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一些常用的类型转换扩展

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记录下在开发中经常用到的类型转换

    /// <summary>    /// 转换扩展类    /// </summary>    public static partial class Extensions    {        #region 转换为long        /// <summary>        /// 将object转换为long,若转换失败,则返回0。不抛出异常。          /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static long ParseToLong(this object obj)        {            try            {                return long.Parse(obj.ToString() ?? string.Empty);            }            catch            {                return 0L;            }        }        /// <summary>        /// 将object转换为long,若转换失败,则返回指定值。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <param name="defaultValue"></param>        /// <returns></returns>        public static long ParseToLong(this string str, long defaultValue)        {            try            {                return long.Parse(str);            }            catch            {                return defaultValue;            }        }        #endregion        #region 转换为int        /// <summary>        /// 将object转换为int,若转换失败,则返回0。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static int ParseToInt(this object str)        {            try            {                return Convert.ToInt32(str);            }            catch            {                return 0;            }        }        /// <summary>        /// 将object转换为int,若转换失败,则返回指定值。不抛出异常。         /// null返回默认值        /// </summary>        /// <param name="str"></param>        /// <param name="defaultValue"></param>        /// <returns></returns>        public static int ParseToInt(this object str, int defaultValue)        {            if (str == null)            {                return defaultValue;            }            try            {                return Convert.ToInt32(str);            }            catch            {                return defaultValue;            }        }        #endregion        #region 转换为short        /// <summary>        /// 将object转换为short,若转换失败,则返回0。不抛出异常。          /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static short ParseToShort(this object obj)        {            try            {                return short.Parse(obj.ToString() ?? string.Empty);            }            catch            {                return 0;            }        }        /// <summary>        /// 将object转换为short,若转换失败,则返回指定值。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <param name="defaultValue"></param>        /// <returns></returns>        public static short ParseToShort(this object str, short defaultValue)        {            try            {                return short.Parse(str.ToString() ?? string.Empty);            }            catch            {                return defaultValue;            }        }        #endregion        #region 转换为demical        /// <summary>        /// 将object转换为demical,若转换失败,则返回指定值。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <param name="defaultValue"></param>        /// <returns></returns>        public static decimal ParseToDecimal(this object str, decimal defaultValue)        {            try            {                return decimal.Parse(str.ToString() ?? string.Empty);            }            catch            {                return defaultValue;            }        }        /// <summary>        /// 将object转换为demical,若转换失败,则返回0。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static decimal ParseToDecimal(this object str)        {            try            {                return decimal.Parse(str.ToString() ?? string.Empty);            }            catch            {                return 0;            }        }        #endregion        #region 转化为bool        /// <summary>        /// 将object转换为bool,若转换失败,则返回false。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static bool ParseToBool(this object str)        {            try            {                return bool.Parse(str.ToString() ?? string.Empty);            }            catch            {                return false;            }        }        /// <summary>        /// 将object转换为bool,若转换失败,则返回指定值。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <param name="result"></param>        /// <returns></returns>        public static bool ParseToBool(this object str, bool result)        {            try            {                return bool.Parse(str.ToString() ?? string.Empty);            }            catch            {                return result;            }        }        #endregion        #region 转换为float        /// <summary>        /// 将object转换为float,若转换失败,则返回0。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static float ParseToFloat(this object str)        {            try            {                return float.Parse(str.ToString() ?? string.Empty);            }            catch            {                return 0;            }        }        /// <summary>        /// 将object转换为float,若转换失败,则返回指定值。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <param name="result"></param>        /// <returns></returns>        public static float ParseToFloat(this object str, float result)        {            try            {                return float.Parse(str.ToString() ?? string.Empty);            }            catch            {                return result;            }        }        #endregion        #region 转换为Guid        /// <summary>        /// 将string转换为Guid,若转换失败,则返回Guid.Empty。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static Guid ParseToGuid(this string str)        {            try            {                return new Guid(str);            }            catch            {                return Guid.Empty;            }        }        #endregion        #region 转换为string        /// <summary>        /// 将object转换为string,若转换失败,则返回""。不抛出异常。          /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static string ParseToString(this object obj)        {            try            {                return obj == null ? string.Empty : obj.ToString();            }            catch            {                return string.Empty;            }        }        /// <summary>        ///         /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="obj"></param>        /// <returns></returns>        public static string ParseToStrings<T>(this object obj)        {            try            {                if (obj is IEnumerable<T> list)                {                    return string.Join(",", list);                }                return obj.ToString();            }            catch            {                return string.Empty;            }        }        #endregion        #region 转换为double        /// <summary>        /// 将object转换为double,若转换失败,则返回0。