How to run different logic from Master page for different tab in TabContainer

Question

In my app, we have master page which has some common features like export to excel, pdf etc.

On content page, I have TabContainer with multiple tabs.

When I run option like export to excel, Master page calls exportExcel function on content page. Based on active tab, I run different logic to export the data. Fields are different on each tab so separate logic is needed.

 var activeTab = TabContainer.ActiveTab;
if (activeTab == abc_Tab)
{
//some logic
}
else if (activeTab == def_Tab)
{
//some logic
}
else if (activeTab == ghi_Tab)
{
//some logic
}
else if (activeTab == jkl_Tab)
{
//some logic
}

This code is working Perfectly fine. The problem is, this if-else logic is repeatative with every master page feature. If I add new feature like export to csv, ExportCsv functiona will also have this if-else condition. This is not limited to export functionality. sometimes, I need to pass some data/parameter also and based on active those, those data/parameter interpret differently.

Is there any better way to handle this?

Answer 1

I would recommend to use Strategy pattern to wrap/hide all this stuff. https://www.dofactory.com/net/strategy-design-pattern

Your can use a dictionary with export logic implementation and use tab name as key to retreive the implementation logic.

Dictionary<string, ExportLogicService> tabExportLogicDictionary= new Dictionary<string, ExportLogicService>();
// constructor
public YourUI()
{
  // Initialize your dictionary
  tabExportLogicDictionary.Add("abc_Tab", new abcTabExportLogic());
  ...
}

Where:

public abstract class ExportLogicService
{
    public abstract void ExportData();
}

public class abcTabExportLogic: ExportLogicService
{
    public override void ExportData()
    {
        // do something...
    }
}

public class ExportService
{
    ExportLogicService exportService;
    // Constructor
    public ExportService(ExportLogicService exportService)
    {
        this.exportService= exportService;
    }
    public void ExportMyData()
    {
        exportService.ExportData();
    }
}

And when it's time to export the data, then do next:

var tabName = TabContainer.TabPages[TabContainer.SelectedIndex].Name.ToString(); //get your tab name
var exportLogic = tabExportLogicDictionary[tabName]; //you can add verification before if needed
exportService = new ExportService(exportLogic);
exportService.ExportMyData();