C # reflect the dynamic call of methods in DLL and return results

I recently looked at the factory development model and found that reflection was used. I only heard of and never used it. So I spent some time reviewing it again;

The function of reflection is to dynamically load a DLL (ProgramSet), execute a method in the Assembly, and return the result. Of course, you can also pass parameters to the method.

 

 Namespace  Assembly_name {  Public   Class  Assembly_class {  Public   String Show_str ( String  Str ){  If ( String . Isnullorempty (STR ))  Return   "  You have not passed in the Parameter  "  ;  Else                    Return   "  There are parameters. The parameters are:  " + STR ;}}} 

Write a test class above. The namespace is assembly_name and the class name is assembly_class. The show_str parameter in the class name is of the string type and the return value is of the string type;

This class was generated in my workshop. The generated DLL is app_code.dll (this can be based on your situation, not entirely app_code.dll ), add the DLL to your project (important );

 

 

 //  Load the Assembly (DLL file address) and use the Assembly class Assembly = assembly. LoadFile (appdomain. currentdomain. basedirectory + "  Bin/app_code.dll  "  );  //  Get type, parameter (namespace + class) Type type = assembly. GetType ( "  Assembly_name.assembly_class  "  );  // Instance for creating this object, object type, parameter (namespace + class)  Object Instance = assembly. createinstance ( "  Assembly_name.assembly_class  "  );  //  Set the parameter type in the show_str method. Type [] type. If multiple parameters exist, you can append multiple parameters. Type [] params_type = New Type [ 1  ]; Params_type [  0 ] = Type. GetType ( " System. String  "  );  //  Set the parameter values in the show_str method. If multiple parameters exist, you can append multiple parameters. Object [] params_obj = New Object [ 1  ]; Params_obj [  0 ] = "  Jiaopeng  "  ;  //  Execute the show_str Method Object Value = type. getmethod ( "  Show_str  " , Params_type). Invoke (instance, params_obj );