Bind A Runtime Object To Control?
Aug 12, 2010
I am developing a fairly large database in VB 2010 as a record keeping. There are 37 tables with some many-to-many relationships in there and some collections too but it all gets loaded into a List of Person object.It is a record keeping database for a youth charity including Personal data, lists of events attended, Medical data, Duke of Edinburgh (UK award scheme) etc The main form is a tabbed form with the linked data from other tables and collection on various tabs
Is it possible to bind a runtime object to a control? if it is possible my life becomes very simple.I can get basic data working with DataSet binding and navigation but the ralationships may prove too fiddly to link as datasets.
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Feb 8, 2011
What I want to achieve is to Bind just some of the properties of a Control to a DataTable object.Let's say I have a Label on the Form : "MyLabel1".MyLabel is a Class that inherits from Label and adds a property "ID", an Integer, to the base class.
I want to Bind .Left and .Top properties of MyLabel1 to a DataRow in my DataTable, and I want to see them updating, everytime I change MyLabel1 location on Form. I put description and full code, so everyone can test it in minutes :
I have :
--> A Form, with a DataGridView "DGV" : The DGV is for showing at real time the desired properties of the controls I want to bind ( in this case, just one control : MyLabel1 ).
--> MyLabel Class :
Public Class MyLabel
Inherits Label
Private m_id As Integer
[code]....
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Jan 5, 2012
creating a user control object in runtime using createobject function or whatever better function in vb.net.
here is my code:
Dim b As New Security.Sec_Role
b.Name = "Sec_Role"
b.visible = true
[Code]....
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Jun 6, 2012
Is there a way to bind the text property of a control to an expression? I have a user control that I add to a FlowLayoutPanel. You can see I have 4 controls in the FlowLayoutPanel below. The first control is a LinkLabel and the other three are my user controls which are numbered 1, 2, & 3. I'd like to bind the label that shows the 1, 2, or 3 to the user controls index within the FlowLayoutPanel.
If I happen to remove the 2nd user control I want the 3rd user control to now display 2. I could use the FlowLayoutPanel ControlAdded or ControlRemoved events, but wanted to see if I could do some binding first.
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Dec 30, 2011
If I need access to the value of a user control's property BEFORE PreRender, would I need to base the custom control off of one of the preexisting data controls (repeater, listview,etc.)?One of my user controls features a gridview control that is configured based on the user control's properties on which it resides. Several of the key properties alter the SQL Statement for the underlying recordsource. I'm now in a situation where the property that sets the WHERE statement for the SQL Statement needs to tied to a value in the user control's parent FormView. Think of the formview as displaying a customer detail record. The user control takes the customer's account number and then displays data from a related table such as Customer Contact Names. Since the gridview is created before the control's prerender event, working within the prerender event doesn't seem efficient.
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Dec 20, 2010
I have created multiple dropdown list at runtime and populated with data. I also have added an eventhandler to determine the selected value of the drop down list.
The code is as follows :
Dim tbl As New Table()
tbl.EnableViewState = "true"
[code].....
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Apr 1, 2011
If I have the following ASP.NET code (it's not complete - obviously there's a lot missing, but none of it matters):
<asp:GridView>
<Columns>
<asp:TemplateField>
<ItemTemplate>
[code]....
How can I bind the GridView so that one row is equivalent to one item in my MyListOfObjects list, and so that the data will populate and persist across page loads or postbacks? I've never done custom databinding like this before, so a full explanation would be very helpful. All the tutorials I've come across so far only talk about using GridViews directly with Database query results, and that's not what I need.
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Sep 12, 2008
I would like to know if its possible to bind the property LOCATION of an object like button.[code]So that, every time I move either the hscrollbar1 or vscrollbar1 the button1.location will change or moves the object to the location of hscrollbar1.value and vscrollbar1.value. It should happen without setting its value using the SCROLL EVENT.
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Aug 30, 2011
This is my first post here so forgive me if I am not following any correct protocols. I am attempting to generate a DataSet and bind it to a datarepeater object. I had been doing this at Design Time and was getting an error message when filling the dataset when the form loaded. So I am basically createing the dataset in my code now when the form loads and binding it to the datarepeater. However, when I attempt to bind the dataset I get a NullReferenceException - even through I know that there are 60 rows of data in the dataset table.
[Code]...
As you can see i have several debug messages in there. I get the error on the last line when setting the datarepeater data source. I try and get data for a specified lot - if it doesn't return any values I create some values in the datatable and add them to the DB. On first load when there is no data this works perfectly. If I then close the form and reload it, it will display fine. However, if I change any of the data (database is updated) and then go back in again, I get the error above.
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Aug 13, 2010
There are issue with using WebBrowser late bind calls related to object/property names generation.For example:
WebBrowser1.Document.DomDocument.Forms.Myform.mycontrol.Value = "test"
will fail with more than one instance of the WebBrowser control.what actually happen is that mycontrol object become Mycontrol and compiled vb.net application will fail with error
Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType,
String name, Object[] args, String[] paramnames, Boolean[] CopyBack)[code].....
