Databinding An Object Property And Modifying Another Property In Code?

Jan 15, 2010

on a Windows Form, an object myObject is bound to myObjectDataBindingSource like this:myObjectDataBindingSource .DatSource = myObject on the form, i have a check box bound to the property: chkProp1 for example of the object: myObjectDataBindingSource In the code when the checkbox is clicked, I need to go in code and change another text property of the object txtProper2 for example like this:

Private Sub chkProp1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkProp1.CheckedChanged

[code].....

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WPF Databinding ListView To A Property Of An Object Which Can Be Nothing?

Dec 7, 2011

I'm trying to create a Window with a ListView and an Area where details to the selected Object are displayed. The Listview displays items stored in an ObservableCollection(Of T) Collection. The items itself contain also an ObservableCollecton(Of T) Collection which should then be displayed in the details area in another ListView, accordingly to the selected item of the first ListView.

The Problem: The InitializeComponent() throws an Exception (XAMLParseException).

Exception:Set property 'System.Windows.Controls.GridViewColumn.DisplayMemberBinding' threw an exception.

InnerException:Object of type 'System.String' cannot be converted to type 'System.Windows.Data.BindingBase'.

The Line- and ColumNumer of the Exception are Pointing at the <GridView> of my ListView (.View).This is the First ListView

<ListView ItemsSource="{Binding Path=MyObjectCollection, Mode=OneWay}" SelectedItem="{Binding Path=Selected, Mode=OneWayToSource}">
<ListView.View>[code]....

So. How can I bind to the Collection Property of an Object could be nothing?

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.net - Getting Base Field Type When Databinding To A Decimal (or Object) Property?

May 28, 2012

I've got a custom NumericEditor control that has a nullable Decimal property called Value. When I bind a data field to Value, I'd like to retrieve the underlying Type of the data that's bound, so that I can restrict the use of decimal places if the source field is an integral data type.I figure I'd have to do this in the BindingContextChanged event, but how do I get the Type of the data field from the binding itself? My Google-Fu is failing me at the moment.

In short, I'm looking for something like the GetValueType method mentioned in the following question: Simple databinding - How to handle bound field/property change. Winforms, .Net I imagine this method would also be handy if the Value property was an Object.

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Reflection - Find From A Property Info Object If That Property Has A Non Public (Private / Protected) Setter?

Aug 27, 2009

I searched on the forum / Internet for the solution how a PropetryInfo object (of a Public property) can reveal if it has a Private Protected Setter ... it was all in vain .... all help I found was about how to "Set" value of a public property having a Private Setter.I would like to know if I have a PropertyInfo object of a public property, how would I know if its Setter is Non Public?

I tried, in a exception handling block, where I did a GetValue of the PropertyInfo object and then called SetValue by setting the same value back... but to my surprise it worked well and didn error out.

[Code]...

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Assigning An Object Property Using A Variable As The Property Name?

Aug 4, 2009

I want to assign an object property by referencing the property dynamically, with a variable name

i.e.

dim propName as string
staticObjectName.propName = 'whatever

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.net - Databinding A Property With A Parameter?

Apr 23, 2010

I would like to databind to a property that requires arguments.

I thought about defining custom columns and cells because the parameters that the property requires are available from the within the object bound to the row, but I'm having trouble materialising this idea.

As an additional problem, that I think leads on from this, I have also created a custom column and cell for the datagridview that takes the implementation of an interface during it's construction. I have added this column to the datagrid view programmatically (passing the Interface implementation to the column constructor). I've overridden the paint method which evaluates a property from the Interface implantation using arguments from the other rows in the column, but it doesn't seem to call the paint method at all. Even on DataGridView.Refresh(). Essentially I would like this column to also update, evaluate a property from the interface implentation using arguments from the underlying object bound to the row and print this number in the cell.

The reason for this second problem is so that I can implement the interface many different times and just at a column dynamically to display it's evaluation.

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C# - WPF Databinding To A Property In The Same Control?

Nov 23, 2010

In this example the IsEnabled property of my button is bound to the selected rows "Local" property of the grid and it works just fine:

<Button DockPanel.Dock="Bottom" Width="100" Height="100" IsEnabled="{Binding ElementName=dataGridRestore , Path=SelectedItem.Local}"></Button>
<my:DataGrid x:Name="dataGridRestore"
ItemsSource="{Binding}"

[Code]...

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Databinding On A Property Of A UserControl In DetailsView

Mar 31, 2011

I have developped a usercontrol, but I can't seem to find how to databind on a property of the usercontrol in a detailsview.[code]

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Databinding Visibility Property Of A Textbox?

Nov 27, 2010

I seem to be having a problem binding the visibility property of a textbox to a database value using the advanced binding property.I found this article (BUG: Inconsistent behavior when you bind the Visible property of a Windows Form control to a Boolean field) stating there is a bug in some ol

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Asp.net - DataBinding: 'System.String' Does Not Contain A Property With The Name 'dbMake'?

