How to add a variable to a class dynamically with out modifying the original class

Question

I want to add a variable to a class without modifying the original class. The class can not be modified in anyway because it is tie to an api and would cause build errors if modified. Currently the view is displaying all the variables in the class, I want to add a variable to this class during runtime to display to the view.

public class EventSummaryDto
{
    public long Id { get; set; }
    public string DeviceId { get; set; }
    public DateTime EventTime { get; set; }
    public int EventCode { get; set; }
    public string EventName { get; set; }
    public int DigitalPositionMM { get; set; }
    public string ControllerType { get; set; }

}

What do you mean with 'dynamically'? What exactly are you trying to achieve? — Pieter Witvoet, Mar 30 '17 at 16:16
You can use `Reflection` to do that...or you can use the `ExpandoObject` class https://msdn.microsoft.com/en-us/library/system.dynamic.expandoobject(v=vs.110).aspx — Hackerman, Mar 30 '17 at 16:16
I think, you could create your custom class and then map your fields to Dto. — Yehor Hromadskyi, Mar 30 '17 at 16:17
You can't. You can create a new class that inherits from this one. See http://stackoverflow.com/questions/646258/how-can-i-dynamically-add-a-field-to-a-class-in-c-sharp — BurnsBA, Mar 30 '17 at 16:18
It really would help if you explained why you want to do this. — Dour High Arch, Mar 30 '17 at 16:39

score 1 · Accepted Answer · answered Mar 30 '17 at 17:21

1

typically, this is what you would use inheritance for

public class ExpandedEventSummary : EventSummaryDto
{
    public string MyExtraProperty { get; set; }
}

answered Mar 30 '17 at 17:21

Jason

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How to add a variable to a class dynamically with out modifying the original class

1 Answers1