AppConfigHelper 武胜

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Text;
using log4net;

namespace xt {
    public class AppConfigHelper {
        private static ILog log = LogManager.GetLogger(typeof (AppConfigHelper));
        
        public static int? Get(string key, int? defaultValue) {
            string s = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrEmpty(s)) {
                log.WarnFormat("The key {1} is not configured, using default: {0}", defaultValue, key);
            } else {
                int v;
                if (!int.TryParse(s, out v)) {
                    log.WarnFormat("The key {1} is not properly configured, using default: {0}", defaultValue, key);
                } else {
                    defaultValue = v;
                    log.InfoFormat("Get: {0}={1}", key, defaultValue);
                }
            }
            return defaultValue;
        }
        
        public static bool? Get(string key, bool? defaultValue) {
            string s = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrEmpty(s)) {
                log.WarnFormat("The key {1} is not configured, using default: {0}", defaultValue, key);
            } else {
                bool v;
                if (!bool.TryParse(s, out v)) {
                    log.WarnFormat("The key {1} is not properly configured, using default: {0}", defaultValue, key);
                } else {
                    defaultValue = v;
                    log.InfoFormat("Get: {0}={1}", key, defaultValue);
                }
            }
            return defaultValue;
        }

        public static T GetEnum<T>(string key, T defaultValue) {
            string s = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrEmpty(s)) {
                log.WarnFormat("The key {1} is not configured, using default: {0}", defaultValue, key);
                return defaultValue;
            } else {
                T v = (T) Enum.Parse(typeof (T), s);
                log.InfoFormat("Get: {0}={1}", key, defaultValue);
                return v;
            }
        }
        
        public static string Get(string key, string defaultValue) {
            string s = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrEmpty(s)) {
                log.WarnFormat("The key {1} is not configured, using default: {0}", defaultValue, key);
                return defaultValue;
            }
            log.InfoFormat("Get: {0}={1}", key, s);
            return s;
        }

        public static DateTime Get(string key, DateTime defaultValue) {
            string s = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrEmpty(s)) {
                log.WarnFormat("The key {1} is not configured, using default: {0}", defaultValue, key);
                return defaultValue;
            }
            DateTime result;
            if(!DateTime.TryParse(s, out result)) {
                log.WarnFormat("The key {0} is not properly configured, using default: {1} isntead of {3}", key, defaultValue, s);
                return defaultValue;
            }
            log.InfoFormat("Get: {0}={1}", key, s);
            return result;
        }

        public static TimeSpan Get(string key, TimeSpan defaultValue) {
            string s = ConfigurationManager.AppSettings[key];
            if (string.IsNullOrEmpty(s)) {
                log.WarnFormat("The key {1} is not configured, using default: {0}", defaultValue, key);
                return defaultValue;
            }
            TimeSpan result;
            if (!TimeSpan.TryParse(s, out result)) {
                log.WarnFormat("The key {0} is not properly configured, using default: {1} isntead of {3}", key, defaultValue, s);
                return defaultValue;
            }
            log.InfoFormat("Get: {0}={1}", key, s);
            return result;
        }
    }