Assembly loading and Reflection (ii): actual combat

Directory:

• Previous article: http://www.cnblogs.com/sunchong/p/4550476.html
• Demo

First, the Demo

The following demo uses a strategy model to mimic the plugin mechanism. Let's give an example of sending an email:

1, a Policy class library: strategy, which defines the interface that the message needs to implement: Iemailstrategy.

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespacestrategy{ Public InterfaceIemailstrategy {stringfrom {Get; } stringto {Get; }        stringSubject {Get; } BOOLSend (string  from,stringTo,stringsubject); }}

2, a specific implementation of the class library: target, the specific mailbox delivery policy implementation: Tow_email.

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingstrategy;namespacetarget_1{ Public classEmail:iemailstrategy { Public stringTestfield_1 =string.        Empty;  Public intTestfield_2 =0;  PublicEmail (string  from,stringTo,stringsubject) {_from= from; _to=to ; _subject=subject; }        Private ReadOnly string_from; Private ReadOnly string_to; Private ReadOnly string_subject;  Public stringFrom {Get{return_from;} }         Public stringTo {Get{return_to;} }         Public stringSubject {Get{return_subject;} }         Public BOOLSend (string  from,stringTo,stringsubject) {Console.WriteLine ("Send Email successed!"); return true; }    }}

3, finally my host program, Reflectiontest, the specific mailbox policy implementation Target_1.dll (can be regarded as a third-party code) DLL copy to, the host program related directory.

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespacereflectiontest{classProgram {Static voidMain (string[] args) {            //gets the path of the current main program            stringHostfilepath =System.IO.Path.GetDirectoryName (System.Reflection.Assembly.GetEntryAssembly ().            Location); //Get DLL Path            string[] dlls = System.IO.Directory.GetFiles (Hostfilepath,"*.dll"); foreach(stringDllinchDLLs) {                //Load DLLSystem.Reflection.Assembly Assembly =System.Reflection.Assembly.LoadFrom (DLL); if(Assembly! =NULL&& Assembly. GetName (). Name = ="target_1") {Console.WriteLine ("Assembly name:{0}", assembly.                    FullName); //get all public classes in an assemblytype[] Types =Assembly.                    Getexportedtypes (); foreach(Type tinchtypes) {Console.WriteLine ("Type name: {0}", T.fullname); if(T.isclass &&typeof(Strategy.iemailstrategy). IsAssignableFrom (t)) {//gets the public member of the current classSystem.reflection.memberinfo[] Members =t.getmembers (); string  from="[email protected]"; stringto ="[email protected]"; stringSubject ="Come on Baby"; Console.WriteLine ("----instantiation----"); Strategy.iemailstrategy Email= (strategy.iemailstrategy) System.Activator.CreateInstance (T, from, to, subject); if(Email! =NULL)                            {                                string_f=email.                                from; string_t=email.                                to; string_s=email.                                Subject; Email.                                                           Send (_f,_t,_s); }                                                                                                                 //FieldConsole.WriteLine ("----Field----"); System.reflection.fieldinfo[] Fields=T.getfields (); foreach(varFinchFields ) {Console.WriteLine ("Field name: {0}", F.name); Console.WriteLine ("Field type: {0}", f.fieldtype.tostring ()); Console.WriteLine ("Field value: {0}", F.getvalue (email).                                                                                            ToString ()); }                                                        //PropertiesConsole.WriteLine ("----Property----"); System.reflection.propertyinfo[] Ppinfo=t.getproperties (); foreach(varPinchppinfo) {Console.WriteLine ("PropertyInfo name: {0}", p.name); Console.WriteLine ("PropertyInfo can read: {0}", p.canread.tostring ()); Console.WriteLine ("PropertyInfo can write: {0}", p.canwrite.tostring ()); Console.WriteLine ("PropertyInfo value: {0}", P.getvalue (email)); }                            //MethodConsole.WriteLine ("----Method----"); System.reflection.methodinfo[] Methodsinfo=T.getmethods (); foreach(varMtinchmethodsinfo) {Console.WriteLine ("MemberInfo name: {0}", Mt.                                Name); Object[] objs=New Object[]{"[email protected]","[email protected]","Come on baby!"}; if(Mt. name=="Send") Mt.                                Invoke (EMAIL,OBJS); //All-in-all method: Here's how it's doneT.invokemember ("Send", System.Reflection.BindingFlags.InvokeMethod,NULL, email, OBJS);                        } console.readkey (); }                    }                }            }        }    }}

Summarize:

1. Conventional reflection

Load assembly---> Filter class getexportedtypes ()---> Instantiate (System.Activator.CreateInstance)---> Get class Public member GetMembers ()--- ; Type class: GetFields (), GetProperties (), GetMethods ()

2, All-round reflection: InvokeMember ("Send", System.Reflection.BindingFlags.InvokeMethod, NULL, email, OBJS);

Assembly loading and Reflection (ii): actual combat