1. ExpandoObject   扩展对象,运行时动态添加和移除的成员;  要用dynamic 声明,可以在编译时跳过检查,只打包信息, 在运行时在查查找并执行; 有没有javacript Prototype 的感觉?

http://msdn.microsoft.com/zh-cn/library/system.dynamic.expandoobject.aspx

2.DynamicObject 一个基类, 派生类可以override TryGetMember, TrySetMember, TryInvokeMember/TryInvoke 等方法; 

http://msdn.microsoft.com/zh-cn/library/system.dynamic.dynamicobject(v=vs.110).aspx

其中关于TryInvoke可以细细品味 , 如下:

public class DynamicNumber : DynamicObject{    // The inner dictionary to store field names and values.    Dictionary
      
        dictionary        = new Dictionary
       
        ();    // Get the property value.    public override bool TryGetMember(        GetMemberBinder binder, out object result)    {        return dictionary.TryGetValue(binder.Name, out result);    }    // Set the property value.    public override bool TrySetMember(        SetMemberBinder binder, object value)    {        dictionary[binder.Name] = value;        return true;    }    // Initializing properties with arguments' values.    public override bool TryInvoke(        InvokeBinder binder, object[] args, out object result)    {        // The invoke operation in this case takes two arguments.        // The first one is integer and the second one is string.        if ((args.Length == 2) &&            (args[0].GetType() == typeof(int)) &&            (args[1].GetType() == typeof(String)))        {            // If the property already exists,             // its value is changed.            // Otherwise, a new property is created.            if (dictionary.ContainsKey("Numeric"))                dictionary["Numeric"] = args[0];            else                dictionary.Add("Numeric", args[0]);            if (dictionary.ContainsKey("Textual"))                dictionary["Textual"] = args[1];            else                dictionary.Add("Textual", args[1]);            result = true;            return true;        }        else        {            // If the number of arguments is wrong,            // or if arguments are of the wrong type,            // the method returns false.            result = false;            return false;        }    }}class Program{    static void Test(string[] args)    {        // Creating a dynamic object.        dynamic number = new DynamicNumber();        // Adding and initializing properties.        // The TrySetMember method is called.        number.Numeric = 1;        number.Textual = "One";        // Printing out the result.        // The TryGetMember method is called.        Console.WriteLine(number.Numeric + " " + number.Textual);        // Invoking an object.        // The TryInvoke method is called.        number(2, "Two");        Console.WriteLine(number.Numeric + " " + number.Textual);        // The following statement produces a run-time exception        // because in this example the method invocation         // expects two arguments.        // number(0);    }}// This code example produces the following output:// 1 One// 2 Two
       
      

3. CallSite & CallSiteBinder

http://msdn.microsoft.com/zh-cn/library/dd402827.aspx

http://msdn.microsoft.com/zh-cn/library/dd728234(v=VS.95)

5. dynamic 反编译后会是什么?

 static void Main() 

        { 

            dynamic d = 5; 

            d.ToString(); 

            d.ToString(); 

        } 

internal class Program {     // Methods     private static void Main()     {         object d = 5;         if (
      
       o__SiteContainer0.<>p__Site1 == null)         {             
       
        o__SiteContainer0.<>p__Site1 = CallSite
        
         
          >.Create(new CSharpInvokeMemberBinder(CSharpCallFlags.None, "ToString", typeof(Program), null, new CSharpArgumentInfo[] { new CSharpArgumentInfo(CSharpArgumentInfoFlags.None, null) }));         }         
          
           o__SiteContainer0.<>p__Site1.Target(
           
            o__SiteContainer0.<>p__Site1, d); if (
            
             o__SiteContainer0.<>p__Site2 == null) { 
             
              o__SiteContainer0.<>p__Site2 = CallSite
              
               
                >.Create(new CSharpInvokeMemberBinder(CSharpCallFlags.None, "ToString", typeof(Program), null, new CSharpArgumentInfo[] { new CSharpArgumentInfo(CSharpArgumentInfoFlags.None, null) })); } 
                
                 o__SiteContainer0.<>p__Site2.Target(
                 
                  o__SiteContainer0.<>p__Site2, d); } // Nested Types [CompilerGenerated] private static class 
                  
                   o__SiteContainer0 { // Fields public static CallSite
                   
                    
                     > <>p__Site1; public static CallSite
                     
                      
                       > <>p__Site2; } }