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Posted

Boa noite, venho lhe pedir uma grande ajuda, estou para criar um novo controle herdando as propriedades do textbox, só que estou tendo um problema em uma linha que esta em vermelho conforme abaixo, pois estou quebrando a cabeça a várias semanas e não consegui a solução para o problema, veja o erro abaixo, o que devo fazer para resolver este problema.

linha 1 - Imports System

linha 2 - Imports System.Windows.Forms

linha 3 - Imports System.Drawing

linha 4 - Imports System.ComponentModel

linha 5 - Public Class newtextbox

linha 6 -  Inherits System.Windows.Forms.TextBox

linha 7 - End Class

Error 1 Base class 'System.Windows.Forms.TextBox' specified for class 'newtextbox' cannot be different from the base class 'System.ComponentModel.UserControl' of one of its other partial types. C:\teste\controle\newtextbox.vb linha 6 coluna 14 controle

Posted

Bom dia

Normalmente crio um extender de uma class.

Mas a herança passa por algo como este exemplo

Imports System

Imports System.Collections.Generic

Imports System.ComponentModel

Imports System.Data

Imports System.Drawing

Imports System.Linq

Imports System.Text

Imports System.Windows.Forms

Public Class Form1

    Inherits Form

    Dim textBox1 As TextBox

    Public Sub New()

        InitializeComponent()

    End Sub

    Private Sub InitializeComponent()

        Me.textBox1 = New System.Windows.Forms.TextBox()

        Me.SuspendLayout()

        '

        ' textBox1

        '

        Me.textBox1.AcceptsReturn = True

        Me.textBox1.AcceptsTab = True

        Me.textBox1.Dock = System.Windows.Forms.DockStyle.Fill

        Me.textBox1.Multiline = True

        Me.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical

        '

        ' Form1

        '

        Me.ClientSize = New System.Drawing.Size(284, 264)

        Me.Controls.Add(Me.textBox1)

        Me.Text = "TextBox Example"

        Me.ResumeLayout(False)

        Me.PerformLayout()

    End Sub

End Class

cumpts

Posted

Boa tarde

O projecto e um ClassLibrary1

Depois tenho varias classes tipo gridview,text box e etc.

Aqui vai um exemplo

da textbox enviar como posso fazer isso?

Imports Microsoft.VisualBasic

Imports System.ComponentModel

Imports System.Windows.Forms

Public Class TextBoxControlDG

    Inherits TextBox

    Sub New()

        Me.BackColor = Color.Yellow

        Me.Font = New Font("Maiandra GD", 9, FontStyle.Italic)

    End Sub

    <DefaultValue(GetType(Color), "Yellow")> _

    Public Overrides Property BackColor() As System.Drawing.Color

        Get

            Return MyBase.BackColor

        End Get

        Set(ByVal value As System.Drawing.Color)

            MyBase.BackColor = value

        End Set

    End Property

    <DefaultValue(GetType(Font), "Maiandra GD, 9pt, style=Italic")> _

    Public Overrides Property Font() As System.Drawing.Font

        Get

            Return MyBase.Font

        End Get

        Set(ByVal value As System.Drawing.Font)

            MyBase.Font = value

        End Set

    End Property

    Protected Overrides Sub OnLeave(ByVal e As System.EventArgs)

        If Not IsNumeric(Me.Text) Then

            MessageBox.Show("You must enter a numeric value!", _

              "Please try again....", MessageBoxButtons.OK, _

              MessageBoxIcon.Exclamation)

            Me.Focus()

        End If

    End Sub

    Protected Overrides Sub OnTextChanged(ByVal e As System.EventArgs)

        If Not File.Exists(Me.Text) Then

            Me.ForeColor = Color.Red

        Else

            Me.ForeColor = Color.Black

        End If

        MyBase.OnTextChanged(e)

    End Sub

    Private Sub txtIntegerValidate(ByVal e As  _

                        System.Windows.Forms.KeyPressEventArgs)

        If (e.KeyChar >= "!" And e.KeyChar <= "/") Or _

                (e.KeyChar >= ":" And e.KeyChar <= "~") Then

            e.Handled = True

        End If

    End Sub

    Protected Overrides Sub OnKeyPress(ByVal e As  _

                  System.Windows.Forms.KeyPressEventArgs)

        Select Case objType

            Case objType.Numeric

                Call txtIntegerValidate(e)

            Case objType.Text

                Call txtStringValidate(e)

            Case objType.Mixed

                Call txtMixedValidate(e)

        End Select

    End Sub

End Class

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