private static TimeSpan ConvertResult(DurationVisitor visitor)
{
return(TimeSpan.Zero
.Add(TimeSpan.FromDays(visitor.Weeks * 7))
.Add(TimeSpan.FromDays(visitor.Days))
.Add(TimeSpan.FromHours(visitor.Hours))
.Add(TimeSpan.FromMinutes(visitor.Minutes))
.Add(TimeSpan.FromSeconds(visitor.Seconds)));
}
/// <summary>
/// Converts the ISO 8601 string representation of a duration to its equivalent
/// .NET <see cref="TimeSpan"/> representation.
/// A return value indicates whether the conversion succeeded or failed.
/// </summary>
/// <remarks>
/// The year (Y) and month (M) designators are currently unsupported. If these
/// designators are encountered, the method will return <see langword="false"/>.
/// <para>
/// These are problematic because of things like leap years, Daylight Savings Time, etc.
/// More information is needed in order to convert to a <see cref="TimeSpan"/>;
/// for that, a more powerful library such as NodaTime would be appropriate.
/// </para>
/// </remarks>
/// <param name="duration">The ISO 8601 duration, excluding year (Y) and month (M) designators.
/// </param>
/// <param name="timeSpan">
/// When the method returns, this parameter is set to the resulting <see cref="TimeSpan"/>
/// if the conversion was successful, or <c>default(TimeSpan)</c> if the conversion was unsuccessful.</param>
/// <returns><see langword="true"/> if the conversion succeeded; <see langword="false"/> otherwise.</returns>
public static bool TryParse(string duration, out TimeSpan timeSpan)
{
timeSpan = default(TimeSpan);
var result = DurationVisitor.Parse(duration);
if (result.Valid)
{
timeSpan = ConvertResult(result);
}
return(result.Valid);
}