c# - How to call Action<string, bool> from il generator -

in example code trying invoke anonymous action il generator. not sure if , how can load reference delegate , how call it. can if onfunctioncall static method not property.

public delegate void testdelegate();  public static class exampleone {     public static action<string, bool> onfunctioncall         => (message, flag) => console.writeline("example"); }  public static class exampletwo {     public static ttype createdelegate<ttype>(action<string, bool> onfunctioncall)         ttype : class     {         var method = new dynamicmethod($"{guid.newguid()}", typeof(void), type.emptytypes, typeof(ttype), true);          ilgenerator il = method.getilgenerator();          // emit code invoke unmanaged function ...          // loading first string argument         il.emit(opcodes.ldstr, method.name);          // not sure here how load boolean value stack         il.emit(opcodes.ldc_i4_0);          // line doesn't work         // example 2 has no idea exampleone         // possible load reference of action<string, bool> stack , call ?         il.emit(opcodes.call, onfunctioncall.method);          il.emit(opcodes.ret);          return method.createdelegate(typeof(testdelegate)) ttype;     } }  public class program {     public static void main(string[] args)         => exampletwo             .createdelegate<testdelegate>(exampleone.onfunctioncall)             .invoke(); } 

you have pass information delegate want invoke stored. convenience way accept memberexpression, otherwise accepting memberinfowould work too. have @ modified code:

public delegate void testdelegate();  public static class exampleone {     public static action<string, bool> onfunctioncall         => (message, flag) => console.writeline("onfunctioncall");      public static action<string, bool> onfunctioncallfield          = (message, flag) => console.writeline("onfunctioncallfield"); }  public static class exampletwo {     public static ttype createdelegate<ttype>(expression<func<object>> expression)         ttype : class     {         var body = expression.body memberexpression;         if (body == null)         {             throw new argumentexception(nameof(expression));         }          var method = new dynamicmethod($"{guid.newguid()}", typeof(void), type.emptytypes, typeof(ttype), true);          ilgenerator il = method.getilgenerator();          // typed invoke method ,         // call getter or load field         methodinfo invoke;         if (body.member propertyinfo pi)         {             invoke = pi.propertytype.getmethod("invoke");             il.emit(opcodes.call, pi.getgetmethod());         }         else if (body.member fieldinfo fi)         {             invoke = fi.fieldtype.getmethod("invoke");             il.emit(opcodes.ldsfld, fi);         }         else         {             throw new argumentexception(nameof(expression));         }          il.emit(opcodes.ldstr, method.name);         il.emit(opcodes.ldc_i4_0);         il.emit(opcodes.callvirt, invoke);         il.emit(opcodes.ret);          return method.createdelegate(typeof(testdelegate)) ttype;     } }  public class program {     public static void main(string[] args)     {         exampletwo             .createdelegate<testdelegate>(() => exampleone.onfunctioncall)             .invoke();          exampletwo             .createdelegate<testdelegate>(() => exampleone.onfunctioncallfield)             .invoke();          console.readline();     } } 

the code running on .net core 2.0.