.NET 一些常用的类型转换扩展

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    /// <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     }