.NET 一些常用的类型转换扩展
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 = 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)
{
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 = 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 == 12288)//全角空格为12288，半角空格为32
{
c = (char)32;
continue;
}
if (c > 65280 && c < 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 = (char)(c - 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
}
来源:https://www.cnblogs.com/caojiming/archive/2023/10/16/17767080.html
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