i have a problem with databinding. i have a textbox, i receive an integer value in textbox.tag, after i try to bind but textbox1.tag loss the value always has a 0.how can i get the value on the tag property?.
View 2 RepliesI have a listbox with several list items added. I want that as user click on an item, I should be able to show its property. This should change for different items. For example (hypothetical) : Listbox has numbers 1 - 10. Now when I select 1 I should be able to set property - Name, Lastname, Colour, Age.
When I select 2 I should be able to set - Age, Hair Colour (clr shows), Weight, Date. When I select 3 then - City (combo box drop down), Country, Age only. This way value changes for diff items. One way is to put them in property grid and show them. Though this looks nice but adding/removing items in that is not easy. You need to have a class that refer that to prop grid. Do I have to code for each classes for all values in listbox or is there an easier way to manage items in property grid. If you think prop grid is not the right tool for such an activity then can you suggest something else.
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!
The header of DGV in vb.net have a property that can't i found in the properties. when we click in the header the DGV reorder the values of this columm. what is the property to disable this function?
View 8 RepliesI have a question thats been bugging me for quite some time now.Recently, I've created a ButtonRow control which is meant to host several buttons on its surface. These buttons are added through a collection property using the property grid of the VS IDE. The property is tagged with the DesignerSerializationVisibility(DesignerSerializationVisibility.Content attribute.The objects in this collection are serialized to the designer code of the form or usercontrol on which the ButtonRow is placed. Now it all works fine and everything except that I cannot implement a Name property. I'll explain what I mean by this.
If you've ever used the DataGridView control, you'd notice that the columns work in the same way that buttons work for my control ie a serialized collection. However, the DataGridViewColumn has a Name property which can is used as the variable name when the column is serialized into designer code.
Example: If you place a DataGridView on a form and add a column and change its Name to lets say "AGreatColumn" then the designer would serialize the column as such:-
[Code]...
I went as far as using .Net reflector to decompile MS source code to see how they may have achieved this but I could not find the secret. Also notice that the designer serializes my objects using a Dim statement but the DataGridViewColumn uses a Friend Withevents declaration at the bottom of the designer code file(I didnt it included above)
I have a mdi container thats got 9 forms running in it.When I minimize a form it minimizes into a small "window" in the left-bottom corner of my mdi-container.
How do I change this so that the forms will minimize to the Left-TOP corner of my mdi-container?
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]....
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]...
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."
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.
View 2 RepliesI 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.
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?
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.
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]....
I have a weird question and I honestly hope you understand what is happening here: I design my form (using VB.NET) and put on it a few textboxes, comboboxes and a listview. After the design, I want to adjust the TabIndexes for each control on the form. On the right-hand side of the interface is the property box.
I then select the 'TabIndex' property item and enter a number key (for instance 0) for that selected item. I then select the next textbox control and enter the next number (for instance 1) WITHOUT re-selecting the 'TabIndex' property item. As soon as I select the combobox or listview control, the currently selected property item jumps to 'Items' or 'Collections' and does NOT remain on the 'TabIndex' property item. Why is this happening? Everything worked fine and all of a sudden this starts happening. Should I reset the editor settings or how can I resolve this matter?
in vb 5 there was an add in wizard that helped create a property page for usercontrols. Is there something similar for vb2008. I thought I found it once but can't find it again?
View 2 RepliesIs it possible to get the Tag property of another .NET form running in a seperate process?
View 11 RepliesHow do I make a property to have a set of selectable values, in a way such that they work by intellisense-drop-down, as i.e. the color.white, color.black etc.? I want to do this like for integer values I may want to have selectable by "keywords" with the hard values only existing in a unique class file, or whatever is necessary ..?
View 2 RepliesHow do I set a property from within the class it is defined in?
View 2 RepliesI am trying to add an ArrayList property to a UserControl with the following
Private _hist As ArrayList
Public Property History() As ArrayList
Get
Return _hist
End Get
[Code]...
I get an 'Object reference not set to an instance of an object' error.
