C # dynamically loads DLL files and implements methods that call them (recommended) analysis

The following small series for everyone to bring a C # dynamic load DLL file, and implement the method called (recommended). Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it with a little knitting.

Here is the test code:

Create a new classlibrary, containing two classes Class1 and Class2, each of the two classes has a method that returns a string with the following code:

Using system;using system.collections.generic;using system.linq;using system.text;namespace mydll{Public  class Class1  {public    Class1 ()    {    } public    string SayHello ()    {      return ' hello,word! ';    }  } Public  class Class2  {public    Class2 ()    {    } public    string saybeautiful ()    {      return "Beautiful,very good!";    }  }}

A mydll.dll dynamic-link library is generated after compilation, and a new WinForm project is created (and, optionally, debug):

private void Button1_Click (object sender, EventArgs e) {string path = @ "D:\123\mydll\mydll\bin\Debug\mydll.dll";      byte[] byte1 = System.IO.File.ReadAllBytes (path),//is also possible//assembly Assem = Assembly.Load (byte1);      Assembly Assem = assembly.loadfile (path); String t_class = "Mydll. Class1 ";//theoretically loaded DLL file, you can get the class type by namespace plus class name, here should be modified as follows://string t_class =" Mydll. Class1,mydll ";//If what you want to get is the class inside the project, you can" namespace. Parent class ...      The class name "; if it is external, it needs to be appended with the", link library name ";      Thanks again for Thy38 's help. Type ty = Type.GetType (t_class);//Here in the debugging time Ty=null, always do not understand, looking for an expert can doubt type[] Tys = Assem. GetTypes ();//had to get all the type names and then traverse through the type name to differentiate the foreach (type ty in Tys)//huoquleiming {if (Ty). Name = = "Class1") {constructorinfo magicconstructor = ty. GetConstructor (type.emptytypes);//Gets the constructor without parameters object Magicclassobject = Magicconstructor.invoke (new object[] {})         ;//Here is an east//object magicclassobject = activator.createinstance (t) to get a class-like instance, or a constructed instance with no arguments can be MethodInfo mi = ty.          GetMethod ("SayHello"); Object Aa=mi.          Invoke (magicclassobject, NULL); MessageBox.Show (AA. ToString ());//Here is the SayHello method for executing class Class1} if (Ty. Name = = "Class2") {constructorinfo magicconstructor = ty.          GetConstructor (type.emptytypes);           Get a constructor without parameters, if there is a constructor and there is no constructor without parameters, this is not the case here. Object Magicclassobject = Magicconstructor.invoke (new object[] {}); MethodInfo mi = ty.          GetMethod ("saybeautiful"); Object AA = mi. Invoke (magicclassobject, NULL);//If the method has parameters, it needs to replace NULL with the set MessageBox.Show (AA) of the parameter.        ToString ()); }}//appdomain Plugindomain = (Plugininstancecontainer[key] as pluginentity).      Plugindomain;      if (plugindomain! = null)//{//AppDomain.Unload (Plugindomain); // }     }

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