Common Expression Methods

Using System;
 Using System. Collections. Generic;
 Using System. LINQ;
 Using System. text;
 Using System. LINQ. expressions;
 Using System. collections;
 Using System. Data. Common;
 Using System. Data;
 Using System. Data. LINQ;
Using System. reflection;
 Using System. diagnostics;

 Namespace Consoleapp
{

 Public   Class Boy
{
 Public   Int Userid;
 Public   Int Age;
 Public   String Name;
 Public   Static   String Move ()
{
 Return   String . Format ( "  The boy begin move;  " );
}

 Public   Static   Int Getdoubblenum ( Int Num)
{
 Return Num + num;
}
 Public Boy (){}


 Public   String Play ( String Objname)
{
 Return   "  Play  " + Objname;
}
}



 Class Program
{
 Static   Void Main ( String [] ARGs)
{
Parameterexpression boyparameter = expression. parameter ( Typeof (Boy ), "  Boy  " );
Parameterexpression intparameter = expression. parameter ( Typeof (Int32 ), " I  " );
Parameterexpression strparameter = expression. parameter ( Typeof ( String ), "  Str  " );
 //  Call a static method without Parameters  
 Methodinfo minfo = Typeof (Boy). getmethod ( "  Move " );
Methodcallexpression mcexp = expression. Call ( Null , //  The static method is null.  
 Minfo,
 New Expression [] {} //  Type of the parameter passed in by the static method: typeof (object)  
 );
 VaR Staticmethodnoprameter = expression. Lambda <func <boy, String >>( Mcexp, boyparameter). Compile ();


 //  Call a static method with Parameters  
 Minfo = Typeof (Boy). getmethod ( "  Getdoubblenum  " );
Mcexp = expression. Call ( Null ,
Minfo,
 New Expression [] {intparameter });
 VaR Staticmethodhaveprameter = expression. Lambda <func <boy, Int , Int >>( Mcexp, boyparameter, intparameter). Compile ();


 //  Call common methods  
 Minfo = Typeof (Boy). getmethod ( "  Play  " );
Mcexp = expression. Call (boyparameter,
Minfo,
 New Expression [] {strparameter });
 VaR Generalmethod = expression. Lambda <func <boy, String , String >>( Mcexp, boyparameter, strparameter). Compile ();


Boy boy = New Boy () {userid = 10 , Age = 18 , Name = "  Rhythmk  " };

Console. writeline ("  Staticmethodnoprameter:  " + Staticmethodnoprameter (boy ));
Console. writeline ( "  Staticmethodhaveprameter:  " + Staticmethodhaveprameter (boy, 12 ));
Console. writeline ( "  Generalmethod:  " + Generalmethod (boy, "  Footboy " ));

 /*  Output result:
* Staticmethodnoprameter: The boy begin move;
* Staticmethodhaveprameter: 24
* Generalmethod: Play the footboy
  */ 

Console. Read ();
}



}

}