Runtime value to Attribute

[caulagi@iiitb.ac.in]

Hello!

I want to write -

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

i.e. CycleTime should be readonly or otherwise depending on the value
of form.IsFixedVal ue (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

[Ciaran O''Donnell]

RE: Runtime value to Attribute

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

Ciaran O'Donnell

"caulagi@iiitb. ac.in" wrote:

Hello!
>
I want to write -
>
[Persistent, ReadOnly(form.I sFixedValue)]
public double CycleTime
{
get { return cycletime; }
}
>
i.e. CycleTime should be readonly or otherwise depending on the value
of form.IsFixedVal ue (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
>
>

[caulagi@iiitb.ac.in]

Re: Runtime value to Attribute

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

TIA,
Pradip

Ciaran O''Donnell wrote:

I think you need to provide the setter still otherwise it has to be readonly
all the time.
>
Ciaran O'Donnell
>
"caulagi@iiitb. ac.in" wrote:
>

Hello!

I want to write -

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

i.e. CycleTime should be readonly or otherwise depending on the value
of form.IsFixedVal ue (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]

Re: Runtime value to Attribute

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

Marc

[Dave Sexton]

Re: Runtime value to Attribute

Hi,

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

--
Dave Sexton

"Marc Gravell" <marc.gravell@g mail.comwrote in message
news:%23EI3KnwB HHA.3536@TK2MSF TNGP03.phx.gbl. ..

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