Databindings Question

29 Mar 2005 4:31 PM

Martin Horn

Hi,

I want to use databinding on a property for a class that I have created, but
I can't make it work. Below is a contrived example to illustrate the
problem.

It seems that I can't databind properties that I have created, is there a
way to do this?

Thanks,

Martin.

Public Class Form1

    Public Class Class1
        Inherits Button
        Public MyValue As String = "Default Value"
    End Class

    Private Sub Form1_Load(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles MyBase.Load
        Dim t As New Class1

        ' This line would work as expected
        ' ----------------------------------
        ' TextBox1.DataBindings.Add("Text", t, "Size")

        ' This line causes runtime error:
        ' Cannot bind to property or column MyValue on DataSource.
        ' Parameter name: dataMember
        ' -------------------------------------------------------------
        TextBox1.DataBindings.Add("Text", t, "MyValue")
    End Sub

End Class

29 Mar 2005 5:17 PM

Kerry Moorman

Martin,

You might try making MyValue a public property instead of a public field.

Kerry Moorman

Show quoteHide quote

"Martin Horn" wrote:

> Hi,
>
> I want to use databinding on a property for a class that I have created, but
> I can't make it work. Below is a contrived example to illustrate the
> problem.
>
> It seems that I can't databind properties that I have created, is there a
> way to do this?
>
> Thanks,
>
> Martin.
>
> Public Class Form1
>
>     Public Class Class1
>         Inherits Button
>         Public MyValue As String = "Default Value"
>     End Class
>
>     Private Sub Form1_Load(ByVal sender As System.Object, _
>     ByVal e As System.EventArgs) Handles MyBase.Load
>         Dim t As New Class1
>
>         ' This line would work as expected
>         ' ----------------------------------
>         ' TextBox1.DataBindings.Add("Text", t, "Size")
>
>         ' This line causes runtime error:
>         ' Cannot bind to property or column MyValue on DataSource.
>         ' Parameter name: dataMember
>         ' -------------------------------------------------------------
>         TextBox1.DataBindings.Add("Text", t, "MyValue")
>     End Sub
>
> End Class
>
>
>

29 Mar 2005 6:06 PM

Martin Horn

Thanks Kerry, that did it.

To be honest I thought I had already tried that, must have got confused
somewhere along the line.

Martin.

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"Kerry Moorman" <KerryMoor***@discussions.microsoft.com> wrote in message
news:3384CA17-EC5C-4402-BAFB-7A91E224F560@microsoft.com...
> Martin,
>
> You might try making MyValue a public property instead of a public field.
>
> Kerry Moorman
>
>
> "Martin Horn" wrote:
>
>> Hi,
>>
>> I want to use databinding on a property for a class that I have created,
>> but
>> I can't make it work. Below is a contrived example to illustrate the
>> problem.
>>
>> It seems that I can't databind properties that I have created, is there a
>> way to do this?
>>
>> Thanks,
>>
>> Martin.
>>
>> Public Class Form1
>>
>>     Public Class Class1
>>         Inherits Button
>>         Public MyValue As String = "Default Value"
>>     End Class
>>
>>     Private Sub Form1_Load(ByVal sender As System.Object, _
>>     ByVal e As System.EventArgs) Handles MyBase.Load
>>         Dim t As New Class1
>>
>>         ' This line would work as expected
>>         ' ----------------------------------
>>         ' TextBox1.DataBindings.Add("Text", t, "Size")
>>
>>         ' This line causes runtime error:
>>         ' Cannot bind to property or column MyValue on DataSource.
>>         ' Parameter name: dataMember
>>         ' -------------------------------------------------------------
>>         TextBox1.DataBindings.Add("Text", t, "MyValue")
>>     End Sub
>>
>> End Class
>>
>>
>>