How To Make Property Read Only
Feb 25, 2009
I have a class which contains the object and a collection for that object. I want to make a property readonly to external calls, but allow access to that property from the collection class. I know I can use:[code]But, I want to the PreviousRow property to actually show as "ReadOnly" in the intelisense of the calling code of client app. The above does not. The only way that I see to make it show as "ReadOnly" in the called code is to mark the whole property as ReadOnly, but the problem with this is that my collection class code can no longer access this property:[code]I tried using the "Friend" declaration, but that seems to still allow Write access to the calling code.I only want write access from within the RowCollection class.
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Jan 12, 2010
What is the best way to make a class property "Write Once, Read Many" such that you can only set the property once?
I know that I could pass all the properties in the constructor and make them ReadOnly, but in cases with a lot of properties I don't want a constructor that has 20+ arguments.
Also, I realize I can "roll my own" setters, but having to do that for every property seems like a bunch of redundant coding.
Is there a clean way to do this in VB 2008 .NET 3.5?
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Mar 23, 2011
Conceptually it seems like a derived class should be able to override a readonly property with a read write property. Why isn't this possible?
[code]...
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Oct 18, 2011
The code below does not alter the value of the TextOut Property in the sc object (an instance of SomeClass).But none-the-less the Set routine for TextOut is invoked.There's no other way that the TextChanged flag could become True.But that's what happens when I run the code under VB2010 Express (the only place I have tried it).
Does anyone think that this is not a bug in the compiler?
I know that the problem is related to, maybe caused by, the fact that the first argument to LookAtTextOut ("whatever") is passed ByRef.But I do not see how passing an argument ByRef should result in calling a Property's Set routine when there is no code in the subroutine which changes the argument.[code]....
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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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Feb 21, 2011
I have the following property in a property grid in VB.Net 2010.
<Description("Rapid Entry Post Car Wash Settings CarWashOptionPushButtons"), _
Category("Post Car Wash")> _
Public Property CarWashOptionPushButtons() As String
[code]....
I need to make this property a list box that gets the values from a database table and populates the list box with the values from the table. I have tried numerous things to no avail.
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Jul 15, 2009
What is a public read only property?If you're not living on the edge, you're taking up too much room
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Mar 17, 2010
What will be the code when I try to make a combo box read only?
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Aug 12, 2011
How to declare property which can be modified in project mode but will be read only in runtime mode?
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Jan 2, 2011
Let's say we have a class, let's call it CLS_Object for simplicity. Now, suppose CLS_Object has 2 public properties, "Name" as String and "Value" as String. These have both read/write methods into the properties.
Now let's go to a seperate class, let's say CLS_Example. Let's create this variable:
Public
_OBJ_Object as New CLS_Object
Now, let's create a property, called PROP_Object that is READ ONLY...
Public ReadOnly
Property
PROP_Object As
CLS_Object
If we allow that to return _OBJ_Object, the user can the also SET VALUES to that object. In the context of "well, the property is returning the object and you are writing to the object, not the property", I understand this behavior. But it means you can write to a read-only object of sorts.
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Oct 29, 2011
I am really getting out of control with this small problem and unable to rectify it?Here is my code:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim installed_fonts As New InstalledFontCollection
[code].....
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May 1, 2009
Is it possible to read a label's text property of another app? I know how to get the handle of the main window, and how to get the handle for a child. But the problem is that there's like 20 other labels on the window and when I use winID to get it's class, it's just "Edit", and it's the same for all the labels. And the title is the value of the labels text property. [URL]
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Jul 27, 2009
I have used thirrd party tool from BigSpeed for file transfer. When ever I am trying to assign a value from (txtUserName) to the property like
FileTrans.GetUserName=txtUserName.text.trim
It gives error as Readonly property..... That means I can not assign a value to it.
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Dec 9, 2011
I have a class with many properties to which I need to assign values.I have another class with a sorted list of data from which the assignments are to be made. Is there a way to get the names properties from a class and refer to those properties?I looked through System.Reflection.Assembly but could not find a way to do it.
Class DataMngr
Sub ManageData()
Dim sl As SortedList(Of String, Double)
sl = GetData()
[code]....
