Dynamically Create instance for class

Question

Hi i have 2 class (YarnBLL, DyingBLL) with same property. i need to create a instace based on switch case public String insave(String name) { var obj; switch (name) { case "YARN" : obj = new YarnBLL(); break ; case "WEAVING" : obj = new DyingBLL(); break ; default : break ; } obj.InDate = Utils.ConvertStringToDate(txtDate.Text); obj.CategoryName = ddlCategory.SelectedItem.ToString(); obj.Save(); } Here i have an error in var obj; it shows Error 1 Implicitly-typed local variables must be initialized

Jaish Mathews · Answer

You should refer Factory design pattern here.

Mario Scheeren · Answer

Hi, make them both inherit from an interface consoting of those properties / methods. public interface IBaseInterface { DateTime InDate { get ; set ; } string CategoryName { get ; set ; } void Save(); } public class YarnBLL : IBaseInterface { public DateTime InDate { get ; set ; } public string CategoryName { get ; set ; } public void Save() { } } public class DyingBLL : IBaseInterface { public DateTime InDate { get ; set ; } public string CategoryName { get ; set ; } public void Save() { } } public string insave( string name) { IBaseInterface obj; switch (name) { case "YARN" : obj = new YarnBLL(); break ; case "WEAVING" : obj = new DyingBLL(); break ; default : break ; } obj.InDate = Utils.ConvertStringToDate(txtDate.Text); obj.CategoryName = ddlCategory.SelectedItem.ToString(); obj.Save(); } You should try learn / understand OOP !

Mageshwaran R · Answer

Hi, Please refer the below link, it might helps you https://stackoverflow.com/questions/34701795/dynamically-create-instances-of-c-sharp-class/34701819