAge=10},                 new User{UserID="1002",UserName="shilin2",UserAge=20},                 new User{UserID="1003",UserName="shilin3",UserAge=30}             };             string str = listUser.ToJSON();             IList<User> obj = str.ParseJSON<List<User>>();

 

7. 扩展接口；

项目中有些对象经常需要重置部分或全部属性到初始状态，想给这些类全部都加上个Reset()方法，又显得太冗余，如果利用扩展接口就显得很容易。代码如下： 先定义一个接口： public interface IResetable { } 扩展这个接口： public static class ResetableImpl     {         public static void Reset(this IResetable obj)         {             var ctor = obj.GetType().GetConstructor(BindingFlags.Instance | BindingFlags.Public,                 null, new Type[0], null);              ctor.Invoke(obj, null);         }   } 定义一个使用该接口的类： class Mail : IResetable     {  public string Subject { get; set; }         public string Body { get; set; }         public MailAddress From { get; set; }         public MailAddress To { get; set; }         public Mail()         {   this.Subject = "";             this.Body = "";             this.From = null;             this.To = null;         }   }   具体使用就很简单： public class Program     {  static void Main(string[] args)         {             Mail mail = new Mail();             mail.From = new MailAddress("[e-mail]");             mail.To = new MailAddress("[e-mail]");             mail.Subject = "hi friend";             mail.Body = "mail content.";             Console.WriteLine("1/nFrom={0},To={1},/nSubject={2},Body={3}",              mail.From, mail.To, mail.Subject, mail.Body);             mail.Reset();             Console.WriteLine("2/nFrom={0},To={1},/nSubject={2},Body={3}",              mail.From, mail.To, mail.Subject, mail.Body);             Console.ReadKey();         }     }

8. 局部方法 局部类型；
9. 初始化；

IList<User> listUser = new List<User>             {                 new User{UserID="1001",UserName="shilin1",UserAge=10},                 new User{UserID="1002",UserName="shilin2",UserAge=20},                 new User{UserID="1003",UserName="shilin3",UserAge=30}             };

 

10. 匿名类型；

var q = DataSession.Objects.Where                 (c => c.ReceiverName == receiverName && c.ProcessType == 0 && c.Deleted == 0                     && c.Archived == 0 && c.IsDraft == 0 && c.ReceiverArchived == 0).OrderByDescending(c => c.ReceiveDate);

11. Lambda表达式；

public IList<SpecialInformationEntity> SelectInformationView(string receiverName)         {             var q = DataSession.Objects.Where                 (c => c.ReceiverName == receiverName && c.ProcessType == 0 && c.Deleted == 0                     && c.Archived == 0 && c.IsDraft == 0 && c.ReceiverArchived == 0).OrderByDescending(c => c.ReceiveDate);             IList<SpecialInformationEntity> list = q.Take(topCount).ToList();             if (0 < list.Count)                 return list;             return null;         }

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