How To Get DataBindings To Be Two Way When Property Changed
Nov 11, 2010
I'm having trouble using DataBindings in a Windows Form / User Control. For example: Create a windows form, place a single text-box on it & place two buttons on it. The code behind the form is:
Imports System.ComponentModel
Public Class Form1
Implements System.ComponentModel.INotifyPropertyChanged
Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged
[Code] .....
If you type something into the text box & press Button1, you'll get a message box with the text of the property in it. If, however, you press Button2 (which sets the property in code) and then press Button1 again, you'll see that while the property was indeed set in the code, the text box doesn't reflect the change.
Updated the code to provide the implementation of INotifyPropertyChanged. This now works as desired.
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Feb 28, 2011
I have some textboxes bound to a bindingsource and bindingnavigator.
I want to detect when the values have changed and prompt the users to confrim if they want to update.
When the form is first initalised and when then binding navigator moves to the next record the text_changed event fires on textbox where I have a boolean to determine if things have changed.
Is there a way to set my boolean only when valid data changes have occured or a better way to detect if things have changed
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Jan 18, 2010
What are the pros and cons of using the checkboxes checked property vs the CheckState property for databinding?
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Jan 8, 2009
I used to use ADODC with VB6. Once I've set up databindings I can set a text box or other controls to link with a database's specific field by changing the Text property under Data > DataBindings. I want to change the field the text box links to at different times using code. How can I do this?
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Nov 27, 2010
I have a listbox binded to a list of objects. For each list item I wanted to have a rectangle whose fill color is determined by a few properties of the binded object. So I did the following:
Made sure INotifyPropertyChanged was implemented on my object.Created a class to expose the properties I am interested in as attached properties.Binded the properties of the object to the attached properties of the rectangle Created a style that uses triggers to set the rectangle fill based on attached properties.
This works, but only the first time the property of the object changes. After that, the attached properties do not seem to be receiving notification when the data object's property changes. I have double checked and my data object is raising the INotifyPropertyChanged event.
<Rectangle Style="{StaticResource RecordStateRectangleStyle}"
Width="10" Height="10" Stroke="Black"
local:RecordAttachment.RecordState="{Binding Path=RecordState}"
local:RecordAttachment.IsDeleted="{Binding Path=IsDeleted}" />
[code]....
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Feb 18, 2012
Private _pages As New List(Of Panel)
Public ReadOnly Property pages() As List(Of Panel)
Get
[code].....
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Jan 3, 2010
How can I make an event that is raised when a variable or property is changed (or can I just put the code I would put in an event in the Set section of a property?
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Mar 2, 2011
I have a class and one of the properties is a list of a custom class. The caller gets the list and is adding instances of class to the list. How do I get notified that the list has been updated?
Private _list as List(of MyType)
Private _totalField1 as Integer
Public Property MyTypeList As List(Of MyType)
Get
Return _list
End Get
Set(ByVal value As List(Of MyType))
_list= value
_totalField1 = _list.Sum(Function(x) x.Field1)
End Set
End Property
What I'm trying to do is every time a MyType object is added to the list keep a running total of Field1, but adding to the list doesn't use the setter. How can I know when the list has been added or changed?
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Feb 22, 2011
dim oXT As New Generic.SortedDictionary(Of String, MyClass)
[Code]...
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Jun 7, 2012
I know how to handle a single objects property changed event very easily. I want to handle a objects property changed event that is part of another object.
Given Object:
[ObjectY = Y]
+ Public WithEvents X As ObjectX
I would like to do something like:
Private Sub XPropertyChanged() Handles Y.X.PropertyChanged
Right now I need to create a object that equals the object inside that object and then handle this variable pointers property changed, but that is just annoying.
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May 5, 2012
I changed my Username on my computer from i.e. "xxxxxx x xxxxx" to "Dennis"
VB 2008 during a compile gave me the following error: Error reading icon 'C:Usersxxxxxx x xxxxxAppDataRoamingMicrosoftVBExpress9.0VSProjectApplication.ico' -- The system cannot find the path specified.
