DLL Import in c#

Question

I have an application that uses the multiple version of Newtonsoft.dll. By default the version (10.0.0.0) is used. But in the below mentioned function the old version is to be used to handle the below mentioned function. public override TransactionResponse45 Capture(..) {} How to handle this situation?

Željko Perić · Answer

Hello Mukesh Sagar, There is possibility to use external dll files, like different versions of Newtonsoft.dll. by loading them into main application. every time when it is necessary. Here is a peace of code of my program for packing 2d elements at orthogonal table that uses external dll files with its methods for packing elements. Program, on user choice for packing algorithm, loads necessary dll file and uses wanted methods. if (External_Algorithms.Checked == true ) { // // Load .dll file to DLL // var DLL = Assembly.LoadFile(External_Algorithms_File_Paths[External_Algorithms_List.SelectedIndex]); // // Get all Classes from .dll // Type[] Class = DLL.GetTypes(); // // Create Instance as instance of first class in DLL // var Instance = Activator.CreateInstance(Class[0]); // // Get Method "Pack_Elements" by its name from first class in DLL // var Method = Class[0].GetMethod( "Pack_Elements" ); // // Fill Table_List by calling public method Pack_Elements, // instance of first class inside DLL, // that returns data grid view with packed elements data as a result of // packing process. All essential parameters from main application // are passed to Method. // Table_List = (DataGridView) Method.Invoke(Instance, new object [] { table_width * Multiply, table_height * Multiply, saw_blade_thickness, cleaning_left_table_edge * Multiply, cleaning_right_table_edge * Multiply, cleaning_up_table_edge * Multiply, cleaning_down_table_edge * Multiply, horizontal, vertical, Element_List_Copy, sort_by }); // // This option enables to user to write its own My_Class.cs // for packing rectangular elements at orthogonal table. // // Developed program must be published as dll // // External algorithm dll's must follow defined rules // // Read program manual How to create External Algorithm // } What is important, to be able to use above solution for loading dll files and using classes, and methods that dll file contains, there is need to know structure of dll, names of classes,methods... All the best, Željko Peric