public ExpenseLoggerFormBase()
{
// ExpenseLoggerQueries using for getting data.
this.appQueries = new ExpenseLoggerQueries();
// ExpenseLoggerCommands: using for creating, updating and deleting data.
this.appCommands = new ExpenseLoggerCommands();
// Build-in error provider which will be used for data validation.
errorProvider = new ErrorProvider();
// This event is fired when form is loaded.
this.Load += ExpenseLoggerFormBase_Load;
}
/// <summary>
/// This method aims to load and get some services available in ExpenseLoggerAppForm
/// So the child forms can use the same services with its parents forms.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BaseUserControl_Load(object sender, EventArgs e)
{
// Access to parent form and store it to a variable which will be shared cross derived class
ExpenseLoggerAppForm parentForm = this.Parent?.Parent as ExpenseLoggerAppForm;
if (parentForm != null)
{
appQueries = parentForm.appQueries;
appCommands = parentForm.appCommands;
}
else
{
appQueries = new ExpenseLoggerQueries();
appCommands = new ExpenseLoggerCommands();
}
this.LoadFormData();
}
