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vb.net select line in richtextbox

iscontact
iscontact asked
on
Medium Priority
2,268 Views
Last Modified: 2008-01-09
I need to be able to select all of the text in a richtextbox on the line that the user doubleclicks.  However, thus far I have been unable to determine exactly how to do this.

I have experimented with the following code:

        Dim start As Integer = txtNotes.SelectionStart
        Dim len As Integer = txtNotes.SelectionLength

        txtNotes.Select(start, len)

This is only selecting the word that the user clicks on, and not the entire line as is needed.

For reference, I am working in vb.net 2005.
Comment
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dim selectlinenumber as integer=2
dim lines() as string=split(txtnotes.text,vbcrlf)
txtNotes.SelectionStart=getselectionstart(lines,selectlinenumber)
txtNotes.SelectionLength=lines(selectlinenumber-1).length

function getselectionstart(lines() as string,linenumber as integer) as integer
dim total as integer=0
for i as integer=0 to linenumber-1
total+=lines(i).length
next
return total
end function

Author

Commented:
Here is what I have based on your suggestion:

   Private Sub txtNotes_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtNotes.DoubleClick
        Dim selectlinenumber As Integer = 2
        Dim lines() As String = Split(txtNotes.Text, vbCrLf)
        txtNotes.SelectionStart = getselectionstart(lines, selectlinenumber)
        txtNotes.SelectionLength = lines(selectlinenumber - 1).Length
    End Sub

    Function getselectionstart(ByVal lines() As String, ByVal linenumber As Integer) As Integer
        Dim total As Integer = 0
        For i As Integer = 0 To linenumber - 1
            total += lines(i).length
        Next
        Return total
    End Function

However, I receive an error stating that the index (i) in the function is outside the bounds of the array.

Author

Commented:
I have noticed, upon experimentation, that the problem seems to be data related with regards to this method.  The issue is that there is indeed a line break between the items in the database (which is SQL server).  However, the data was actually entered in the database by a VB6 program so I do not know what line break character to look for in the data.
High School Computer Science, Computer Applications, Digital Design, and Mathematics Teacher
CERTIFIED EXPERT
Top Expert 2009
Commented:
Try this out...

Public Class TestForm

    Private myRtbHandler As RtbHandler

    Private Sub TestForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        myRtbHandler = New RtbHandler(Me.txtNotes)
    End Sub

    Private Class RtbHandler
        Inherits NativeWindow

        Private RTB As RichTextBox
        Private Const WM_LBUTTONDBLCLK As Integer = &H203

        Public Event RtbDoubleClicked(ByVal RTB As RichTextBox)

        Public Sub New(ByVal RTB As RichTextBox)
            If Not (RTB Is Nothing) Then
                Me.RTB = RTB
                Me.AssignHandle(RTB.Handle)
            End If
        End Sub

        Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
            Select Case m.Msg
                Case WM_LBUTTONDBLCLK
                    RTB.Focus()
                    RTB.SelectionLength = 0
                    RTB.SelectionStart = RTB.GetCharIndexFromPosition(RTB.PointToClient(Cursor.Position))
                    Application.DoEvents()
                    SendKeys.Send("{Home}")
                    Application.DoEvents()
                    SendKeys.Send("+{End}")
                    Exit Sub

            End Select

            MyBase.WndProc(m)
        End Sub

    End Class

End Class

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Author

Commented:
Excellent suggestion Idle.  I have one more items in relation to this that needs to be addressed, however.  Once the line has been selected, how do I retrieve the value of the text selected?

Author

Commented:
With Idle's example, I have been able to answer my last question, I just needed to work through it a little closer.  Thanks for the help.
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