Wondering how to place combobox control as last sub item for each row with some data coming from datasource. Have this code below:
LvSelMat.BeginUpdate()
Dim rodzajID as String = TreeMaterials.SelectedValue
Dim rodzajName as string = TreeMaterials.SelectedNode.Text
Dim parent as string = TreeMaterials.SelectedNode.Parent.Text
Dim li as ListViewItem
li = LvSelMat.Items.Add(parent)
li.SubItems.Add(rodzajName)
li.SubItems.Add(rodzajID)
'Here want to add combobox...
so far i tried like this but its only showing up combobox without any other items in row...
Dim combo as new combobox
combo.DataSource = New Variation().GetAll
combo.DisplayMember = "Name"
combo.ValueMember = "Id"
combo.dropdownstyle = ComboBoxStyle.DropDownList
' combo.height = item.bounds.height
' combo.location = new point(item.bounds.right, item.bounds.y)
LvSelMat.controls.add(combo)
Related
This is one of the form, all the usercontrol value in this form will store in My.Settings
I have another form with a FlowLayoutPanel, everytime when the application start,
if Active checked then it will add a Button with discount value to the FlowLayoutPanel.
Should I add those usercontrol to a list and then loop through the list? Or what is the best way to solve this kind of problem?
UPDATED
How can I add multiple item to list in 1 code? I getting this error when system run to line 5
An exception of type 'System.NullReferenceException' occurred in XXX.exe but was not handled in user code
Additional information: Object reference not set to an instance of an object.
Public Sub RefreshDiscount(ByRef ref As scr_mainDiscount)
Dim li_disName As New List(Of TextBox)
Dim li_disValue As New List(Of TextBox)
Dim li_disType As New List(Of ComboBox)
Dim li_active As New List(Of CheckBox)
Dim tb_disName As TextBox() = {ref.tb_name1, ref.tb_name2, ref.tb_name3, ref.tb_name4, ref.tb_name5, ref.tb_name6, ref.tb_name7, ref.tb_name8, ref.tb_name9, ref.tb_name10}
Dim tb_disValue As TextBox() = {ref.tb_value1, ref.tb_value2, ref.tb_value3, ref.tb_value4, ref.tb_value5, ref.tb_value6, ref.tb_value7, ref.tb_value8, ref.tb_value9, ref.tb_value10}
Dim cb_disType As ComboBox() = {ref.cb_type1, ref.cb_type2, ref.cb_type3, ref.cb_type4, ref.cb_type5, ref.cb_type6, ref.cb_type7, ref.cb_type8, ref.cb_type9, ref.cb_type10}
Dim chkb_active As CheckBox() = {ref.CheckBox1, ref.CheckBox2, ref.CheckBox3, ref.CheckBox4, ref.CheckBox5, ref.CheckBox6, ref.CheckBox7, ref.CheckBox8, ref.CheckBox9, ref.CheckBox10}
li_disName.AddRange(tb_disName)
li_disValue.AddRange(tb_disValue)
li_disType.AddRange(cb_disType)
li_active.AddRange(chkb_active)
For index As Integer = 0 To li_active.Count - 1
If li_active(index).Checked = False Then
li_disName.RemoveAt(index)
li_disValue.RemoveAt(index)
li_disType.RemoveAt(index)
li_active.RemoveAt(index)
Else
Dim btn As New ctrl_DiscountButton
With btn
.Text = li_disName(index).Text
.Price = li_disValue(index).Text
.Type = li_disType(index).Text
End With
scr_sales.flp_discount.Controls.Add(btn)
End If
Next
li_disName.Clear()
li_disValue.Clear()
li_disType.Clear()
li_active.Clear()
End Sub
Here's a simple example showing how to find CheckBox1 thru CheckBox10, "by name", using the "searchAllChildren" option of Controls.Find():
For i As Integer = 1 To 10
Dim ctlName As String = "CheckBox" & i
Dim matches() As Control = Me.Controls.Find(ctlName, True)
If matches.Length > 0 AndAlso TypeOf matches(0) Is CheckBox Then
Dim cb As CheckBox = DirectCast(matches(0), CheckBox)
' do something with "cb"
If cb.Checked Then
' ... code ...