Same code will work with vb6 app with multiple WebBrowser controls
Edit: This code is comipled with: Option Strict Off
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Aug 19, 2011
I'm trying to populate the list of a combobox by binding it to a datatable. Also, I want the selected value of the combobox to be bound to an object property so that when the selected value changes, it's automatically updating the object. However it's causing an error at runtime: "This causes two bindings in the collection to bind to the same property.
Parameter name: binding" I thought binding the dropdown list to a datatable and the selected value to an object were different properties but obviously I'm not getting it right.
Code:
Private Sub PopulateSiteSelect()
With Me.PlanSiteSelect
If _Plan.PlanID <> Nothing And _User.UserID <> Nothing And _Plan.Category <> Nothing Then
[Code]....
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Nov 28, 2010
I created save,delete,next,last buttons.How do i correspond them with the navigator control.This is what i need to do as per the assignment.Both the customer and order tables should have buttons which correspond to the BindingNavigator control. There should be NO BindingNavigator controls. The user should be able to save, delete, go to the first or last record, or go forward or backward one record at a time.
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Jan 12, 2012
I am able to bind my datasource to the textblock for the display text. However I would like to set the Fontweight to bold if the value of the checkbox foo is checked. I'm trying to use IMultiValueConverter to accomplish this, but have had no luck so far.
<CheckBox Name="foo"/>
<TextBlock Name="bar" Text="{Binding Path=Name}">
<TextBlock.FontWeight>
[Code]....
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Sep 14, 2010
I'm using the following code to bind watin to a webbrowser on the winform.
Dim w As IE = New IE(WebBrowser1.ActiveXInstance)
Settings.AutoStartDialogWatcher = False
w.GoTo("http://google.com")
I can see from wireshark that the page get's loaded, but the form is frozen until a exception gets thrown "Timeout while Internet Explorer busy". Is there a way to bind watin to the webbrowser control?
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Jul 1, 2009
I have been working on keeping things object oriented for my project. Currently, I'm using a .DLL which supplies all of the app's classes to the WinForms project acting as the presentation layer.My .DLL will, for example, return a SortableBindingList(Of T) to code in a form. The SortableBindingList(Of T) comes from here. Let's assume a SortableBindingList(Of Product). Assuming that the .DLL's function Services.Products.GetList() returns a SortableBindingList(Of Product), I can easily do this:
DataGridView1.DataSource = Services.Products.GetList()
Now, the DataGridView is properly populated with my list of Products. Fine. However, there is no .SelectedItem property which gives me back my object which was selected in the DataGridView:
' Doesn't exist!
Dim p As Product = DataGridView1.SelectedItem
' Need to make another DB call by getting the Product ID
' from the proper Cell of the DataGridView ... yuck!
However, a ComboBox or a ListBox does in fact store and return my Product objects intact:
' Valid!
ComboBox1.DataSource = Services.Products.GetList()
Dim p as Product = ComboBox1.SelectedItem
Another however ... the ComboBox and ListBox do not show all of the fields of the Product object, only the value of the DisplayMember property.Is there a nice control in VB.NET 2008 that I am just missing, which gives me the object oriented functionality that I want which will actually display an entire object's fields and also return that object back when selected by the user?
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Jun 8, 2012
i am getting error when i connect to oracle DB. am using the connection string statement using ODBC DRIVER. i want to get some data from orcle db and bind it into some control. oracle client is installed in my machine.my db name is PINDB it's in another server. Not in localhost. am creating oracle driver named as obdialer il localhost local host ip adress is 10.103.1.166 the DB is placed in this server (IP 172.23.6.217)
user id is RAM
password is RAM
in my programme am using the connection string as like this.
code
----
conn.ConnectionString = ("Driver ={Microsoft ODBC for Oracle};server=172.23.6.217.PINDB;Uid =OEARENEWAL;Pwd =OEARENEWAL;Persist Security Info=False;Trusted_Connection=Yes")
try
[code].....
i didnt get any error and also the values are not bind to that particular control.
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Nov 10, 2011
I am trying to bind a dictionary to a repeater control. I have a dictionary object which is filled with the Key (as String) and values as (Class object). I receive Object reference error when I try to DirectCast() the e.Item.DataItem to a Key-Value pair of that dictionary used for binding repeater. If you check the second screenshot, the e.Item.DataItem value is "Nothing" because of which I am getting Object reference error. What is the reason that the value is e.Item.DataItem is coming as Nothing?
aspx.vb code behind:
Private Sub PopulateRepeaterValues()
Dim tGetAddItemDtlIn As New nsFWTypeAdm.Item.cdtGetAddItemDtlIn
Dim tGetAddItemDtlOut As nsFWTypeAdm.Item.cdtGetAddItemDtlOut
Dim objItemDL As nsFWIDataAdm.IItemDL
[Code] .....
