Runtime value to Attribute

[caulagi]

Hello!

I want to write -

[Persistent, ReadOnly(form.IsFixedValue)]
public double CycleTime
{
get { return cycletime; }
}

i.e. CycleTime should be readonly or otherwise depending on the value
of form.IsFixedValue (IsFixedValue is a property of the form).

But the above code doesn't work (of course). Is there a way to get it
to work the way I want?

TIA,

Pradip

 

[Guest]

I think you need to provide the setter still otherwise it has to be readonly
all the time.

Ciaran O'Donnell

 

[caulagi]

Yes, of course. Assuming I have a setter also in place, how can I make
CycleTime readonly or otherwise, depending on form.IsFixedValue?

TIA,
Pradip

I think you need to provide the setter still otherwise it has to be readonly
all the time.

Ciaran O'Donnell

Hello!

I want to write -

[Persistent, ReadOnly(form.IsFixedValue)]
public double CycleTime
{
get { return cycletime; }
}

i.e. CycleTime should be readonly or otherwise depending on the value
of form.IsFixedValue (IsFixedValue is a property of the form).

But the above code doesn't work (of course). Is there a way to get it
to work the way I want?

TIA,

Pradip

 

[Marc Gravell]

AFAIK you can't without some hacking in the component model and
ICustomTypeDescriptor (and this would only affect things like PropertyGrid -
not compiled code). You can (and should), however, simply make the setter
throw an exception (InvalidOperationException) if it is used incorrectly.

Marc

 

[Dave Sexton]

Hi,

And throwing an exception is usually fine in the designer because it's caught,
and then displayed in a nice little message box