Heh.. . .Font is a different ball of wax. You don't want to use DefaultValue on Font
because you can only specify Static values. You should create a ShouldSerializeFont
method on the class that defines the property. So, something like this:
<code snippet = C#>
private bool ShouldSerializeFont()
{
return !Font.Equals(new Font("Comic Sans MS", 2, FontStyle.Bold);
}
</code snippet>
Jacob A. Grass
> -----Original Message-----
> From: Jeff [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, May 16, 2002 1:29 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [DOTNET] DefaultValue() Attribute Question
>
>
> The continuing saga:
>
> Color worked just fine as noted in earlier replies.
>
> DefaultValue(typeof(Color), "Control")
>
> Font is another story. In looking at the info for the DefaultValue
> constructor:
>
> =========================
> [C#]
> [AttributeUsage(AttributeTargets.All)]
> public DefaultValueAttribute(Type type, string value);
>
> Parameters
> type
> A Type that represents the type to convert the value to.
> value
> A String that can be converted to the type using the
> TypeConverter for
> the type and the U.S. English culture.
>
> =========================
>
> I can't see why the following would fail for a custom font property:
>
> DefaultValue(typeof(Font), "Microsoft Sans Serif, 8.25pt")
>
> Everything compiles okay, but when you look at the unchanged
> property in
> the property grid, it still highlights bold falsely denoting
> a change from
> the default value.
>
> The constructor documentation above says this all uses the
> TypeConverter
> for the type, so closer experimentation with the
> FontConverter yields the
> following results where the myControl.AltFont is a certified,
> unchanged
> default font.
>
>
> new System.Drawing.FontConverter().ConvertToString(myControl.AltFont)
>
> gives me "Microsoft Sans Serif, 8.25pt". I get the same
> result from using
> ConvertToInvariantString().
>
> Likewise:
>
> myControl.AltFont = (Font) new System.Drawing.FontConverter
> ().ConvertFromString("Microsoft Sans Serif, 8.25pt")
>
> does yield a good, default font value that I can assign to a
> control and
> see it really is the plain old vanilla default.
> ConvertFromInvariantString
> () yields the same results.
>
> The cast is necessary above because the ConvertFromString
> returns an object
> rather than a true Font.
>
> I was concerned that the ColorConverter and the FontConverter were
> different here, but the ConvertFromString() methods on both
> return object
> rather than the type, so the constructor must be handling the
> casting down
> inside somewhere since it works for Color.
>
> I don't understand why
>
> DefaultValue(typeof(Color), "Control")
>
> works properly to signify a default value for a color in the
> property grid,
> but
>
> DefaultValue(typeof(Font), "Microsoft Sans Serif, 8.25pt")
>
> does not work properly for a font.
>
> Anyone else know the real story on this one?
>
> Any help would be appreciated.
>
> Jeff
>
>
> On Thu, 16 May 2002 06:25:11 -0700, Jeff <[EMAIL PROTECTED]>
> wrote:
>
> >On Thu, 16 May 2002 07:45:51 -0500, Jacob Grass
> ><[EMAIL PROTECTED]> wrote:
> >
> >>DefaultValue(GetType(Color), "Control")
> >
> >Thanks, I should have read ALL the overloads more carefully
> to see the one
> >that included type.
> >
> >However, this still does not work because the compiler reports:
> >"'System.Drawing.Color' denotes a 'class' where a 'variable'
> was expected"
> >
> >I did find, however, that the following (C#) DOES work perfectly:
> >
> >DefaultValue(typeof(Color), "Control")
> >
> >Thanks so much for pointing me to that overload, DOH!!!
> >
> >Jeff
> >
>
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