小编use*_*064的帖子

过去3天我一直在网上搜索,但找不到任何关于这个问题的提法.我已经创建了一个自定义配置类,可以与我的app.config一起使用.一切正常.当不需要配置属性(配置元素)并且未在app.config中定义时,会出现此问题.似乎为配置属性返回默认值.有谁知道如何确定app.config中是否未定义该属性？(我一直试图发布我的app.config,但无法弄清楚如何做到这一点......谁知道怎么做？)

//Main
namespace TestStub
{
    class Program
    {
        static void Main(string[] args)
        {
            CustomSettingsHandler config = (CustomSettingsHandler)ConfigurationManager.GetSection("CustomSettingsManager");
            Console.WriteLine("Setting1 {0}", config.Setting1.CustomSettingItem);
            Console.WriteLine("Setting2 {0}", config.Setting2.CustomSettingItem);
        }
    }
}

//Custom Configuration Class
namespace CustomConfiguration
{
    public class CustomSettingsHandler : ConfigurationSection
    {
        [ConfigurationProperty("setting1", IsRequired = false)]
        public CustomSettingElement Setting1 { get { return (CustomSettingElement)this["setting1"]; } }

        [ConfigurationProperty("setting2", IsRequired = false)]
        public CustomSettingElement Setting2 { get { return (CustomSettingElement)this["setting2"]; } }
    }

    public class CustomSettingElement : ConfigurationElement
    {
        [ConfigurationProperty("customsettingitem", IsRequired = false)]
        public int CustomSettingItem …