/// <summary>
/// To nullable TimeSpan
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static DateTimeSpan?CastToNullableDateTimeSpan(this string str)
{
if (StringDateTimeSpanDeterminer.Is(str))
{
return(CastToDateTimeSpan(str));
}
return(null);
}
/// <summary>
/// Convert the given string to a nullable <see cref="DateTimeSpan"/>. <br />
/// 将给定的字符串转换为可空的 <see cref="DateTimeSpan"/>。
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static DateTimeSpan?CastToNullableDateTimeSpan(this string str)
{
return(StringDateTimeSpanDeterminer.Is(str)
? CastToDateTimeSpan(str)
: (DateTimeSpan?)null);
}