.NET 一些常用的類型轉(zhuǎn)換擴展

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記錄下在開發(fā)中經(jīng)常用到的類型轉(zhuǎn)換
        #region 轉(zhuǎn)換為string
        /// <summary>
        /// 將object轉(zhuǎn)換為string，若轉(zhuǎn)換失敗，則返回""。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ParseToString(this object obj)
        {
            return Convert.ToString(obj) ?? string.Empty;
        }
        #endregion

        #region 轉(zhuǎn)換為long
        /// <summary>
        /// 將object轉(zhuǎn)換為long，若轉(zhuǎn)換失敗，則返回0。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static long ParseToLong(this object obj)
        {
            if (obj == null)
            {
                return 0;
            }
            else
            {
                bool boolean = long.TryParse(obj.ToString() ?? string.Empty, out long result);
                return result;
            }
        }

        /// <summary>
        /// 將object轉(zhuǎn)換為long，若轉(zhuǎn)換失敗，則返回指定值。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        public static long ParseToLong(this object obj, long defaultValue)
        {
            if (obj == null)
            {
                return defaultValue;
            }
            else
            {
                bool boolean = long.TryParse(obj.ToString() ?? string.Empty, out long result);
                if (boolean)
                    return result;
                else
                    return defaultValue;
            }
        }

        #endregion

        #region 轉(zhuǎn)換為int
        /// <summary>
        /// 將object轉(zhuǎn)換為int，若轉(zhuǎn)換失敗，則返回0。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static int ParseToInt(this object obj)
        {
            if (obj == null)
            {
                return 0;
            }
            else
            {
                bool boolean = int.TryParse(obj.ToString() ?? string.Empty, out int result);
                return result;
            }
        }

        /// <summary>
        /// 將object轉(zhuǎn)換為int，若轉(zhuǎn)換失敗，則返回指定值。不拋出異常。 
        /// null返回默認值
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        public static int ParseToInt(this object obj, int defaultValue)
        {
            if (obj == null)
            {
                return defaultValue;
            }
            else
            {
                bool boolean = int.TryParse(obj.ToString() ?? string.Empty, out int result);
                if (boolean)
                    return result;
                else
                    return defaultValue;
            }
        }

        #endregion

        #region 轉(zhuǎn)換為double

        /// <summary>
        /// 將object轉(zhuǎn)換為double，若轉(zhuǎn)換失敗，則返回0。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static double ParseToDouble(this object obj)
        {

            if (obj == null)
            {
                return 0;
            }
            else
            {
                bool boolean = double.TryParse(obj.ToString() ?? string.Empty, out double result);
                return result;
            }
        }

        /// <summary>
        /// 將object轉(zhuǎn)換為double，若轉(zhuǎn)換失敗，則返回指定值。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        public static double ParseToDouble(this object obj, double defaultValue)
        {
            if (obj == null)
            {
                return defaultValue;
            }
            else
            {
                bool boolean = double.TryParse(obj.ToString() ?? string.Empty, out double result);
                if (boolean)
                    return result;
                else
                    return defaultValue;
            }
        }

        #endregion

        #region 轉(zhuǎn)換為demical
        /// <summary>
        /// 將object轉(zhuǎn)換為demical，若轉(zhuǎn)換失敗，則返回0。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static decimal ParseToDecimal(this object obj)
        {
            if (obj == null)
            {
                return 0;
            }
            else
            {
                bool boolean = decimal.TryParse(obj.ToString() ?? string.Empty, out decimal result);
                return result;
            }
        }

        /// <summary>
        /// 將object轉(zhuǎn)換為demical，若轉(zhuǎn)換失敗，則返回指定值。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        public static decimal ParseToDecimal(this object obj, decimal defaultValue)
        {
            if (obj == null)
            {
                return defaultValue;
            }
            else
            {
                bool boolean = decimal.TryParse(obj.ToString() ?? string.Empty, out decimal result);
                if (boolean)
                    return result;
                else
                    return defaultValue;
            }
        }
        #endregion

        #region 轉(zhuǎn)化為bool
        /// <summary>
        /// 將object轉(zhuǎn)換為bool，若轉(zhuǎn)換失敗，則返回false。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static bool ParseToBool(this object obj)
        {
            if (obj == null)
            {
                return false;
            }
            else
            {
                bool boolean = bool.TryParse(obj.ToString() ?? string.Empty, out bool result);
                return result;
            }
        }

        /// <summary>
        /// 將object轉(zhuǎn)換為bool，若轉(zhuǎn)換失敗，則返回指定值。不拋出異常。  
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="defaultValue"></param>
        /// <returns></returns>
        public static bool ParseToBool(this object obj, bool defaultValue)
        {
            if (obj == null)
            {
                return defaultValue;
            }
            else
            {
                bool boolean = bool.TryParse(obj.ToString() ?? string.Empty, out bool result);
                if (boolean)
                    return result;
                else
                    return defaultValue;
            }
        }

        #endregion

        #region 時間與時間戳轉(zhuǎn)換
        /// <summary>
        /// 時間轉(zhuǎn)換為毫秒時間戳
        /// </summary>
        /// <param name="nowTime"></param>
        /// <returns>時間戳(毫秒)</returns>
        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 刪除最后一個字符之后的字符
        /// <summary>
        /// 刪除最后結(jié)尾的一個逗號
        /// </summary>
        public static string DelLastComma(string str)
        {
            return str.Substring(0, str.LastIndexOf(","));
        }
        /// <summary>
        /// 刪除最后結(jié)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>
        /// 刪除最后結(jié)尾的長度
        /// </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

        #region 強制轉(zhuǎn)換類型
        /// <summary>
        /// 強制轉(zhuǎn)換類型
        /// </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 List轉(zhuǎn)DataTable
        /// <summary>
        /// List轉(zhuǎn)DataTable
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <returns></returns>
        public static DataTable ListToDataTable<T>(IEnumerable<T> list)
        {
            //創(chuàng)建屬性的集合 
            List<PropertyInfo> pList = new List<PropertyInfo>();
            //獲得反射的入口 
            Type type = typeof(T);
            DataTable dt = new DataTable();
            //把所有的public屬性加入到集合 并添加DataTable的列 
            Array.ForEach<PropertyInfo>(type.GetProperties(), p =>
            {
                pList.Add(p);
                var theType = p.PropertyType;
                //處理可空類型
                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)
            {
                //創(chuàng)建一個DataRow實例 
                DataRow row = dt.NewRow();
                //給row 賦值 
                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轉(zhuǎn)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);
                    //創(chuàng)建一個DataRow實例 
                    row[key] = value;
                }
                //加入到DataTable 
                dt.Rows.Add(row);
            }
            return dt;
        }
        #endregion