/// <summary>
/// Compares two <c>Period</c> values and returns an integer that indicates their relationship
/// </summary>
/// <param name="p1">The first period</param>
/// <param name="p2">The second period</param>
/// <returns>Returns -1 if the first instance is less than the second, 0 if they are equal, or 1 if the
/// first instance is greater than the second.</returns>
public static int Compare(Period p1, Period p2)
{
// Cast as object for null checks or it goes recursive
if((object)p1 == null && (object)p2 == null)
return 0;
if((object)p1 != null && (object)p2 == null)
return 1;
if((object)p1 == null && (object)p2 != null)
return -1;
if(p1.StartDateTime > p2.StartDateTime)
return 1;
if(p1.StartDateTime < p2.StartDateTime)
return -1;
if(p1.EndDateTime > p2.EndDateTime)
return 1;
if(p1.EndDateTime < p2.EndDateTime)
return -1;
return 0;
}
//=====================================================================
/// <summary>
/// Construct a new <c>Period</c> object from a period specified in a string. Parameters specify the
/// period and the variable where the new <c>Period</c> object is returned.
/// </summary>
/// <param name="period">The string that specifies the period.</param>
/// <param name="result">When this method returns, this contains an object that represents the period
/// specified by s, or an empty period object if the conversion failed. This parameter is passed in
/// uninitialized.</param>
/// <returns>True if successfully parsed or false if the value could not be parsed</returns>
public static bool TryParse(string period, out Period result)
{
try
{
result = new Period(period);
}
catch(ArgumentException )
{
result = new Period();
return false;
}
catch(OverflowException )
{
result = new Period();
return false;
}
return true;
}
//=====================================================================
/// <summary>
/// Returns a value indicating whether two specified instances of <c>Period</c> are equal
/// </summary>
/// <param name="p1">The first period to compare</param>
/// <param name="p2">The second period to compare</param>
/// <returns>Returns true if the periods are equal, false if they are not</returns>
public static bool Equals(Period p1, Period p2)
{
if((object)p1 == null && (object)p2 == null)
return true;
if((object)p1 == null)
return false;
return p1.Equals(p2);
}
/// <summary>
/// Copy constructor
/// </summary>
/// <param name="period">The period to copy</param>
public Period(Period period)
{
if(period != null)
{
this.StartDateTime = period.StartDateTime;
this.EndDateTime = period.EndDateTime;
this.Format = period.Format;
}
}