The file "VSProjectApplication.ico" is in 'C:UsersDennisAppDataRoamingMicrosoftVBExpress9.0'
Somewhere in the VB2008 "configuration" files I believe that I need to manually change the old path to the new path.
I found the old path in the ".suo" file. The ".suo" file is not a text file. How can I edit the .suo file, save it so that it will work?
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Jan 20, 2010
on my Form I have a DataViewGrid and some textboxes with a save button (they are filled with additional data of the selected row).Save is disabled first, when I change something in the textboxes the save button is enabled.When the user changes a gow in the grid, I want to ask before changing the grid row, if he wants to save (if the button is enabled).I am using RowEnter but this is too late, then the selected row already changed (and my textboxes already got new data)...What event can I use to ask if I should save stuff before the user changes a row?Something like BeforeRowChanging with a chance to cancel changing the row?
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Mar 11, 2010
I'm trying to create DataBindings to textbox and combobox controls on my form. Here is my code so far:
Private Sub SetBindingSources(ByVal strClientID As String)
Try
'This section of code populates the grdAddresses DataGridView
strSQL = "SELECT B.addrDesc, A.addr1, A.addr2, A.addr3, A.city, A.stateCD, A.zipCode, A.phone, A.fax "
[code]....
The highlighted line of code is returning the error message (see screenshot below). The part that I'm not sure what to code is the "dt1.addr1".
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Mar 16, 2009
I'm try to making a text box showing a date, this what i've done
[code]...
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Jun 23, 2010
I'm having some problems with a data bound datagridview.My current scenario is the following..The itemSetup has tree properties {ItemNo, CompNo, LocNo}(compno locno are not required)I have a datagridview with a datasource list of itemSetup And this has two comboxes cboCompany that is bound to a list of company the selected value is bound to compno. cboLocation that is bound to a list of locations the selected value is bound to locno the location class requires the compno to create the list of location the problem I run in o is that the when the compno is Nothing the cboCompany throw a datagridview_ dataerror when the form is loaded en when a item is added it looks like the binding of the combox runs later then the value is set.
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Apr 6, 2009
(I used to use VB6.) I have been developing a database management program which is quite simple so far, with navigational controls, ability to delete record, datagrid, etc.
It uses databound textboxes, but when I modify the content of them it does not update the database. Same applies when I add a new record and fill in the textboxes.
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Aug 4, 2009
I want all binded controls in a form or a user control have the Data Source Update Mode to OnPropertyChanged (by default they are in OnValidation).I can do that for each control in designer mode and in the DataBindings, under Advanced, change the Data Source Update Mode to OnPropertyChanged but I want to do that once for all controls.
All my controls are in a big user control, so I put before InitializeComponent() :
Me.DataBindings.DefaultDataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged
It is not good, my controls are still in OnValidation mode (instead I force the
[code].....
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Apr 6, 2009
I have been developing a database management program which is quite simple so far, with navigational controls, ability to delete record, datagrid, etc.
It uses databound textboxes, but when I modify the content of them it does not update the database. Same applies when I add a new record and fill in the textboxes. What do I need to do?
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Feb 22, 2012
I wanna know a thing.I wanna know how to move into the different regs of the form (using databindings), just focusing the ID textbox and selecting ALT + => to go to right, ALT + <= to go to left, ALT + UPbutton to go to next and ALT + DOWNbutton to go behind.
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Jun 2, 2010
I have a form with many different textboxes on it. The form is used to Edit the data already in a databound table. At design time I set my Databindings.text to the appropriate columns.
During form load I check the values in the bound column for null values. If the column value is null, I set the textbox.text property to a descriptive prompt like "enter telephone #" or enter city. I also use databinding.remove to remove the databinding so that the desriptive prompts don't wind up in the database.
Here is the code I use to remove the databinding.
For Each Panels In Me.Controls
PBox = TryCast(Panels, Panel)
[CODE]...
.Tag2Defaultphase is a custom property I have defined which holds the default descriptive prompt. If the user enter a value into the textbox I then wish to add the bind back so that when I updateall with the tableadapter the value will be transferred back to the appropriate bound column.
