字符串类型转换

//字符串转数字
        public static int StrToInt(string str, int defValue)
        {
            int num;
            if (int.TryParse(str, out num))
            {
                return num;
            }
            return defValue;
        }
        public static int StrToInt(string str)
        {
            return TypeConvert.StrToInt(str, 0);
        }
        //字符串转换为时间
        public static DateTime StrToDateTime(string str, DateTime defValue)
        {
            DateTime time;
            if (DateTime.TryParse(str, out time))
            {
                return time;
            }
            return defValue;
        }
        public static DateTime StrToDateTime(string str)
        {
            return TypeConvert.StrToDateTime(str, DateTime.Now);
        }
        //字符串转double
        public static double StrToDouble(string str, double defValue)
        {
            double res;
            if (double.TryParse(str, out res))
            {
                return res;
            }
            return defValue;
        }
        public static double StrToDouble(string str)
        {
            return TypeConvert.StrToDouble(str, 0f);
        }
        //object转数字
        public static int ObjectToInt(object obj, int defValue)
        {
            if (obj != null)
            {
                return TypeConvert.StrToInt(obj.ToString(), defValue);
            }
            return defValue;
        }
        public static int ObjectToInt(object obj)
        {
            return TypeConvert.ObjectToInt(obj, 0);
        }
        //object转时间
        public static DateTime ObjectToDateTime(object obj, DateTime defValue)
        {
            if (obj != null)
            {
                return TypeConvert.StrToDateTime(obj.ToString(), defValue);
            }
            return defValue;
        }
        public static DateTime ObjectToDateTime(object obj)
        {
            return TypeConvert.ObjectToDateTime(obj, DateTime.Now);
        }
        //object转换为double
        public static double ObjectToDouble(object obj, double defValue)
        {
            if (obj != null)
            {
                return TypeConvert.StrToDouble(obj.ToString(), defValue);
            }
            return defValue;
        }
        public static double ObjectToDouble(object obj)
        {
            return TypeConvert.ObjectToDouble(obj, 0f);
        }
        //object转string
        public static string ObjectToString(object obj, string defValue)
        {
            if (obj == null)
            {
                return defValue;
            }
            return obj.ToString();
        }
        public static String ObjectToString(object obj)
        {
            return TypeConvert.ObjectToString(obj, "");
        }