Jan 25, 2010

I am a newbie at ASP.net and after using sqldatasource with a listview to insert and show results from an SQL server db I want to try using the LINQ datasource since it seems to be more flexible in codebehind.
My problem is this: I droped a listview control to the page and I created the Linq datasource in codebehind with vb. the issue that I am having when I ..Select d.columms name i get the error system.string does not contain a property with the name "columname".. if i ommit the column name then its works fine.. the funny part is the d.count works fine but after that i get the error.. please see my code below:

[Code]...

b.dbMake needs to work so that i can use Distinct ,, ia m using asp.net version:3.5 and IIS version 7.0 ..
not sure what i am missing ,, but i did try alot of approaches,,1- checked the web.config file and it seems to have two assemblies and two namespaces for LINQ..2- used different databinding syntaxs,,and i searched a lot for the solution.. the last one i read the person ommited the name of the column,, i thought that wasnt the best solution.. also my dbMake column is comming up in the "intellisence"

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Databinding A Custom Property On An Inherited Control?

Apr 26, 2012

I am creating an Extended DateTime picker. I have created a Class the inherits the Default DateTimePicker and Adds a new Property NullableValue. I have placed the control on a form and bound it to a Binding Source using the NullableValue Property. When I load the record the control updates as it should. But when I change the value and save it does not save back to the database.

[Code]...

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Forms :: Databinding Visibility Property Of A Textbox?

Dec 5, 2009

I seem to be having a problem binding the visibility property of a textbox to a database value using the advanced binding property.

I found this article (BUG: Inconsistent behavior when you bind the Visible property of a Windows Form control to a Boolean field) stating there is a bug in some older versions of the .net framework.

Does anyone know if this has been fixed in 4.0?

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Populate Text Property And Items Of Combobox Not Using Databinding?

May 12, 2010

I'm rewriting a VB6 application in VB.Net. So far I have 2 forms, frmLocations (frm1) and frmLocationInfo (frm2). frmLocations has a combobox, cboLocations, from which a selection is made and an "Ok" button is clicked, which then loads frmLocationInfo. frmLocationInfo has a series of textboxes to display info corresponding to the location that was selected - Location, Location Number, Phone, Fax, Email. There are also 3 comboboxes on frmLocationInfo - cboDepot, cboFreight, and cboDispatcher. I need their text property along with items to be populated, also with data corresponding to the initial selection made on frmLocations. I'll spare you all the difficulties I'm having w/the other comboboxes, and instead focus on cboDepot. I have gotten it to populate its text property to display the corresponding Depot, however, the items are not populating and all you see now when you click on the dropdown arrow is only the depot that shows up in the text property.

Here is the code for this portion.

frmLocationInfo
Private Sub FillDepotCombo()
Dim sql As String = "Select distinct depot.depot_name, depot.depot_refnbr, locations.site from depot inner join locations on depot.depot_refnbr =

[Code]....

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.net - 'Property' Cannot Implement 'Property' Because There Is No Matching Property On Interface 'IName'?

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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Compare An Object Property To Another Object Property?

Jul 4, 2011

I have a listbox of a object called Account, which has 2 fields, password, and username. How can I compare a New Account to all the accounts in the list and see if the password matches?

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.net - CLR FormatException Thrown When Databinding An Int32 Field To A Nullable Decimal Property?

May 28, 2012

I have written a .Net 4.0 Winforms Numeric Editor control (which inherits from TextBox), and I have added a Value property that is a nullable decimal type, as follows:

Public Class NumericEditor
Inherits TextBox
Private _value As Decimal? = Nothing

[code]....

how to get around this exception, particularly when I'm databinding a number field to a number property, and there should be no string conversion happening. (To further complicate things, I'm using a similar technique for another control where I databind a DateTime field to a nullable DateTime property, and that control works just fine.)

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Simple Databinding - Handle Bound Field/property Change - Winforms / .Net?

Oct 19, 2009

I have a custom control with a bindable property:-

Private _Value As Object
<Bindable(True), ... > _
Public Property Value() As Object
Get

[code]....

Also, here, I'm adding a handler to the DataBindings.CollectionChanged event.This is the second place that I retrieve the type:-

Private Sub DataBindings_CollectionChanged(ByVal sender As Object, ByVal e As System.ComponentModel.CollectionChangeEventArgs)
If e.Action = CollectionChangeAction.Add Then
Dim b As Binding = DirectCast(e.Element, Binding)

[code]....

I need the first place, because the BindingContextChanged event is not fired until some time after InitializeComponent.The second place is needed if the binding field is programatically changed.Am I handling the correct events here, or is there a cleaner way to do it?

Note: My GetValueType method uses the CurrencyManager.GetItemProperties....etc, to retrieve the type.

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Property Of A Property Of An Object

Dec 22, 2010

[code]I understand the error is saying I've got a null pointer reference happening, but I don't understand why.

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C# - Modifying Data With ListView EditItemTemplate By Settings Its Data Source Property

Feb 22, 2011

Modifying data with the ListView's EditItemTemplate by programmatically settings its DataSource property and calling its DataBind method. I don't have option to use data source control for ListView. All ListViews are bound with data from code-behind. So, I have to handle the Edit/Update mode of ListView manually. [Code]

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Error In VB Code "Name Of Field Or Property Being Initialized In An Object Initializer Must Start With '.'_"?

Feb 9, 2010

[code]......

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Error In VB Code "Name Of Field Or Property Being Initialized In An Object Initializer Must Start With '.'_"?

Jun 16, 2009

Error in VB code "Name of field or property being initialized in an object initializer must start with '.'_"

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Handle An Object's Object Property Changed Event In .NET Windows Forms?

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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.net - Object Reference Not Set To An Instance Of An Object: Child Property?

Nov 21, 2011

I'm checking If a border's child property is not set to nothing or equal to a given element, but whenever I run the program, it says that it's set to nothing and crashes. Here's my code:

If Not Me.Child.Equals(Nothing) Then ...
If Me.Child.Equals(value) Then ...

Both gives an error. What should I do to pass these lines? Also in C# it would look like this:

if(this.Child != null) ...
if (this.Child != value) ...

But this time it doesn't give an error.

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.net - If An Interface Defines A ReadOnly Property, How Can An Implementer Provide The Setter To This Property

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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Error - In Order To Evaluate An Indexed Property, The Property Must Be Qualified And The Arguments Must Be Explicitly Supplied By The User

Jun 20, 2012

I'm having a few problems converting some code into VB.NET from C#. Most of the translating is done, but I am getting errors when I try to run my code, and I can't figure out what is causing them. Here is the Sub I translated.

Public Sub CreateWidget()
Dim blue As LCDColor
blue.Red = 0
blue.Green = 0

[code]....

The error I receive on this line ("vision.Widgets.CreateWidget(wg1)") reads "In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user."

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Runtime Error '-2147418113 (8000ffff)':Could Not Get The CurLine Property. Unexpected Call To Method Or Property Access

Sep 24, 2009

start with I was given a program by a friend that was created in Excel 2003 with the help of Visual Basic Editor. He said he used Visual Basic 2003, which he is not 100% sure about. Anyways he used CurLine in the program and when I try to open it in Excel 2007 and then open the Visual Basic Editor and run the program I get the following error:Run-time error '-2147418113 (8000ffff)':Could not get the CurLine property. Unexpected call to method or property access.

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.net - Make A Class Property Behave Like The Checked Property On RadioButton?

Jun 1, 2012

I have a very simple class that holds a few public properties - ID, Text, Colour, etc. and a Boolean called 'SelectedItem'. Just like the Checked property on RadioButtons, only one item can have its SelectedItem property set to True within a particular group. Note: there will be several separate groups (lists), each allowed to have only one item with SelectedItem = True.

My first thought was that I would probably just have to handle everything outside of the class, setting SelectedItem to False for every other item in a particular list when another item was selected. But that seems rather inelegant to me. So I've been trying to think of how this might be done within the class. For example: could I perhaps have a private string property called say "GroupName" - set in the New sub when adding a new instance of the class - and then use a private shared method to set every item's SelectedItem property to False, provided the item has the same GroupName as the newly selected item? I would have a go at doing this but I have no idea how to enumerate every instance of a class from within that class, or whether that's even possible. Is it? Or is there another (better) way to achieve my goal? Here is a cut-down version of what I've got so far:

Public Class ResourceItem
Public ID As Integer
Public Text As String[code]....

As can be seen: instead of instantiating a new ResourceItem and passing that as an argument to the manager's Add procedure, I'm simply passing the details of the new item and the procedure is creating the item from those. I don't know whether this is a good or bad idea - please advise - but I've done it because I couldn't figure out how to make the SelectedItem property only writeable by the manager, so I wanted to avoid having directly accessible objects that could have their SelectedItem property set to True without it deselecting all the other items in the same group. Of course that still leaves the possibility of setting a variable to one of the manager's list items and setting it from there, so I would still like to know how I could prevent that, if possible.

UPDATE: I didn't use the code above in the end, deciding instead to go with Cyborgx37's solution - which seems to work perfectly well for me despite the warnings about best practice. I also realised I would need to use the same class in another scenario where multiple items could be selected, so it was easy to add a Boolean property to the manager to enable that.

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Asp.net - Identifier Expected And Property Access Must Assign Property Or Use Its Value Errors

Nov 14, 2011

Using the following code I get Identifier expected and Property access must assign property or use its value errors:

ViewState["SomeKeyValue"]
What is wrong with this code?

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Bind A Dataview.count Property To A Textbox.text Property?

Aug 3, 2010

I have a dataview an i would like to show the count property in a text box.

i tryied the following

me.textbox1.DataBindings.add(new DataBindind("Text",DataView,"Count"))

But i have a exception.

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C# - Why Is Attached Property Property Changed Event Only Firing One Time

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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