/// <summary>
/// Compares one SmartDate to another.
/// </summary>
/// <remarks>
/// This method works the same as the CompareTo method
/// on the Date datetype, with the exception that it
/// understands the concept of empty date values.
/// </remarks>
/// <param name="Value">The date to which we are being compared.</param>
/// <returns>
/// A value indicating if the comparison date is less than,
/// equal to or greater than this date.</returns>
public int CompareTo(SmartDate date)
{
if (this.IsEmpty && date.IsEmpty)
{
return(0);
}
else
{
return(_date.CompareTo(date.Date));
}
}
public override bool Equals(object o)
{
if (o is SmartDate)
{
SmartDate tmp = o as SmartDate;
if (this.IsEmpty && tmp.IsEmpty)
{
return(true);
}
else
{
return(_date.Equals(((SmartDate)o).Date));
}
}
else if (o is DateTime)
{
return(_date.Equals((DateTime)o));
}
else
{
return(false);
}
}
/// <summary>
/// 檢查指定的 SmartDate 變數為 null 或空的日期。
/// </summary>
/// <param name="value">SmartDate 變數</param>
/// <returns>若為 </returns>
public static bool IsNullOrEmpty(SmartDate value)
{
return(value == null || value.IsEmpty);
}
