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"it failed" is not what I want as a result message, as it provides no clue on what caused the failure, hence the user does not know what to do next.
FWIW (Google it!): Simplifying published code you're not happy about often isn't the best way to get things solved.
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Purpose is to Invoke The Parent from a class.
From 'User Control' Parent/Paren form can be accessed.
'Me.Parent 'OR
'Me.ParentForm
'Me.Parent.Invoke(......)
But I want to do above from a class.
I did using following code:
Private Parent As System.Windows.Forms.Control
Public Sub New (ByVal Parent As System.Windows.Forms.Control)
'Any way to access Parent Form From a class without passing Parent as Argument?'<br>Me.Parent = Parent
End Sub
Is there any alternative without passing Parent Form as Argument to Invoke Parent's Thread?
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Hi,
each WinForms Control has a Parent property. It gets set when the Control is added to its parent's Controls collection, which cannot happen until after its constructor finishes. Hence, no you can't predict its future parent inside its constructor, but you will get it for free later on.
If the Controls get added in Visual Designer, their parent will have been set at the time your Form loads (use the Form.Load event). If you don't know when the parent is going to be set (e.g. because all things happen dynamically), then you could use the Control.ParentChanged event to your advantage.
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Plz read the following Example. You are right only for ctrl1 Class. But my Question was about Class1.
Is there any way to access Parent from Class1?
'Form1
Public Class Form1
Inherits Form
End Class
'Class1
Public Class Class1
'here I want to access form1. not using frm1.member and not usinig dim ff as new form1, ff.member
'I just want to access that form using me.parent
Sub ParentAccess()
Me.Parent.Text = "It's a compile time Error"
'Error:- Parent is not a member of Class1
End Sub
End Class
'User Control1
Public Class ctrl1
Inherits ComboBox
Sub ParentAccess()
Me.Parent.Text = "Very easy to access but my class1 don't have the statment like Inherits ComboBox"
'No Error:
End Sub
End Class
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You can if you set a reference to the form in Class1 but that is a very bad design, unless Class1 is strictly meant as a helper class for that form. Class1 is not an inherited Control class like ctrl1, so it doesn't have Parent property. You will have to define the Control type property and set the property accordingly.
Beside you won't be able to access to the combobox of the form unless you set it to public, which is another bad design.
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How to get name in FlowLayoutPanel child control when I click him. Control is PictureBox
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In the click handler for the control, you can use:
Dim c As Control = DirectCast(sender, Control)
Dim cName As String = c.Name
But, you're not providing enough detail about what you're clicking on or other details that I fear you may be leaving out.
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I give picture from scaner
Dim img As New PictureBox
......
wiaItem = DirectCast(Marshal.CreateWrapperOfType(wiaObj, GetType(ItemClass)), ItemClass)
imageFilename = Path.GetTempFileName()
....
img.Image = Image.FromFile(imageFilename)
FlowLayoutPanel1.Controls.Add(img)
Dim i As Integer
i = FlowLayoutPanel1.Controls.Count
FlowLayoutPanel1.Controls.Item(i - 1).Name = "snimka" & i
and I want to give picture control name when click over him
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Most often when people ask for a Control's name, they are doing something very wrong. Event handlers get a sender parameter that is much better than a name.
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Hi, I need help displaying a list of items in a combo box. My problem is this, I want to display a name "Drive Time" and when it is selected i want to use the value of the variable "002302" it is like:
Drive Time = 002302
I want to display "Drive Time" and I want to use the value "002302" when it is selected in the combobox. I hope this made sense. I appreciate the help.
Thanks
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It would be best if you created a structure to hold both items as a single datatype, and then you create a List(Of item) and bind the ComboBox to the List(Of T). Then in your ComboBox.SelectedIndexChanged you can reset the textbox Like this
Public Class Form1
Private Structure Items
Private strName As String
Private intID As Integer
Public Property Name() As String
Get
Return strName
End Get
Set(ByVal value As String)
strName = value
End Set
End Property
Public Property ID() As Integer
Get
Return intID
End Get
Set(ByVal value As Integer)
intID = value
End Set
End Property
End Structure
Private lstItems As List(Of Items)
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
lstItems = New List(Of Items)
For i As Integer = 0 To 5
Dim newItem As New Items
newItem.Name = "Item " & i.ToString
newItem.ID = i
lstItems.Add(newItem)
Next
ComboBox1.DataSource = lstItems
ComboBox1.DisplayMember = "Name"
ComboBox1.ValueMember = "ID"
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
TextBox1.Text = CType(ComboBox1.SelectedItem, Items).Name
End Sub
End Class
Hope this helps
Happy Coding
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Yes, makes sense.
Why don't you use an ArrayList in conjuction with your ComboBox
and make the indexes correspond to one another?
E.g.
ComboBox1.Items.Add("Drive Time")
ComboBox1.Items.Add("......")
...
Array1.Add("002302")
Array1.Add("......")
...
Public Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
value = Array1.Item(ComboBox1.SelectedIndex).ToString
End Sub
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Thank you! that makes so much sense.
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That is horrible. It was OK in the eighties perhaps, now things get to be handled in an object-oriented way, so turn those things into objects, show one of their properties and use another property.
BTW: that is exactly what ComboBox.DisplayMember and ValueMember properties are for.
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Simia est simia et si aurea gestet insignia.
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I hate to admit it but I just recently learned this. I believe what you are trying to do is display one value and use another that is associated with it for something else.
The easiest way I have seen this done is to use the DisplayMember and the ValueMember properties of the combo box like I said I just figured this out and it has made my life so much easier than the old way we handled it. So in your case you would use.
cboMyCombo.DisplayMember = "Drive Time"
cboMyCombo.ValueMember = "002302"
Msgbox(cboMyCombo.ValueMember.ToString())
I did not compile that code it may or may not work but you get the general idea.
Humble Programmer
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Alas, this won't work, since .DisplayMember and .ValueMember
are string based which refer to a corresponding (table)column name
of the bonded data.
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I think the best solution for this is using an enum
private enum combo_values
Drive_Time = 002302
.....
.....
end enum
this is the code for diclareing an enum. Unfortunataly ths would mean that you would have to use an underscore instead of a space. But I guess the user would not mind. So, once the enum is diclared, you can enter the following code when an item is selected:
myValue=ctype(combo1.text,enum)
if you want make 'combo_values' a variable of your type, you can do it by typing something like,' private enum combo_values as integer'.
and do inform me if it does not work.
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Hello To All,
I want to fill the color in outer area of Arc.
Thanks
If you can think then I Can.
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You have permission.
You're welcome
--edit
My apologies for the answer; if you have a point, a coordinate within the surface that you want to color, then you could use the floodfill[^]-algorithm.
I are Troll 
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Can u please explain me what r u trying to say.
If you can think then I Can.
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Two things;
- The first post didn't contain a question, but a statement. If you need help, then at least write down what you need help with. Otherwise, I'll just point to rent-a-coder or something similar.
- The Floodfill algorithm (previous post contained a link with source) is used to color area's. If you know the coordinates of your arc, then you can use one of those coordinates to either color the arc itself, or the area outside the arc.
Good luck
I are Troll
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Hi
how do i make sql statement to page the rows six per result
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Wrong forum. Try the 'General Database' forum.
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