' possibly use code just like this to find the matching discount value control?
End If
End If
Next
I'm looking for some help with an issue I am having.
I have multiple text files, in a folder. The folder can have an "unlimited" amount of text files in it, although typically 2-150 files
http://gyazo.com/5f314d1ca374abf9f813914609dd931d (images for this + below, can't embed due to lack of reputation)
Each file then contains an "unlimited" (although typically 0-20 lines) amount of data inside it. Line 1 being the "test number" and line 2 being the "test result" - as seen in the image above
My Data Grid View has 3 columns in it (Username, test number, test result) - as seen in the image above
When running my code below; first record being added to the Data Grid View works perfectly, but the second (or any record after the first) the error occurs:
http://gyazo.com/0d492b97d918853e62c55ee314f3f181 (image) or error message:
"System.InvalidOperationException: Collection already belongs to a
DataGridView control. This operation is no longer valid. at
System.Windows.Forms.DataGridViewCellCollection.Add(DataGridViewCelldataGridViewCell)
at SpellingBee.TeacherMultiResults.TeacherMultiResults_Load(Object
sender, EventArgs e)"
This error occurs on the DGVRow.Cells.Add(DGVCell) 'add cell to row
One thing I don't want to do is change any of my text file/ folder structures, even though I'm aware that it is currently inefficient storage.
How can I fix this error? I'm using VB.net (Visual Studios 2013)
If you need any more information, please just ask
Many thanks.
Imports System.Windows.Forms
Imports System.IO
Public Class TeacherMultiResults
Dim AmountOfFiles
Dim LineCount As Integer = 0
Dim FileName As IO.FileInfo
Dim DGVRow As New DataGridViewRow
Dim DGVCell As DataGridViewCell
Dim Username As String = ""
Dim TestNumber As Integer = 0
Dim TestResult As Integer = 0
Private Sub TeacherMultiResults_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim directory As New IO.DirectoryInfo(LoadForm.CurrentDirectory & "\UserResults\") 'selects directory
Dim FileNames As IO.FileInfo() = directory.GetFiles()
Dim Files As IO.FileInfo
For Each Files In FileNames 'list the names of all files in the specified directory
Username = Files.ToString
Username = (Username.Substring(0, Username.Length - 4)) 'removes the .txt from the name
Try
LineCount = File.ReadAllLines(LoadForm.CurrentDirectory & "\UserResults\" & Username & ".txt").Length 'amount of lines in file
If LineCount > 1 Then
Dim Information As New System.IO.StreamReader(LoadForm.CurrentDirectory & "\UserResults\" & Username & ".txt") 'opens file
LineCount = LineCount / 2 'halfs line count
For i = 0 To LineCount - 1
TestNumber = Information.ReadLine() 'reads line to variable
TestResult = Information.ReadLine() 'reads line to variable
i = i + 1 'adds one to i
DGVCell = New DataGridViewTextBoxCell 'create a new DGV text box cell
DGVCell.Value = Username 'add value to DGV text box cell
DGVRow.Cells.Add(DGVCell) 'add cell to row
DGVCell = New DataGridViewTextBoxCell 'create a new DGV text box cell
DGVCell.Value = TestNumber 'add value to DGV text box cell
DGVRow.Cells.Add(DGVCell) 'add cell to row
DGVCell = New DataGridViewTextBoxCell 'create a new DGV text box cell
DGVCell.Value = TestResult 'add value to DGV text box cell
DGVRow.Cells.Add(DGVCell) 'add cell to row
DGV_MultiResults.Rows.Add(DGVRow) 'add row to DGV
Next
Information.Close() 'Close read
End If
Catch ex As Exception 'if file won't read
MsgBox(ex.ToString) 'show error
Exit Try
End Try 'end of try
Next 'end of files
End Sub
I hope that somebody can help me with this issue, I understand it's fairly simple to fix most probably although I can't seem to find a solution to the error!
