这个C#类定义了读取AppSettings的配置文件的常用方法，通过这个类可以很容易从AppSettings配置文件读取字符串、数字、bool类型的字段信息。

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using System;
using System.Configuration;
 
namespace DotNet.Utilities
{
    /// <summary>
    /// web.config操作类
    /// </summary>
    public sealed class ConfigHelper
    {
        /// <summary>
        /// 得到AppSettings中的配置字符串信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetConfigString(string key)
        {
            string CacheKey = "AppSettings-" + key;
            object objModel = DataCache.GetCache(CacheKey);
            if (objModel == null)
            {
                try
                {
                    objModel = ConfigurationManager.AppSettings[key];
                    if (objModel != null)
                    {                       
                        DataCache.SetCache(CacheKey, objModel, DateTime.Now.AddMinutes(180), TimeSpan.Zero);
                    }
                }
                catch
                { }
            }
            return objModel.ToString();
        }
 
        /// <summary>
        /// 得到AppSettings中的配置Bool信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static bool GetConfigBool(string key)
        {
            bool result = false;
            string cfgVal = GetConfigString(key);
            if(null != cfgVal && string.Empty != cfgVal)
            {
                try
                {
                    result = bool.Parse(cfgVal);
                }
                catch(FormatException)
                {
                    // Ignore format exceptions.
                }
            }
            return result;
        }
        /// <summary>
        /// 得到AppSettings中的配置Decimal信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static decimal GetConfigDecimal(string key)
        {
            decimal result = 0;
            string cfgVal = GetConfigString(key);
            if(null != cfgVal && string.Empty != cfgVal)
            {
                try
                {
                    result = decimal.Parse(cfgVal);
                }
                catch(FormatException)
                {
                    // Ignore format exceptions.
                }
            }
 
            return result;
        }
        /// <summary>
        /// 得到AppSettings中的配置int信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static int GetConfigInt(string key)
        {
            int result = 0;
            string cfgVal = GetConfigString(key);
            if(null != cfgVal && string.Empty != cfgVal)
            {
                try
                {
                    result = int.Parse(cfgVal);
                }
                catch(FormatException)
                {
                    // Ignore format exceptions.
                }
            }
 
            return result;
        }
    }
}