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Recurrence rule exceptions

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Oscar Wahlen
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Oscar Wahlen asked on 16 May 2011, 04:40 PM
Could anyone provide an example of recurrence rule exception in the latest build (2011.1 419 )? In the documentation it says you must use the AddException method. But I could not find it.

Thanks.

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Yana
Telerik team
answered on 19 May 2011, 02:38 PM
Hello Oscar,

AddException is a method of the ReccurrenceRule which is set to the appointment. If you provide only one DateTime parameter to the AddException method, the given occurrence will be removed from the recurrence. Note that you should specify the exact Start time of the occurrence. Here is an example of a recurrent appointment with an exception:

var now = DateTime.Now;
var pattern =
new RecurrencePattern() {           
    Frequency = RecurrenceFrequency.Weekly
};
var rule = new RecurrenceRule(pattern);
rule.AddException(now.AddDays(7));
var recurrentApp = new Appointment()
{
    Subject = "recurrent app",
    Start = now,
    End = now.AddHours(1),
    RecurrenceRule = rule
};

If you need to keep the appointment occurrence but change any of its properties (Subject, Start, End..), you should provide two parameters to the AddException method - again DateTime and the exception appointment:

var now = DateTime.Now;
var pattern =
new RecurrencePattern() {           
    Frequency = RecurrenceFrequency.Weekly
};          
var recurrentApp = new Appointment()
{
    Subject = "recurrent app",
    Start = now,
    End = now.AddHours(1)                       
};
var rule = new RecurrenceRule(pattern);          
            
rule.AddException(now, recurrentApp.Copy());
recurrentApp.RecurrenceRule = rule;

Hope this help.

Greetings,
Yana
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Oscar Wahlen
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Yana
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