/// <summary>
/// Raises the Changing event. </summary>
/// <param name="e">
/// The arguments object associated with the Changing event. </param>
/// <remarks>
/// This method should be invoked prior to making a change to the profile so that the
/// Changing event is raised, giving a chance to the handlers to prevent the change from
/// happening (by setting e.Cancel to true). This method calls each individual handler
/// associated with the Changing event and checks the resulting e.Cancel flag.
/// If it's true, it stops and does not call of any remaining handlers since the change
/// needs to be prevented anyway. </remarks>
/// <seealso cref="Changing" />
/// <seealso cref="OnChanged" />
protected virtual void OnChanging(ProfileChangingArgs e)
{
if (Changing == null)
{
return;
}
foreach (ProfileChangingHandler handler in Changing.GetInvocationList())
{
handler(this, e);
// If a particular handler cancels the event, stop
if (e.Cancel)
{
break;
}
}
}
/// <summary>
/// Raises either the Changing or Changed event. </summary>
/// <param name="changing">
/// If true, the Changing event is raised otherwise it's Changed. </param>
/// <param name="changeType">
/// The type of change being made. </param>
/// <param name="section">
/// The name of the section that was involved in the change or null if not applicable. </param>
/// <param name="entry">
/// The name of the entry that was involved in the change or null if not applicable.
/// If changeType is equal to Other, entry is the name of the property involved in the change.</param>
/// <param name="value">
/// The value that was changed or null if not applicable. </param>
/// <returns>
/// The return value is based on the event raised. If the Changing event was raised,
/// the return value is the opposite of ProfileChangingArgs.Cancel; otherwise it's true.</returns>
/// <remarks>
/// This method may be used by derived classes as a convenient alternative to calling
/// OnChanging and OnChanged. For example, a typical call to OnChanging would require
/// four lines of code, which this method reduces to two. </remarks>
/// <seealso cref="Changing" />
/// <seealso cref="Changed" />
/// <seealso cref="OnChanging" />
/// <seealso cref="OnChanged" />
protected bool RaiseChangeEvent(bool changing, ProfileChangeType changeType, string section, string entry, object value)
{
if (changing)
{
// Don't even bother if there are no handlers.
if (Changing == null)
{
return(true);
}
ProfileChangingArgs e = new ProfileChangingArgs(changeType, section, entry, value);
OnChanging(e);
return(!e.Cancel);
}
// Don't even bother if there are no handlers.
if (Changed != null)
{
OnChanged(new ProfileChangedArgs(changeType, section, entry, value));
}
return(true);
}