// Open closed principle
// Our class is opened to extension but closed to modification
// By adding the PersonFormat delegate we created the extension point
// We changed how the class behaves without changing the class itself
public string ToString(PersonFormat format)
{
if (format != null)
{
return(format(this));
}
return(this.ToString());
}
public string ToString(PersonFormat format)
{
if (format != null)
{
return(format(this));
}
else
{
return(string.Empty);
}
}
/// <summary>
/// Gets from the parent if the parent is the PersonListingControl
/// </summary>
private void CaptureSettings()
{
PersonListingControl parent = Parent as PersonListingControl;
if (parent != null)
{
personFormat = parent.PersonFormat;
firstNameField = parent.DataFirstNameField;
lastNameField = parent.DataLastNameField;
birthDateField = parent.DataBirthDateField;
birthDateFormat = parent.DataBirthDateFormat;
cityField = parent.DataCityField;
countryField = parent.DataCountryField;
}
}
// In order to assign a value to formatPerson viariable we check the values of radio buttons inside the UI
// Then we assign an appropriate method
private void AssignDelegate()
{
if (Option1Button.IsChecked.Value)
{
formatPerson = Formatters.Default;
}
else if (Option2Button.IsChecked.Value)
{
formatPerson = Formatters.LastNameToUpper;
}
else if (Option3Button.IsChecked.Value)
{
formatPerson = Formatters.FirstNameToLower;
}
else if (Option4Button.IsChecked.Value)
{
formatPerson = Formatters.FullName;
}
}
private void AssignToDelegate()
{
if (rbOptionOne.Checked)
{
proc = Formatters.Default;
}
else if (rbOptionTwo.Checked)
{
proc = Formatters.LastNameToUpper;
}
else if (rbOptionThree.Checked)
{
proc = Formatters.FirstNameToLower;
}
else if (rbOptionFour.Checked)
{
proc = Formatters.FullNameToUpper;
}
else
{
proc = Formatters.Default;
}
}
/*
* here , a delegate is sent as a parameter to
* this function
*/
public string ToString(PersonFormat format)
{
return(format(this));
}
