Building the User Interface Layer in VS .NET

Generation Quick Response Code in VS .NET Building the User Interface Layer
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Building the User Interface Layer
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When building production-level applications, you may want to consider enhancing the basic user interface layer as follows:
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Status messages A status bar at the bottom of the MDI parent form displays status messages You can add code in the forms to display appropriate messages to the user, such as update complete Enabling/disabling panels When the user first opens a form, if you want the user to select an entry from the list and not type anything else into the form, you can disable the information panel at the bottom of the form After the user selects an entry, you can enable the information panel to allow edits Alternatively, you could leave the information panel enabled If the user types information into the panel, assume you need to create a new entry Handling changes to values in the combo box If the user changes data that is displayed in the combo box, modify the combo box contents accordingly For example, if the user updates the product name, the product name drop-down should recognize the change To implement this, add code to the ProcessSave method in the form to repopulate the combo box list if the field displayed in the combo box (the product name in this example) is changed Handling a delete First, it is a good idea to request confirmation of a delete That way, the user won t inadvertently delete something If the delete is confirmed, clear the data from the user interface and remove the item from the combo box To implement this, add code in the ProcessDelete method to display a message box for confirmation After the delete (which would be handled in the business object), clear the form contents and repopulate the combo box list Handling an insert When the user performs an insert, clear any existing data in the user interface to allow entry of the new data After the data is saved, add the item to the list in the combo box To implement this, add code in the ProcessNew method to clear the form contents Then add code to the ProcessSave method to repopulate the combo box list when the user saves a new entry
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Enabling/disabling features based on role You may have features in the application that are not available to all the users of the application For example, you may have some administrative features for modifying the standard set of type codes for product types, customer types, and so on One way to limit these features to people with administrative rights is to write a separate application for these features and provide that application to the administrators A more common technique is to add the features to the primary application and then enable and disable the features based on the user s role The user interface (the MDI form in the Purchase Tracker example) would then determine which menu options were enabled for the user by writing code similar to the following:
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Private Sub PurchaseMenu_DropDownOpening(ByVal sender _ As Object, ByVal e As SystemEventArgs) _ Handles PurchaseMenuDropDownOpening If MyUserIsInRole(_ ApplicationServicesBuiltInRoleAdministrator) Then ManageTypesMenuItemEnabled = True Else ManageTypesMenuItemEnabled = False End If End Sub
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4 BUILDING THE USER INTERFACE LAYER
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Instead of hard-coding the roles in the UI, you could consider building a Security class in the business logic layer that would identify which roles could access which features This Security class could optionally access a database to retrieve this information The UI would then call the Security class to determine the roles that can access a feature and then use the IsInRole method to determine if the current user has one of the defined roles Enabling/disabling controls based on role Some applications limit which users can update values in the user interface So you may need to display some values as read-only based on the user s role You can use the techniques described in the preceding bullet point to enable/disable controls based on the user s role
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