نکات، ایده ها و ترفندهای کوچک برنامه نویسی در vb.net

[ghafoori]

https://barnamenevis.org/showpo...3&postcount=49


ابتدا System.Management رو به References پروژه بیفزایید و سپس :
کد:

Imports System.Management



Private Sub GetMACAddress()



        Dim searcher As ManagementObjectSearcher

        Dim qry As String = "select * FROM Win32_NetworkAdapter"

        searcher = New ManagementObjectSearcher(qry)

        For Each wmi_HD As ManagementObject In searcher.Get()

            If Not wmi_HD("MacAddress") Is Nothing Then

                MessageBox.Show(wmi_HD("MacAddress").ToString())

            End If

        Next

    End Sub

[ghafoori]

https://barnamenevis.org/showpo...0&postcount=50
کد:

' //Open with the 'Windows picture and fax viewer':

        System.Diagnostics.Process.Start("C:\Windows\syste  m32\rundll32.exe ", _

        "C:\Windows\system32\shimgvw.dll,ImageView_Fullscr  een " + "filename")

اینهم که آسونه اما شاید واسه دوستانی مفید باشه :
کد:

 '//Open with the 'Microsoft Paint':

        System.Diagnostics.Process.Start("C:\Windows\syste  m32\MSPaint.exe ", " filename")

[ghafoori]

https://barnamenevis.org/showpo...3&postcount=51

مثال - برای آخرین آیتم :
کد:

        '// Set the TopIndex property of the ListBox to ensure the

        '// most recently added items are visible.

        ListBox1.TopIndex = ListBox1.Items.Count - 1

        ListBox1.SelectedIndex = ListBox1.Items.Count - 1

[ghafoori]

https://barnamenevis.org/showpo...5&postcount=52


کد:

Private dragging As Boolean

    Private pointClicked As Point



    Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown

        If (e.Button = MouseButtons.Left) Then



            '// Turn drag mode on and store the point clicked.

            dragging = True

            pointClicked = New Point(e.X, e.Y)

        Else



            dragging = False

        End If

    End Sub



    Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove

        If dragging Then



            Dim pointMoveTo As Point

            '// Find the current mouse position in screen coordinates.

            pointMoveTo = Me.PointToScreen(New Point(e.X, e.Y))

            '// Compensate for the position the control was clicked.

            pointMoveTo.Offset(-pointClicked.X, -pointClicked.Y)

            '// Move the form.

            Me.Location = pointMoveTo

        End If

    End Sub



    Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp

        dragging = False

    End Sub

[ghafoori]

کد:

ابتدا خاصیت allow drop را true کنید

 Private Sub TextBox1_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TextBox1.MouseDown

        TextBox1.SelectAll()

        TextBox1.DoDragDrop(TextBox1.Text, DragDropEffects.Copy)

    End Sub



    Private Sub TextBox2_DragEnter(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles TextBox2.DragEnter

        If (e.Data.GetDataPresent(DataFormats.Text)) Then

            e.Effect = DragDropEffects.Copy

        Else

            e.Effect = DragDropEffects.None

        End If

    End Sub



    Private Sub TextBox2_DragDrop(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles TextBox2.DragDrop

        TextBox2.Text = CType(e.Data.GetData(DataFormats.Text), String)

    End Sub

[ghafoori]

کد:

https://barnamenevis.org/showpo...8&postcount=54

 Private Function CaptureScreen() As Image



        Dim screen As Bitmap = New Bitmap(Windows.Forms.Screen.PrimaryScreen.Bounds.W  idth, Windows.Forms.Screen.PrimaryScreen.Bounds.Height)

        Dim g As Graphics = Graphics.FromImage(screen)

        Using (g)

            g.CopyFromScreen(0, 0, 0, 0, screen.Size)

        End Using

        Return screen

    End Function

[ghafoori]

کد:
https://barnamenevis.org/showpo...9&postcount=55

'// Play a beep with default frequency

        '// and duration (800 and 200, respectively)

        Console.Beep()



        '/ Play a beep with frequency as 200 and duration as 300

        Console.Beep(200, 300)



        Media.SystemSounds.Asterisk.Play()



        Media.SystemSounds.Hand.Play()



        Media.SystemSounds.Exclamation.Play()



        Media.SystemSounds.Beep.Play()



        Media.SystemSounds.Question.Play()