asp.net 数据类型转换类代码

using system;
using system.collections.generic;
using system.text;
using system.text.regularexpressions;
namespace typeclass
{
public class typeparse
{
/// <summary>
/// 判断对象是否为int32类型的数字
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public static bool isnumeric(object expression)
{
if (expression != null)
{
int intval;
return int.tryparse(expression.tostring(), out intval);
}
return false;
}
public static bool isdouble(object expression)
{
if (expression != null)
{
double doubleval;
return double.tryparse(expression.tostring(), out doubleval);
}
return false;
}
/// <summary>
/// string型转换为bool型
/// </summary>
/// <param name="strvalue">要转换的字符串</param>
/// <param name="defvalue">缺省值</param>
/// <returns>转换后的bool类型结果</returns>
public static bool strtobool(object expression, bool defvalue)
{
if (expression != null)
{
bool boolvalue;
if (bool.tryparse(expression.tostring(), out boolvalue))
return boolvalue;
else
return defvalue;
}
return defvalue;
}
/// <summary>
/// 将对象转换为int32类型
/// </summary>
/// <param name="strvalue">要转换的字符串</param>
/// <param name="defvalue">缺省值</param>
/// <returns>转换后的int32类型结果</returns>
public static int strtoint(object expression, int defvalue)
{
if (expression != null)
{
int intvalue;
if (int.tryparse(expression.tostring(), out intvalue))
return intvalue;
else
return defvalue;
}
return defvalue;
}
/// <summary>
/// string型转换为float型
/// </summary>
/// <param name="strvalue">要转换的字符串</param>
/// <param name="defvalue">缺省值</param>
/// <returns>转换后的float类型结果</returns>
public static float strtofloat(object strvalue, float defvalue)
{
if (strvalue != null)
{
float floatvalue;
if (float.tryparse(strvalue.tostring(), out floatvalue))
return floatvalue;
else
return defvalue;
}
return defvalue;
}
/// <summary>
/// string型转换为decimal型
/// </summary>
/// <param name="strvalue">要转换的字符串</param>
/// <param name="defvalue">缺省值</param>
/// <returns>转换后的decimal类型结果</returns>
public static decimal strtodecimal(object strvalue, decimal defvalue)
{
if (strvalue != null)
{
decimal decimalvalue;
if (decimal.tryparse(strvalue.tostring(), out decimalvalue))
return math.round(decimalvalue,2);
else
return defvalue;
}
return defvalue;
}
/// <summary>
/// string型转换为datetime型
/// </summary>
/// <param name="strvalue">要转换的字符串</param>
/// <param name="defvalue">缺省值</param>
/// <returns>转换后的datetime类型结果</returns>
public static datetime strtodatetime(object strvalue, datetime defvalue)
{
if (strvalue != null)
{
datetime datetimevalue;
if (datetime.tryparse(strvalue.tostring(), out datetimevalue))
return datetimevalue;
else
return defvalue;
}
return defvalue;
}
/// <summary>
/// 判断给定的字符串数组(strnumber)中的数据是不是都为数值型
/// </summary>
/// <param name="strnumber">要确认的字符串数组</param>
/// <returns>是则返加true 不是则返回 false</returns>
public static bool isnumericarray(string[] strnumber)
{
if (strnumber == null)
{
return false;
}
if (strnumber.length < 1)
{
return false;
}
foreach (string id in strnumber)
{
if (!isnumeric(id))
{
return false;
}
}
return true;
}
}
}