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Apr 18, 2012
I'm struggling a bit with Entity Framework 4.x. Let's say I have a model called Product. It was generated from a database table. There is a field in this entity called CreatedDate. The MySQL database has a default value for the current timestamp. I don't want Entity Framework to set this field when inserting or update the table. Problem is, I can't seem to figure out how to tell EF to exclude this field from being sent back to the database, but still retain it as a field to be viewable in the application.
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Jan 14, 2011
On a given application form, I have around 20 controls that I need to set in the main form. I have a separate thread that only needs to ready some properties from the controls on the application form It will never try to write to the form's controls.
[Code]...
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Jan 2, 2012
I have a form with about 48 checkboxes.I have a public sub that reads a webpage, parse the text of that site to get the values that correspond to these checkboxes.For example: one of the lines would be: "Exterior = 255", or "Street = 0".I do have check boxes that called "Exterior" and "Street". the question is how I can get my sub to address the appropriate control so I can set its "checked" property based on the text read.
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Apr 1, 2010
Can any one tell me how to read or write the control property values that has been saved as ocx state value in the XML? I have some controls. I am assigning a property values for that controls and it is saving as binary64 format. I need to automatically assign property values in the binary64 format in xml.
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Nov 28, 2009
Is there a tab property I can assign to make a given tab not only the "top" (or active) tab but also the left most or is there another way to do this?(It seems pretty straight forward to make a tab the top or active tab.)The requirement is that I've got one tabcontrol that contains a potentially large number of tabs. Each member tab has a right fair number of controls and dialogs.These tabs are all grouped by fours sequentially. For example, tabs 0-3 are one group, 4-7 the next group, etc.I'd like to control the display of this tabcontrol from a different tab control. This second tab control contains high level information about the 1st tab control as well as a lot of other things pertaining to all four tabs that the user needs to see as well.For example, if I've got 8 total Tab1's, then I've got 2 Tab2's.When Tab2(0) is selected, I'd like Tab1's leftmost item to be Tab1(0). When Tab2(1) is selected, I'd like Tab1(4) to be my leftmost tab in Tab1, rotating the lower 4 out of view for the time being.
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Mar 10, 2009
this is the code for my property
Dim _playernumber As Integer
Property Player() As Integer
Get
[code].....
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Aug 13, 2009
Is there a way to tell VB.Net to use a type instead of a local property name when there is a naming conflict in your code?
Public Class MyClass
private mBedrag as single
Public Property bedrag() As Single
Get
[Code]...
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May 4, 2010
Imports Microsoft.VisualBasic
Public Class DealSlot
Private mSlotType As String
[Code]...
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Oct 21, 2009
I have a situation where a class's properties are being exported/imported from an Excel sheet. Each property is in a specific column, so I want to make a mapping between each property and column # (a Dictionary collection would be sufficient). That way I can just loop through each property and/or column in the dictionary when read/writing data (maybe something like Class1.PropertyA = ws.Cells(curRow, Propto ColDictionary(PropertyA???).value). But, you obviously can't treat properties like other value types, so I don't know how I would store a property in a dictionary for this purpose. So could this sort of thing be achieved via reflection, or am I off-track?
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Apr 25, 2009
I just stumbled over this in some C# code...:public Foo Foo { get; private set; }
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Oct 22, 2011
I want to make something similar to the listbox.children property. I know I can write this to return the children of the listbox:
[Code]...
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Aug 15, 2010
How 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 ..?
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Dec 30, 2011
I'm in the process of making a usercontrol and i've run into the problem of how to make a property page. Obviously this makes setting up you control nicer and more importantly to my program makes loading the form faster (setting the properties in the load event vs property page). I was trying to find something to start on but i didn't find a propety page in the "New Item" menu or even something like the "Property Pages" property of a usercontrol in vb6 where i've done this before. How can i make the equivalent of the vb6 property page in vb.net? Maybe with a form or a dialog?
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Jul 7, 2010
Public Class Customer
Private m_CID As Integer
Private m_FirstName As String
[Code].....
My question is that do I need to add an OID in customer class or I can directly send a query to customer table when ever an order is made.
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Nov 23, 2011
how to create a property like this:[URL]
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Mar 28, 2011
Public Property TabsCollection()() as String()()
Get
Return _tabsCollection
End Get
[code]....
but it errors saying: End of statement expected.
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