/*  作者：       季健国
*  创建时间：   2012/7/22 15:38:20
*
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Ant.Service.Common
{
    /// <summary>
    /// 强制转化辅助类(无异常抛出)
    /// </summary>
    public static class ConvertHelper
    {
        #region 强制转化
        /// <summary>
        /// object转化为Bool类型
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static bool ObjToBool(this object obj)
        {
            bool flag;
            if (obj == null)
            {
                return false;
            }
            if (obj.Equals(DBNull.Value))
            {
                return false;
            }
            return (bool.TryParse(obj.ToString(), out flag) && flag);
        }
        /// <summary>
        /// object强制转化为DateTime类型(吃掉异常)
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static DateTime? ObjToDateNull(this object obj)
        {
            if (obj == null)
            {
                return null;
            }
            try
            {
                return new DateTime?(Convert.ToDateTime(obj));
            }
            catch //(ArgumentNullException ex)
            {
                return null;
            }
        }
        /// <summary>
        /// int强制转化
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static int ObjToInt(this object obj)
        {
            if (obj != null)
            {
                int num;
                if (obj.Equals(DBNull.Value))
                {
                    return 0;
                }
                if (int.TryParse(obj.ToString(), out num))
                {
                    return num;
                }
            }
            return 0;
        }
        /// <summary>
        /// 强制转化为long
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static long ObjToLong(this object obj)
        {
            if (obj != null)
            {
                long num;
                if (obj.Equals(DBNull.Value))
                {
                    return 0;
                }
                if (long.TryParse(obj.ToString(), out num))
                {
                    return num;
                }
            }
            return 0;
        }
        /// <summary>
        /// 强制转化可空int类型
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static int? ObjToIntNull(this object obj)
        {
            if (obj == null)
            {
                return null;
            }
            if (obj.Equals(DBNull.Value))
            {
                return null;
            }
            return new int?(ObjToInt(obj));
        }
        /// <summary>
        /// 强制转化为string
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ObjToStr(this object obj)
        {
            if (obj == null)
            {
                return "";
            }
            if (obj.Equals(DBNull.Value))
            {
                return "";
            }
            return Convert.ToString(obj);
        }
        /// <summary>
        /// Decimal转化
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static decimal ObjToDecimal(this object obj)
        {
            if (obj == null)
            {
                return 0M;
            }
            if (obj.Equals(DBNull.Value))
            {
                return 0M;
            }
            try
            {
                return Convert.ToDecimal(obj);
            }
            catch
            {
                return 0M;
            }
        }
        /// <summary>
        /// Decimal可空类型转化
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static decimal? ObjToDecimalNull(this object obj)
        {
            if (obj == null)
            {
                return null;
            }
            if (obj.Equals(DBNull.Value))
            {
                return null;
            }
            return new decimal?(ObjToDecimal(obj));
        } 
        #endregion

        /// <summary>
        /// 利用反射来判断对象是否包含某个属性
        /// </summary>
        /// <param name="instance">object</param>
        /// <param name="propertyName">需要判断的属性</param>
        /// <returns>是否包含</returns>
        public static bool ContainProperty(this object instance, string propertyName)
        {
            if (instance != null && !string.IsNullOrEmpty(propertyName))
            {
                System.Reflection.PropertyInfo _findedPropertyInfo = instance.GetType().GetProperty(propertyName);
                return (_findedPropertyInfo != null);
            }
            return false;
        }
    }
}