Here is my code for that:
Sub perOptionalTBoxValidation(ByRef TBControl As custTextBoxControl, ByRef strDefaultTextPhrase As String, ByRef intMaxChars As Int32, ByRef bsBindingSource As BindingSource, ByRef strColumnName As String)
[CODE]...
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Mar 6, 2012
I have several controls in a winform application that I added databindings to using code.
Dim tblWrapper As ObliqueQCAndSpliceTool.TableWrapper = New ObliqueQCAndSpliceTool.TableWrapper(tbl, idField.Name)
tblWrapper.UseCVDomains = True
[code].....
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Dec 10, 2011
I am doing a project for a course that involves a database, i have it set up already so that i can have two different labels displaying data from two different fields in a table when the form loads, but i am trying to get it so that when i click an option in a listbox it will change the displayed information. I am using the following code to set it when the form loads:[code]
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Sep 24, 2010
I am sharing databinding when opening a detail form a summary form. The data is shared fine. What I don't know is how to save any data that may have changed, or to create a new record.[code]...
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Jan 16, 2009
I am porting a college project made in VB6 to VB.NET, which I am quite new to. I'm finding data bindings a little more frustrating than the ADO controls VB6 had. Here is an example of RecordCount being used in the old code, from the login screen:
Private Sub cmdLogon_Click()
If txtID.Text = "" And txtPassword.Text = "" Then
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Mar 1, 2011
I am trying to add to a binding using Control.DataBindings.Add(). The issue that I am having is that the data member name has a period and space in it("Foo. Bar"). When I try to add the binding I pass in the string "Foo. Bar" as one of the arguments and I get an exception "CAnnot find datamember "Foo.".Is there a syntax that I need to use to pass the datamember name in when it has a period in it? I tried adding "[]" around the name but no dice.
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Aug 27, 2009
I can't seem to figure out how to use databindings to enable/disable a button when a listbox contains 0/1+ items?
Button1.DataBindings.Add("Enabled", ListBox1, "Items.Count")
Button1.DataBindings.Add("Enabled", ListBox1.Items, "Count")
Result = ArgumentException: Cannot bind to the property or column Count on the DataSource. Parameter name: dataMember
Button1.DataBindings.Add("Enabled", TextBox1, "Text.Length") ' This works?
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Jun 29, 2010
I have a form that has several controls, most of them are textboxs. All controls are binded to a bindingsource. The controls that always have values, they are displayed correctly, but the others ones that have null values in the data source, the default null value doesn't show up. This problem it's driving me crazy... There must be something that i'm missing. Some of the code that i had used with no luck:
[Code]...
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Feb 19, 2010
can i use an inverse notation in the databindings to enabled or disabled one checkbox?I have a form that has several controls binded, and if i have true in one field in the database i need to check checkbox and disabled it.Something like:
vb.net
chk.DataBindings.Add("checked", bs, "MyDBFieldBool")
chk.DataBindings.Add("enabled", bs, "MyDBFieldBool")
This can be done directly?
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Dec 9, 2011
I'm having some very weird issues with interfaces right now.
I have a very simple setup. In one of my class, I have a Property implementing a Property from an Interface.
In my class it's like:
Private _oForm As IForm
Public Property Form As IForm Implements IContainer.Form
Set(value As IForm)
[Code]...
I have like dozens of interfaces like this working throughout my project and I can't believe this simple one can't work!
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Jun 10, 2011
Is there a way for implementers of an interface where a ReadOnly property is defined to make it a complete Read/Write Property ?
Imagine I define an interface to provide a ReadOnly Property (i.e., just a getter for a given value) :
Interface SomeInterface
'the interface only say that implementers must provide a value for reading
ReadOnly Property PublicProperty As String
End Interface
This means implementers must commit to providing a value. But I would like a given implementer to also allow setting that value. In my head, this would mean providing the Property's setter as part of the implementation, doing something like this :
Public Property PublicProperty As String Implements SomeInterface.PublicProperty
Get
Return _myProperty
[code]....
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