Zapmiętywanie ustawień strony dla drukowania

Poniższy fragment kodu umożliwia nam zapamiętywanie i przywracanie ustawień drukowanej strony (System.Drawing.Printing.PageSettings). Zapamiętywane są wszystkie ustawienia które możemy ustawić: rodzaj papieru, źródło papieru, marginesy, orientacja strony. Ustawienia są pamiętane w pliku konfiguracyjnym aplikacji. Prawdopodobnie dla systemów gdzie jednostką miary jest cal, poniższy kod nie będzie dobrze liczył marginesów. Przykład zastosowania:

PageSettings.Instance.Save(pageSetupDialog.PageSettings);
PageSettings.Instance.Restore(pageSetupDialog.PageSettings);

Kod:

public class Config
{
    private static Configuration s_config;

    public static Configuration Instance
    {
        get
        {
            if (s_config == null)
            {
                s_config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);
            }

            return s_config;
        }
    }
}

public class PageSettings : ConfigurationSection
{
    private static String SECTION_NAME = "pegeSettings";
    private static PageSettings s_instance;

    static PageSettings()
    {
        s_instance = Config.Instance.GetSection(SECTION_NAME) as PageSettings;

        if (s_instance == null)
        {
            s_instance = new PageSettings();
            s_instance.SectionInformation.AllowExeDefinition = ConfigurationAllowExeDefinition.MachineToLocalUser;
            Config.Instance.Sections.Add(SECTION_NAME, s_instance);
        }
    }

    public static PageSettings Instance
    {
        get
        {
            return s_instance;
        }
    }

    public void Save(System.Drawing.Printing.PageSettings a_settings)
    {
        Margins margins = PrinterUnitConvert.Convert(a_settings.Margins, 
            PrinterUnit.ThousandthsOfAnInch, PrinterUnit.TenthsOfAMillimeter);
        MarginLeft = margins.Left;
        MarginRight = margins.Right;
        MarginTop = margins.Top;
        MarginBottom = margins.Bottom;

        Landscape = a_settings.Landscape;
        PaperSizeName = a_settings.PaperSize.PaperName;
        PaperSourceName = a_settings.PaperSource.SourceName;

        Config.Instance.Save();
    }

    public void Restore(System.Drawing.Printing.PageSettings a_settings)
    {
        Margins margins = new Margins(MarginLeft, MarginRight, MarginTop, MarginBottom);
        margins = PrinterUnitConvert.Convert(margins, 
            PrinterUnit.TenthsOfAMillimeter, PrinterUnit.HundredthsOfAMillimeter);
        a_settings.Margins = margins;

        a_settings.Landscape = Landscape;

        foreach (PaperSize paper_size in a_settings.PrinterSettings.PaperSizes)
        {
            if (paper_size.PaperName == PaperSizeName)
                a_settings.PaperSize = paper_size;
        }

        foreach (PaperSource printer_source in a_settings.PrinterSettings.PaperSources)
        {
            if (printer_source.SourceName == PaperSourceName)
                a_settings.PaperSource = printer_source;
        }
    }

    [ConfigurationProperty("marginLeft", DefaultValue = 10)]
    public int MarginLeft
    {
        get
        {
            return (int)base["marginLeft"];
        }
        set
        {
            base["marginLeft"] = value;
        }
    }

    [ConfigurationProperty("marginRight", DefaultValue = 10)]
    public int MarginRight
    {
        get
        {
            return (int)base["marginRight"];
        }
        set
        {
            base["marginRight"] = value;
        }
    }

    [ConfigurationProperty("marginTop", DefaultValue = 10)]
    public int MarginTop
    {
        get
        {
            return (int)base["marginTop"];
        }
        set
        {
            base["marginTop"] = value;
        }
    }

    [ConfigurationProperty("marginBottom", DefaultValue = 10)]
    public int MarginBottom
    {
        get
        {
            return (int)base["marginBottom"];
        }
        set
        {
            base["marginBottom"] = value;
        }
    }

    [ConfigurationProperty("paperSourceName", DefaultValue = "")]
    public string PaperSourceName
    {
        get
        {
            return (string)base["paperSourceName"];
        }
        set
        {
            base["paperSourceName"] = value;
        }
    }

    [ConfigurationProperty("paperSizeName", DefaultValue = "")]
    public string PaperSizeName
    {
        get
        {
            return (string)base["paperSizeName"];
        }
        set
        {
            base["paperSizeName"] = value;
        }
    }

    [ConfigurationProperty("landscape", DefaultValue = false)]
    public bool Landscape
    {
        get
        {
            return (bool)base["landscape"];
        }
        set
        {
            base["landscape"] = value;
        }
    }
}