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May 29, 2009
I'm hung up on the syntax to bind a value to a combobox control. I store the ID of the value in a database. I want the value to show in the combobox control. How do I do this? [Code]
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Feb 26, 2009
I need to create a new tree view, that is linked to a particular table.
Each row in the table has a parent id that links back to the table's primary key, and that defines the node hierarchy. So that relationship needs to be indicated in the databinding.
Am I able to use the standard treeview control in Visual Studio 2008, or do I need something extra to make this work?
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Dec 3, 2009
Resources: Visual Studio 2008 Pro (currently in 90 days trial)
Platform: OS - Vista Home Prem 64-Bit
Language : Visual Basic
I'd like to bind my textbox into two (column)from different table is it possible to do this? I already know how to bind (one-to-one) controls and table.
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Feb 23, 2009
I'm trying to integrate a custom control that I built into my vb.net project. My control contains 4 text boxes Month, Day, Year, and Time. My database field is a datetime field in SQL Server 2005.I am able to bind the data, but my control doesn't work when a date isn't entered. I'm pretty sure that this is a DBNull issue. I need to be able to insert NULL into the database when a date isn't entered. When a date is entered, I want to insert that date into the database. With the below code, I can't tab out of my control when a date isn't entered.
[Code]...
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Jun 25, 2010
vs2010 vb.net WPF project
This is an experiment to learn something.
I have a class called logitem
it has a datetime property, and a message as string property
I have declared myLogEntries as List(of logItem)
I have a ListBox.
Ok now what?
I have searched but i am getting lost in all the examples.
I have set the ItemsSource=myLogEntries
I think i need a datatemplate or maybe to specify binding source.
I am doing all this in the wpf form loaded event.
I guess i need a sample code for binding a list of collection to a listbox.
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Jan 15, 2012
I created a table in mySql named 'user' where fields are:
UserID,UserFirstName,UserMidName,UserLastName,Username,UserType,AcctPassword,DateCreated, DatLastModified and IsDeleted.
[code].....
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Dec 22, 2010
I am using Visual Basic 2008 Pro. I am trying to figure out how to bind a set of column headings in a DataSet (or DataGridView) to a ListBox. I want to show the column headers in the listbox control (not the data), and allow users to select one or more items
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May 11, 2011
I am trying to bind a DataGridView control on my windows form. However, it doesn't appear to be working. Am I missing a step somewhere? I cannot get the objects in my collection to display in the DatagridView.
Here is a sample of my code. I have not included the Person class.
'CREATE A COLLECTION OBJECT.
Dim p As New List(Of Person)()
'ADD PEOPLE TO COLLECTION.
[Code].....
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May 14, 2011
I have a custom control defined in code-behind:
Public Class MyControl
Inherits Button
Private _A As String
[Code]......
What code I have to write to bind to those properies?
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Oct 16, 2011
I'm trying to bind a WinForms TreeView control to some user-defined objects. In particular, I'd like to bind aTreeNode.Text property to myObject.Name. My strategy is to create xTreeNode, a subclass of TreeNode, add a DataBindings collection, and expose its Text property. This would allow me to write some code like this:
Dim oBinding as Binding
Dim bs as New BindingSource
bs.DataSource = myObj
[code]....
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Nov 30, 2011
I think my subject sums up what I am interested in knowing. I am looking to create a chart where Series1 is from Table1, Series2 is from Table2 in the given Dataset. My code below doesn't throw any errors, but it appears to be grabbing the data for each series from the first table.
Imports System.Windows.Forms.DataVisualization.Charting
Public Class Form1
Public Sub New(ByVal ChartData As DataSet)
' This call is required by the designer.
InitializeComponent()
[Code] .....
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Apr 19, 2010
I am using access database to store my datas?I have used a datagridview to present the data to the user.I want to give the date filter option to my users.How can i bind the datetimepicker control with my datagridview.one of my datagridviews coloumn is contains date string.
Private Sub btnViewAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnViewAll.Click
'Declaring connection string
Dim objConn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source = D:queDB.mdb")
[code]....
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Oct 14, 2010
Using VB 2008. We have an app with a third party grid on it works well enough. This is a small utility within a bigger suite, and adding/updating it involves a simple EXE copy. The issue I am trying to address is that not all customers will have the 3rd party controls on their systems, and we want to avoid deploying them if we can.
Can I build the app so that if the controls are present, the app uses them. But if they are not present, I use a simpler control? I picture using a 'launcher' form that tries to load Form2 with 3rd party. if it errors, then just load Form3 with common controls. But can I even get to that point? With missing controls, will the app even load? I understand Late Binding for objects, but this is a control right on the form. Can I late bind a control and add it to form dynamically perhaps?
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