Many thanks, Toby.
When working with a DataGridView, it is generally easier to just build an object list and then bind it to the DGV using the built-in data binding features.
For your example, it would look like this:
' Read the files, build objects as you go and add them to a list
Dim lst = New List(Of TeacherMultiResults)
' Replace this part with your file reading code...
Dim t1 = New TeacherMultiResults With {.Username = "Bob", .TestNumber = 1, .TestResult = 75}
lst.Add(t1)
Dim t2 = New TeacherMultiResults With {.Username = "Rick", .TestNumber = 1, .TestResult = 85}
lst.Add(t2)
Dim t3 = New TeacherMultiResults With {.Username = "Zoe", .TestNumber = 1, .TestResult = 95}
lst.Add(t3)
' Bind the list to the DataGridView
Dim bindList = New BindingList(Of TeacherMultiResults)(lst)
Dim bindSrc = New BindingSource
bindSrc.DataSource = bindList
grid.DataSource = bindSrc
Your grid should display each item of your list.
How can I save values in child popup DataGridView?
I am having parent datagridview and child DataGridView in vb.net
Consider I have 2 columns and 2 rows.
When I click 1st column, I will get child DataGridView just near to this cell. Child DataGridView also has 2 rows and 2 columns where I can enter values.
When I click 2nd column, I'll get another new child DataGridView near this cell.
Now if I move back to first column, values I entered are lost. How can I save entered values in popup child window?
Here is my code:
sub cell_click Dim _pointCell As Point = Me.DgV.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, True).Location Dim _pointGrid As Point = DgV.Location Dim _pointLocation As Point _pointLocation.X = _pointCell.X 'width _pointLocation.Y = _pointCell.Y 'height SelectionInGrid() mPopup.Show(DgV.PointToScreen(New Point(_pointLocation.X, _pointLocation.Y))) end sub
Public SelectionInGrid() Dim t1,t2 As New DataGridViewTextBoxColumn() Dim gv As New DataGridView
gv.Columns.Add(t1)
gv.Columns.Add(t2)
gv.Columns(0).HeaderText = "Employee"
gv.Columns(1).HeaderText = "Currency"
gv.Width = t1.Width + t2.Width
Dim mControlHost As ToolStripControlHost = New ToolStripControlHost(gv)
mControlHost.Padding = Padding.Empty
mControlHost.AutoSize = False
mPopup = New ToolStripDropDown()
mPopup.Padding = Padding.Empty
mPopup.Items.Add(mControlHost)
End
sub cell_click
Dim _pointCell As Point = Me.DgV.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, True).Location
Dim _pointGrid As Point = DgV.Location
Dim _pointLocation As Point
_pointLocation.X = _pointCell.X 'width
_pointLocation.Y = _pointCell.Y 'height
SelectionInGrid()
mPopup.Show(DgV.PointToScreen(New Point(_pointLocation.X, _pointLocation.Y)))
end sub
Public SelectionInGrid()
Dim t1,t2 As New DataGridViewTextBoxColumn()
Dim gv As New DataGridView
gv.Columns.Add(t1)
gv.Columns.Add(t2)
gv.Columns(0).HeaderText = "Employee"
gv.Columns(1).HeaderText = "Currency"
gv.Width = t1.Width + t2.Width
Dim mControlHost As ToolStripControlHost = New ToolStripControlHost(gv)
mControlHost.Padding = Padding.Empty
mControlHost.AutoSize = False
mPopup = New ToolStripDropDown()
mPopup.Padding = Padding.Empty
mPopup.Items.Add(mControlHost)
End
The problem lies in the SelectionInGrid Sub which is called every single time you click a cell. In this function you have these lines:
Dim gv As New DataGridView
Dim mControlHost As ToolStripControlHost = New ToolStripControlHost(gv)
mPopup = New ToolStripDropDown()
This means that everytime cell_click runs a new DataGridView, a new ToolStripControlHost and a new ToolStripDropDown are created. To solve this you need to keep track of the different ToolStripDropDowns. For example using a dictionary:
Private PopUps As New Dictionary(Of String, ToolStripDropDown)
sub cell_click
Dim _pointCell As Point = Me.DgV.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, True).Location
Dim _pointGrid As Point = DgV.Location
Dim _pointLocation As Point
_pointLocation.X = _pointCell.X 'width
_pointLocation.Y = _pointCell.Y 'height
If PopUps.ContainsKey(<Parent Selected cell identifyer>) Then
mPopup = PopUps(<Parent Selected cell identifyer>)
Else
SelectionInGrid()
PopUps.Add(<Parent Selected cell identifyer>,mPopup)
End If
mPopup.Show(DgV.PointToScreen(New Point(_pointLocation.X, _pointLocation.Y)))
end sub
I do believe this should work. "Parent Selected cell identifyer" must be something unique from the Parent DGV row/cell that was clicked.
