Changing default value of a property of a control (DataGridView).

priyamtheone

I am inheriting my own datagridview (say MyDataGridView) from the standard datagridview control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows, AllowUserToDeleteRows, AllowUserToResizeRows properties should have the default values of False; so that when I drag MyDataGridView into a form in the IDE, the default values shown in the properties grid should be False. Later on, if I want to change them to True from the grid, they will be set accordingly. Is it possible somehow? Please note that I don't want to set the default value of any custom property in MyDataGridView but the properties mentioned above that are derived from the base. Thanks. VS.Net, Framework 4.0, VB.Net, C#.Net, WinForms

Simon_Whale

Have a try of this

Public Class Class1
Inherits DataGridView

Private \_AllowUserToAddRows As Boolean = False

Public Shadows Property allowUserToAddRows() As Boolean
    Get
        Return \_AllowUserToAddRows
    End Get
    Set(ByVal value As Boolean)
        If \_AllowUserToAddRows <> value Then
            \_AllowUserToAddRows = value
            MyBase.AllowUserToAddRows = value
        End If
    End Set
End Property

End Class

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Wayne Gaylard

You just need to set the relevant properties in the constructor of you custom control like this:-

Public Class MyDataGridView
Inherits DataGridView

Public Sub New()
    InitializeComponent()
    AllowUserToAddRows = False
    AllowUserToDeleteRows = False
End Sub

End Class

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priyamtheone

I tried the following way as well as yours on the Visible property of an inherited label but yet it stays True in the properties grid when compiled and dragged in the IDE. I need to change it manually to take effect.

Imports System.ComponentModel

Public Class MyLabel
Inherits Label

Public Sub New()
    MyBase.New()

    'This call is required by the Component Designer.
    InitializeComponent()
End Sub

 \_
Public Shadows Property Visible As Boolean
    Get
        Return MyBase.Visible
    End Get
    Set(ByVal value As Boolean)
        MyBase.Visible = value
    End Set
End Property

End Class

Another point is, I tried both ways on the AutoSize property too, with the default value of False. In that case though, in the properties grid, it was showing False but actually the property remains True, as that's what I can see while executing. In order to set the value to False, I need to set it to True and then back to False again. :sigh: