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;
    }
  }
}