[RESOLVED] How can I set an image as DefaultValue Attribute to a UserControl Property?

[Simonetos The Greek]

Actually you could pull it off but it'd take some magic. A lot of what JMC said is false and imagination reveals the truth.

You can make your own type converter for the property that converts a String to an Image. That part doesn't take much imagination. How do you represent an Image as a String? Well, you have options.

The String could represent the name of some embedded resource. Then it'd be the converter's job to get that image. Or: you could encode the image as a Base64 string, and the type converter could decode it to a Byte array, then convert that to an Image.

Thank you for your valuable answer my friend!!! I'll study the informations you gave me for sure. Last days that I am looking for answers to similarly questions, almost everywhere, I read about this Type Converter and I think is a part which I should study for sure.

However, I took a working solution from a guy from an other programming community and I would like to share it with you.

He wrote:

While the System.ComponentModel.DefaultValueAttribute does not support this, you can use the old-style ResetPropertyName and ShouldSerializePropertyName methods to achieve the same function.

Imports System.ComponentModel

Public Class MyUserControl
    Private Image_ As Image = My.Resources.MyImage

    Public Sub New()
        InitializeComponent()
        ResetImage() ' set default
    End Sub

    <Category("Appearance")> <DisplayName("Image")> <Description("...")>
    Public Property Image As Image
        Get
            Return NestedControl.Image
        End Get
        Set(ByVal value As Image)
            NestedControl.Image = value
        End Set
    End Property

    Public Sub ResetImage()
        If Image IsNot Nothing Then Image.Dispose()
        Image = Image_
    End Sub

    Public Function ShouldSerializeImage() As Boolean
        Return (Image IsNot Image_)
    End Function
End Class