深入理解C# 3.0的新特性

ChinaItLab

artech

2007-7-16

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在Utility中定义了两个GetEmployee方法，分别返回以Anonymous Type形式和Named Type形式的Employee对象。

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using Artech.NewFeatureInCSharp.Library;

  namespace Artech.NewFeatureInCSharp.ConsoleApp
  {
   class Program
   {
   static void Main(string[] args)
   {
   var v1 = new{ID = Guid.NewGuid(), Name= "Zhang San" };
   var v2 = new { ID = Guid.NewGuid(), Name = "Li Si"};
   var v3 = Utility.Anonymous_GetEmployee(Guid.NewGuid(), "Wang Wu");
   Console.WriteLine("var v1 = new{ID = Guid.NewGuid(), Name= \"Zhang San\" };");
   Console.WriteLine("var v2 = new{ID = Guid.NewGuid(), Name= \"Li Si\" };");
   Console.WriteLine("var v3 = Utility.Anonymous_GetEmployee(Guid.NewGuid(), \"Wang Wu\");");

   Console.WriteLine("\nv1.GetType() = {0}", v1.GetType());
   Console.WriteLine("v2.GetType() = {0}", v2.GetType());
   Console.WriteLine("v3.GetType() = {0}", v3.GetType());

   Console.WriteLine("\nobject.ReferenceEquals(v1.GetType(),v2.GetType()) = {0}",object.ReferenceEquals(v1.GetType(),v2.GetType()));
   Console.WriteLine("object.ReferenceEquals(v1.GetType(),v3.GetType()) = {0}", object.ReferenceEquals(v1.GetType(), v3.GetType()));

   Console.WriteLine("\n\n");

   var v4 = new Employee { ID = Guid.NewGuid(), Name = "Zhang San" };
   var v5 = new Employee { ID = Guid.NewGuid(), Name = "Li Si" };
   var v6 = Utility.GetEmployee(Guid.NewGuid(), "Wang Wu");
   Console.WriteLine("var v4 = new Employee{ID = Guid.NewGuid(), Name= \"Zhang San\" };");
   Console.WriteLine("var v5 = new Employee{ID = Guid.NewGuid(), Name= \"Li Si\" };");
   Console.WriteLine("var v6 = Utility.GetEmployee(Guid.NewGuid(), \"Wang Wu\");");

   Console.WriteLine("\nv4.GetType() = {0}", v4.GetType());
   Console.WriteLine("v5.GetType() = {0}", v5.GetType());
   Console.WriteLine("v6.GetType() = {0}", v6.GetType());

   Console.WriteLine("\nobject.ReferenceEquals(v4.GetType(),v5.GetType()) = {0}", object.ReferenceEquals(v4.GetType(), v5.GetType()));
   Console.WriteLine("object.ReferenceEquals(v4.GetType(),v6.GetType()) = {0}", object.ReferenceEquals(v4.GetType(), v6.GetType()));
   }
   }
  }

代码不复杂，我在这里简单介绍一下整体的结构。这个结构分两部分，第一部分是基于Anonymous Type的，另一部分是基于Named Employee Type的。在第一部分中，我首先创建了3个Anonymous Type的Instance：v1、v2和v3（v3是通过调用定义在Artech.NewFeatureInCSharp.Library中的Utility获得，其余两个则直接通过Inline的方式创建），第二部分也具有相同的代码结构。

  var v1 = new{ID = Guid.NewGuid(), Name= "Zhang San" };
  var v2 = new { ID = Guid.NewGuid(), Name = "Li Si"};
  var v3 = Utility.Anonymous_GetEmployee(Guid.NewGuid(), "Wang Wu");

然后现实他们对应的Type的Full name.

  Console.WriteLine("\nv1.GetType() = {0}", v1.GetType());
  Console.WriteLine("v2.GetType() = {0}", v2.GetType());
  Console.WriteLine("v3.GetType() = {0}", v3.GetType());

     最后调用object.ReferenceEquals对这3个Type进行比较。

  Console.WriteLine("\nobject.ReferenceEquals(v1.GetType(),v2.GetType()) = {0}",object.ReferenceEquals(v1.GetType(),v2.GetType()));
  Console.WriteLine("object.ReferenceEquals(v1.GetType(),v3.GetType()) = {0}", object.ReferenceEquals(v1.GetType(), v3.GetType()));

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