What is the difference between these two methods for defining property value defaults? [code] Is there a reason to use one method over the other for defining the default property values in a class?
View 24 RepliesI am using Visual Studio 2008 and when I am presented with a list of properties after a dot I can only use tab to select one property. If I use enter the property is selected but the cursor is placed in another line. Can I use enter just for selection?
View 1 RepliesI have Nullable properties in my class:Public Property FileStatusID() As Integer?
Get
Return m_FileStatusID
End Get
[code].....
I am trying to get the filename from the OledbConnectionStringBuilder Property. I have the following
Dim DataString As New OleDb.OleDbConnectionStringBuilder(My.Settings.RestelConnectionString)
Dim DBFilename As String = DataString.FileName
DataString returns C:Documents and SettingsMartinMy DocumentsVisual Studio
[code]......
My problem is I'm am trying to connect to a db2 table but no matter which connection type is use (adodb, oledb, db2) I keep getting the same error message when I get to this statement: objConn = New (adodb, oledb, db2).connection. "Property evaluation Failed".
View 7 RepliesI need some advice: I need to create an app involving draging images to a treeview. What should happen is once the image is dragged to the node it must take an instance of a property. For example
[Code]....
I have a UserControl that retrieves a bunch of data from a database. It uses the current date as one parameter to determine which data to show.
The database however is a little old and has no data available after April 2009, so while debugging I cannot get any data and hence I can't test the control.
As a solution I simply used a date in the past instead of the current date, just so I could see some data. Obviously, this has to be changed in the release version of the application, but I'm worried it will be forgotten, leaving the control completely broken, and worst of all, it's very hard to tell that it is returning the wrong data, so the users won't see the problem at all.
Now, I'm looking for a way to change the date used during run-time. A property in the UserControl would be the best solution for me. I could have a property UseTestDate or something, and if that was True, the test date was used. It would be set to False by default, so that the regular date is used by default.
The application has a Property Grid which is used to change the properties of the UserControl, so that's how the (test!) user can change this property. He can choose to show the current date (but there probably won't be any data preset), or he can set the UseTestDate property to True and get some old data.
The problem, obviously, is that the end user in the final application will also see this property in the grid! I don't want that obviously, there is no need for them to use a test date.
So I am looking for a way to make this property visible only when the application is run in DEBUG mode (via the VS IDE). I can make a property invisible simply by setting the Browsable attribute to False. I simply don't know when to set this. The attributes only allow a constant, so I cannot use a variable that is True when the application is in debug mode or something.
I tried simply putting the whole property between a conditional compile statement:
#If DEBUG Then
Private _UseTestDate As Boolean
Public Property UseTestDate() As Boolean
[code]...
I am able to Run the application in debug mode, even though there is the error that UseTestDate cannot be found. It seems that the property can be found when I run it (which makes sense of course, as it's only compiled when in debug mode). However, using that code I am unable to Build the application so I can run the executable; the error does not 'vanish' then...
So, how can I build an application that uses a property that is only compiled when the application is run in debug mode?
VS 2008 [RESOLVED] Property only visible during DEBUG
View 1 RepliesBasically I have created an object that has a graphicspath as one of its properties... and i want to serialize it...
I was basically wondering if i could somehow automate the serializing of the GraphicsPath to another object (for the purposes of serializing since the graphicspath cannot be natively serialized)
eg serialize it to a list of the following class:
vb
<Serializable()> _
Public Class sPath
Public PathPoints() As PointF
[Code].....
I am trying to allow changes to our database through a timecard program. We use and Image database and I am using VS 2008. I am getting the error: (MDMDA) Unable to change property. The trouble shooting tip tell me "check the error code property of the exception to determine the HRESULT returned by the COM object." The error line is in bold.
If Not Trim(frmMantime.txtFunc1.Text) = "" And Not frmMantime.txtRec1.Text = "" Then
'Update Record
lngRecordNumber = frmMantime.txtRec1.Text
[Code].....