加密和解密.net配置节

public static class ProtectConfigFileUtil
{
/// <summary>
/// 加密配置节示例，加密 ConnectionStrings 和 AppSettings
/// </summary>
    [Obsolete("这个方法只是示例")]
public static void ProtectConnectionStringsAndAppSettings(HttpContext context)
    {
        Configuration config = WebConfigurationManager.OpenWebConfiguration(context.Request.ApplicationPath);

//' Define the Dpapi provider name.
        String provider = "DataProtectionConfigurationProvider";

        ProtectSection(config.ConnectionStrings, provider);
        ProtectSection(config.AppSettings, provider);

        config.Save(System.Configuration.ConfigurationSaveMode.Modified);
    }

/// <summary>
/// 加密一个配置节
/// </summary>
/// <param name="section"></param>
/// <param name="provider"></param>
/// <returns></returns>
    public static bool ProtectSection(ConfigurationSection section, String provider)
    {
if (section != null
&& !section.SectionInformation.IsProtected
&& !section.ElementInformation.IsLocked)
        {
// ' Protect the section.
            section.SectionInformation.ProtectSection(provider);
            section.SectionInformation.ForceSave = true;
return true;
        }

return false;
    }
/// <summary>
/// 解密一个配置节
/// </summary>
/// <param name="section"></param>
/// <returns></returns>
    public static bool UnprotectSection(ConfigurationSection section)
    {
if (section != null
&& !section.SectionInformation.IsProtected
&& !section.ElementInformation.IsLocked)
        {
// ' Protect the section.
            section.SectionInformation.UnprotectSection();
            section.SectionInformation.ForceSave = true;
return true;
        }

return false;
    }


}