Set default value to an image “public property”

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I try to set Default Value to an image Public Property of a UserControl.

What I have tried:

I tried to do that with a variable but with no luck...

VB

Private Image_ As Image = My.Resources.MyImage
<Category("Appearance")> <DisplayName("Image")> <DefaultValue(Image_)>
Public Property Image As Image
    Get
        Return NestedControl.Image
    End Get
    Set(ByVal value As Image)
        NestedControl.Image = value
    End Set
End Property

I also tried to set Default Value like this..

VB

<DefaultValue(GetType(Image), "My.Resources.MyImage")>

But when I click Reset to UserControl's property it turns to "None"!!! There is any other way I can do that?

Posted 29-Mar-18 1:26am

Simos Sigma

Updated 29-Mar-18 2:00am

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OriginalGriff · Answer 1 · 2018-03-29T02:01:00

Solution 1

Try this:

VB

Private Image_ As Image = My.Resources.MyImage
<Category("Appearance")> <DisplayName("Image")> 
Public Property Image As Image
    Get
        Return Image_
    End Get
    Set(ByVal value As Image)
        Image_ = value
    End Set
End Property

Posted 29-Mar-18 2:01am

OriginalGriff

Updated 29-Mar-18 2:32am

v2

Comments

Simos Sigma 29-Mar-18 8:16am

Nothing... DafaultValue is the problem. Gives me error "Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class"

OriginalGriff 29-Mar-18 8:43am

As an error message, that makes a lot of sense - you can't do that!
Remove the whole DefaultValue bit - I've deleted it from the solution.

Simos Sigma 29-Mar-18 8:48am

OK! Is there any other way so I can set default value in this case?

Maciej Los 29-Mar-18 9:08am

Take a look at your code and OriginalGriff's. Do you see the difference?

    Get
        'Return NestedControl.Image 'your
        Return Image_ 'OriginalGriff's
    End Get

In other words, you have to return Image_ when NestedControl.Image is null. ;)

Simos Sigma 29-Mar-18 9:11am

Yes my friend of course, but this doesn't enable the "Reset" option in properties window when I do right click on Image property!!!

Maciej Los 29-Mar-18 9:15am

See updated comment.

Simos Sigma 29-Mar-18 9:20am

Yes I saw it... Nothing!!! :(