I run the following code in the constructor of a window. The "label" gets added but none of the other controls are shown on screen. If I debug the newTab.Controls there are several controls in it. Why don't they show up on the screen and I only see the "label" control.
Thanks
Dim graphlist As ArrayList = New ArrayList
For Each funct As TL_FUNCTION In functionlist
If (funct.functionname = functi) Then
If Not (graphlist.Contains(funct.picture)) Then
graphlist.Add(funct.picture)
End If
End If
Next
For Each picture In graphlist
Dim NewTab As New TabPage
NewTab.Name = picture
NewTab.Text = NewTab.Name
Me.TabControl1.Controls.Add(NewTab)
Me.TabControl1.SelectedIndex = Me.TabControl1.TabCount - 1
For Each func As TL_FUNCTION In functionlist
If (func.picture = picture) Then
Dim label As Label = New Label
label.Text = func.curve.ToString
NewTab.Controls.Add(label) 'This label shows up
Dim key As String
Dim values() As String
For Each key In func.values.Keys
values = func.values.GetValues(key)
For Each value As String In values
Dim label2 As New Label
label2.Text = key.ToString
Dim textb As TextBox = New TextBox
textb.Text = value
NewTab.Controls.Add(label2) 'this one is not shown on the tab
NewTab.Controls.Add(textb) 'this one is not shown on the tab
Next value
Next key
End If
Next
Next
You are placing the new labels and textboxes underneath the new label that you see in the TabPage because you never set their location, so it defaults to point (0, 0).
Try setting the location for the controls:
For Each value As String In values
Dim label2 As New Label
label2.Text = key.ToString
label2.Location = New Point(10, NewTab.Controls.Count * 24)
Dim textb As TextBox = New TextBox
textb.Text = value
textb.Location = New Point(label2.Right + 4, label2.Top)
NewTab.Controls.Add(label2)
NewTab.Controls.Add(textb)
Next value
Dim cListItems As New System.Collections.Generic.List(Of Combobox_values)
If ds.Tables("items_prices").Rows(0).Item("item_selldozen") > 0 Then
Dim item_selldozen As String = ds.Tables("items_prices").Rows(0).Item("item_selldozen")
cListItems.Add(New Combobox_values("Dozen", item_selldozen))
End If
Dim dgvcbc As DataGridViewComboBoxCell = DirectCast(CType(main.ActiveMdiChild, discount_new_discount).discountitems_new_discount.Rows(last_row).Cells(3), DataGridViewComboBoxCell)
dgvcbc.DataSource = cListItems 'Fill cListItems
dgvcbc.DisplayMember = "Text"
dgvcbc.ValueMember = "Value"
All i need to do is add a Handler for combobox to select the first of the values filled.
Anybody have ideas?
Just set the value using the first item from the source.
dgvcbc.Value = cListItems(0)