How do I validate the values entered for custom control properties?

[Nathan Sokalski]

I have a custom control with properties named MinValue, MaxValue, and Value
(all of which I have assigned a DefaultValue design-time attribute). The
Value property must be between (or equal to) the MinValue and MaxValue
properties in order to avoid a runtime error. I want to give an error during
the usage of the control stating this, as well as prevent it from compiling
under these conditions. Because this is something I have never done with
custom controls before, I need some help here. Thanks.

 

[G Himangi]

One way would be to throw an exception if the value is out of range - Visual
Studio will catch this exception and not allow the user to change to invalid
values.


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- G Himangi, Sky Software http://www.ssware.com
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[Nathan Sokalski]

That will not work in all situations. For example, if the current values are
MinValue=75, MaxValue=100, Value=80 and the user wants to change them to
MinValue=25, MaxValue=50, Value=40. This will force the user to change them
in a certain order, which could be very annoying. I want the user to be
notified, but still be allowed to change them, and simply not be allowed to
compile it if they are out of range. Also, if I did use your exception idea,
where in my code would I put it? Thanks.