不抛出异常。          /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static double ParseToDouble(this object obj)        {            try            {                return double.Parse(obj.ToString() ?? string.Empty);            }            catch            {                return 0;            }        }        /// <summary>        /// 将object转换为double,若转换失败,则返回指定值。不抛出异常。          /// </summary>        /// <param name="str"></param>        /// <param name="defaultValue"></param>        /// <returns></returns>        public static double ParseToDouble(this object str, double defaultValue)        {            try            {                return double.Parse(str.ToString() ?? string.Empty);            }            catch            {                return defaultValue;            }        }        #endregion        #region 强制转换类型        /// <summary>        /// 强制转换类型        /// </summary>        /// <typeparam name="TResult"></typeparam>        /// <param name="source"></param>        /// <returns></returns>        public static IEnumerable<TResult> CastSuper<TResult>(this IEnumerable source)        {            return from object item in source select (TResult)Convert.ChangeType(item, typeof(TResult));        }        #endregion        #region 转换为ToUnixTime        public static long ParseToUnixTime(this DateTime nowTime)        {            var startTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);            return (long)Math.Round((nowTime - startTime).TotalMilliseconds, MidpointRounding.AwayFromZero);        }        #endregion        #region List转DataTable        /// <summary>        /// List转DataTable        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="list"></param>        /// <returns></returns>        public static DataTable ListToDataTable<T>(IEnumerable<T> list)        {            //创建属性的集合             List<PropertyInfo> pList = new List<PropertyInfo>();            //获得反射的入口             Type type = typeof(T);            DataTable dt = new DataTable();            //把所有的public属性加入到集合 并添加DataTable的列             Array.ForEach<PropertyInfo>(type.GetProperties(), p =>            {                pList.Add(p);                var theType = p.PropertyType;                //处理可空类型                if (theType.IsGenericType && theType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))                {                    dt.Columns.Add(p.Name, Nullable.GetUnderlyingType(theType));                }                else                {                    dt.Columns.Add(p.Name, theType);                }            });            foreach (var item in list)            {                //创建一个DataRow实例                 DataRow row = dt.NewRow();                //给row 赋值                 pList.ForEach(p =>                {                    var v = p.GetValue(item, null);                    row[p.Name] = v == null ? DBNull.Value : v;                });                //加入到DataTable                 dt.Rows.Add(row);            }            return dt;        }        /// <summary>        /// List转DataTable        /// </summary>        /// <param name="list"></param>        /// <returns></returns>        public static DataTable ListToDataTableNew(List<dynamic> list)        {            Dictionary<string, string> dic = new Dictionary<string, string>();            DataTable dt = new DataTable();            if (list != null && list.Count > 0)            {                foreach (var item in list[0])                {                    string text = item.ToString();                    string key = text.Substring(1, text.IndexOf(',') - 1);                    string value = text.Substring(text.IndexOf(',') + 1, text.Length - text.IndexOf(',') - 2);                    dt.Columns.Add(key);                }            }            foreach (var vlist in list)            {                DataRow row = dt.NewRow();                foreach (var item in vlist)                {                    string text = item.ToString();                    string key = text.Substring(1, text.IndexOf(',') - 1);                    string value = text.Substring(text.IndexOf(',') + 1, text.Length - text.IndexOf(',') - 2);                    //创建一个DataRow实例                     row[key] = value;                }                //加入到DataTable                 dt.Rows.Add(row);            }            return dt;        }        #endregion        #region 处理Excel单元格特殊字符        /// <summary>        /// 处理Excel单元格特殊字符        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static string ExcelCellHandle(string str)        {            return ToSBC(str.Replace("\n", string.Empty).Replace("_", string.Empty).Replace(" ", string.Empty).Replace("'", string.Empty));        }        /// <summary>        /// 转化为半角字符串(扩展方法)        /// </summary>        /// <param name="input">要转化的字符串</param>        /// <returns>半角字符串</returns>        public static string ToSBC(string input)//single byte charactor        {            char[] c = input.ToCharArray();            for (int i = 0; i < c.Length; i++)            {                if (c[i] == 12288)//全角空格为12288,半角空格为32                {                    c[i] = (char)32;                    continue;                }                if (c[i] > 65280 && c[i] < 65375)//其他字符半角(33-126)与全角(65281-65374)的对应关系是:均相差65248                    c[i] = (char)(c[i] - 65248);            }            return new string(c);        }        #endregion        #region 删除最后一个字符之后的字符        /// <summary>        /// 删除最后结尾的一个逗号        /// </summary>        public static string DelLastComma(string str)        {            return str.Substring(0, str.LastIndexOf(","));        }        /// <summary>        /// 删除最后结尾的指定字符后的字符        /// </summary>        public static string DelLastChar(string str, string strchar)        {            return str.Substring(0, str.LastIndexOf(strchar));        }        /// <summary>        /// 删除最后结尾的长度        /// </summary>        /// <param name="str"></param>        /// <param name="Length"></param>        /// <returns></returns>        public static string DelLastLength(string str, int Length)        {            if (string.IsNullOrEmpty(str))                return "";            str = str.Substring(0, str.Length - Length);            return str;        }        #endregion    }

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