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Hello I am creating a User Control and wanted to have a custom object property ImageChange.

I google this and found this link Getting the Most Out of the .NET Framework PropertyGrid Control[^].

Everything seems working when I run the User Control Project, can change the property (On code or manual) and prompts its current value. But when I add the User Control to another windows form project I got an error. Please see image[^]. This error occurs when I try changing the ImageChange property and saving the project.

Below is the code
VB
Public Class UserControl
    Private _imageChange As New ImageChange
    Public Property OnImageChange As ImageChange
        Get
            Return Me._imageChange
        End Get
        Set(value As ImageChange)
            Me._imageChange = value
        End Set
    End Property
End Class

<ComponentModel.TypeConverter(GetType(ImageChangeConverter))>
Public Class ImageChange

    Private _zoom As Boolean = False
    Private _rotate As Boolean = False

    Public Property RetainZoom As Boolean
        Get
            Return Me._zoom
        End Get
        Set(value As Boolean)
            Me._zoom = value
        End Set
    End Property

    Public Property RetainRotate As Boolean
        Get
            Return Me._rotate
        End Get
        Set(value As Boolean)
            Me._rotate = value
        End Set
    End Property
End Class

Public Class ImageChangeConverter
    Inherits ComponentModel.ExpandableObjectConverter

    Public Overloads Overrides Function CanConvertTo(ByVal context As ComponentModel.ITypeDescriptorContext, ByVal destinationType As Type) As Boolean
        If (destinationType Is GetType(ImageChange)) Then Return True
        Return MyBase.CanConvertFrom(context, destinationType)
    End Function

    Public Overloads Overrides Function ConvertTo(ByVal context As ComponentModel.ITypeDescriptorContext, ByVal culture As Globalization.CultureInfo, ByVal value As Object, ByVal destinationType As System.Type) As Object
        If (destinationType Is GetType(System.String) AndAlso TypeOf value Is ImageChange) Then
            Try
                Dim c As ImageChange = CType(value, ImageChange)
                Return "{" & c.RetainZoom & ", " & c.RetainRotate & "}"
            Catch
                Throw New ArgumentException
            End Try
        End If
        Return MyBase.ConvertTo(context, culture, value, destinationType)
    End Function

    Public Overloads Overrides Function CanConvertFrom(ByVal context As ComponentModel.ITypeDescriptorContext, ByVal sourceType As System.Type) As Boolean
        If (sourceType Is GetType(String)) Then Return True
        Return MyBase.CanConvertFrom(context, sourceType)
    End Function

    Public Overloads Overrides Function ConvertFrom(ByVal context As ComponentModel.ITypeDescriptorContext, ByVal culture As Globalization.CultureInfo, ByVal value As Object) As Object
        If (TypeOf value Is String) Then
            Try
                Dim arr As String() = value.ToString.Replace("{", "").Replace("}", "").Split(",")
                Dim c As New ImageChange With {
                    .RetainZoom = Boolean.Parse(arr(0).Trim),
                    .RetainRotate = Boolean.Parse(arr(1).Trim)
                }
                Return c
            Catch
                Throw New ArgumentException
            End Try
        End If
        Return MyBase.ConvertFrom(context, culture, value)
    End Function
End Class


Thanks in advance.

What I have tried:

One forum said restart the IDE. I already restart even my machine and still have the error.

Still searching on google. I found this answer on a forum..
I copy the answered code and still I have the same error
ExpandableObjectConverter problems[^]
Posted
Updated 10-May-18 22:48pm
v3

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