Read Only Property Not Truly Read Only?

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.

View 7 Replies


ADVERTISEMENT

Why Cant A Readonly Property Be Overrided With A Read/write Property In .net

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]...

View 4 Replies

Read Property Invokes Property's Set Routine?

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]....

View 11 Replies

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.

View 9 Replies

Public Read Only Property

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

View 2 Replies

Read Only Property For Combobox?

Mar 17, 2010

What will be the code when I try to make a combo box read only?

View 1 Replies

Read Only Property In Runtime?

Aug 12, 2011

How to declare property which can be modified in project mode but will be read only in runtime mode?

View 3 Replies

Error:Property Font Is Read-only?

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].....

View 2 Replies

Read Text Property Of Label From Another App?

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]

View 3 Replies

Override The Read Only Property Of User Control .OCX?

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.

View 6 Replies

VS 2008 Read Property Names From A Class In VB?

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]....

View 4 Replies

VS 2010 : Entity Framework - Specify Read Only Property?

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.

View 2 Replies

Cross-thread Calls To Read (only) A Control's Property

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]...

View 9 Replies

Get Sub To Address Appropriate Control / Can Set Its 'checked' Property Based On Text Read

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.

View 3 Replies

Read / Write Control Property Values That Has Been Saved As Ocx State Value In XML?

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.

View 1 Replies

Invalid Attempt To Call Read When Reader Is Closed (While OleDbDataReader.Read)

Sep 1, 2009

There are already multiple threads about this, but i don't have the knowledge about the different SQL databases/methods to make heads or tales from it.I am using an OleDbDataCommand, an OleDbDataReader and the following code

Dim Query2 As OleDb.OleDbCommand
Dim RetVal2 As OleDb.OleDbDataReader
Query2 = New OleDb.OleDbCommand("Select [section], [title], [id] From " & DtSections & " Where [volume] = " & volu & " And [chapter] = " & chapter & "", AccessConn)

[code]....

value)In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. Type) Object?

View 12 Replies

VS 2005 Read User Input Using Textbox But It Only Can Read Character And Numbers?

Jan 2, 2010

I know how to read user input using textbox but it only can read character and numbers. Is it possible that I want to read user input equation?

Example:

User type A+B
User put range of A and B.
1.25<A< 3.56
2.45<B< 9.87

I failed to read the equation using textbox. Is it there are other ways that can use to read equation input A+B?I am using VS2005 and VB.Net. I really new in this programming using VB.Net.

View 3 Replies

Comm Port Read Hangs When Attempting To Read Data?

Apr 18, 2010

I;m attempting to write code to read several NMEA ports and format the data for archive. When I execute the following code:

Using Commportno As IO.Ports.SerialPort = _
My.Computer.Ports.OpenSerialPort(portName:=port)
Dim Incoming As String = Commportno.ReadLine()

View 5 Replies

How To Read Numbers From A File Into A Variable To Be Be Used For A Function Then The Next Line To Be Read

Oct 24, 2009

I have created a program that saves the co-ordinates of the users mouse and saves it to a text file to be used as an auto clicker.

View 2 Replies

Read Text File And Stop Then How To Continue At The Last Read Point

Dec 15, 2009

I'm using vb.net 1.1 to develop the program. I got text files that contain test result from a machine, like below.

T1 1.24535 2.56335 2.43253 1.24538 2.55619 4.35243
T2 1.42542 1.63728 3.57295 4.59275 1.57320 2.72057
T3 5.12857 2.45375 6.38593 2.58375 3.57259 3.57204

I need to check the test result with the data from database, to find out which test result is failed. If there is a fail test result, I will show an alert to the operator and stop the checking process. Until the operator close the alert, then the checking process will continue from the last read point.

View 2 Replies

C# - Open A Read Only File As Non Read Only And Save/overwrite?

Sep 21, 2011

I have a number of word documents I am converting. Everything is going great until I get a file that is read only. In this case I get a Save As prompt.

Is there any way to open the file in read/write format? I should have admin privileges so access isn't an issue.

I'm using VB.net to open the files. More specifically

doc = word.Documents.Open(path, Type.Missing, False, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing)

View 2 Replies

Read MemoryStream - Load Image Byte And Read It?

Feb 21, 2012

ok i have image that i bind info in it and i want to read the info now from file (FileStream) its workbut i want to do it not from file so i need to use MemoryStreamhere the example that work and how i do it now how i make it work with MemoryStream (with byte = My.Resources or PictureBox1.image)

Using FS As New IO.FileStream(image, IO.FileMode.Open)
FS.Seek(0, IO.SeekOrigin.End)
While Not FS.ReadByte = Asc("|")

[code].....

View 1 Replies

Read Data (read Only) From Excel Files?

May 27, 2011

I want to read data (read only) from excel files

I use this connection string

Con_BarCode = New ADODB.Connection
With Con_BarCode
.ConnectionString = "Driver={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm,

[Code].....

View 1 Replies

VS 2010 Text File Read From Read Until?

Oct 3, 2009

I'm trying to make a program that can read .mp3 data (Such as Artist, Album, Year, Track number, etc), but I need to be able to do two things that I have no clue how to do:

1. Read starting from a specified string (E.G, On one line it states: [code]

2. Read until a specified string (E.G, On the previously stated line,I need to read starting from what I said, up until.

View 8 Replies

Read An XML Link And Storing It To Read?

Jul 20, 2009

Not sure if anyone has done this, but i'm making a game app and want to read a URL and store the info to read. The link outputs XML data, [url]...

Yes it is EVE If anyone could point me in the right direction to store the xml in vs2008 so i can start playing with it that would be awesome.

View 1 Replies

Read BMP That Not Have Header Of BMP And Trying To Read It With BMP Constructor

Jan 27, 2012

I am trying to Read BMP that not Have the Header of BMP and Trying to Read it with BMP Constructor, File is used for interface in a game, File structure is:The File structure is like this (Offset in decimal): [code]

View 16 Replies

Read XML File - Read The Data From ?

Feb 13, 2010

I have a fairly simple XML file that I just want to read the data from.

It has 3 levels, root, main section and items. There are no attributes. I want to go to the first main section by name, then read in all the items. The items all are named the same. I've seen this done before, so it should be ok. No writing will be done. Basically this is a static data file

File looks similar to the following:

CODE:

View 4 Replies

Read Text File - Read The Top Part First Then And Match The Line With Bottom Part

May 21, 2009

in my text file i have two part. Called bottom and top. So i need to read the Top part first then and match the line with bottom part. Its like this

[Code]...

View 5 Replies

Streamreader - Text File - To Read Into A Listview - Read From A Specific Line In That File

Mar 11, 2010

I have a txt file that I need to read into a listview, but I need to read from a specific line in that file. Below is a sample of the txt file to read,

6400,3200,2,95.5,84,76.6,0
1,2,-20,15,0,0,0,"NO",0,0
TOTAL GPM= 6400 HWT= 95.5 CWT= 84.0 IWBT= 76.6 ALTITUDE= 0

CODE]...

View 1 Replies

Changing Font Size & Bold - Get Property 'Size' Is Read Only?

Feb 27, 2009

I'm new to VB in Visual Studio 2008 and am just trying out some simple test.I just want to change the Font & Boldness of some text but get the following errorProperty 'Size' is Read onlyI have been browsing the forums and it seems that changing the font size etc isn't as simple as

TextBox.Font.Size = 12
TextBox.Font.Bold = True

Is this true, and if so what do I need to do

View 5 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved