Can The Initialization Order Of Class Fields In .NET Be Influenced By References To Other Fields
Jun 19, 2011
Class Foo
ReadOnly name As String
Public Sub New(name As String, dependentUpon As Foo)
Me.name = name
[code]....
The output of New Bar() is:
Dependent created. Dependent upon nothing.
Independent created. Dependent upon nothing.
It seems fields are initialized in the same order as they appear in the source code, which (a) leads to an unexpected result, and (b) seems a little puzzling, given that one is normally not permitted to read from uninitialized variables in .NET, yet that seems to be working fine above.I would've expected VB.NET to be smart enough to initialize referenced fields first, and only then those that reference it; i.e. I'd have liked to see this output instead:
Independent created. Dependent upon nothing.
Dependent created. Dependent upon Independent.
how to get VB.NET to behave like that instead, without simply having to swap the declaration order of dependent and independent inside class Bar?
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Nov 14, 2011
I'm currently refactoring an old Visual Basic DLL (VB.Net), which stores all of its data in one module called Globaldefinitions as public fields. There are about 200 fields, referenced thousands of times all around the code:
Public Module Globaldefinitons
Public a As Short
...
Public zz10 As Double
[Code]...
I need to change the module into a class with non-shared fields. This means, each and every of these thousands of references needs to reference the instance of that class:
globalDefinitionsInstance.a = 5
How do I go about this efficiently?
Regular expressions operating on the source fall flat. Refactoring tools like Re-Sharper or CodeRush don't seem to offer this functionality. Visual Studio 2010 cannot do it automatically either.
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May 27, 2012
I'm trying to create a table in Word using data from a table in Access. There are four fields in the access table that I need. 3 fields are text which I can populate the Word without any issues. However the fourth field is a memo with >255 characters.I'm struggling to come up with the proper code to allow me to populate the Word field with the memo data that has more than 255 characters. The code I have so far is listed below. But when it hits the memo field, it crashes on the line I marked with **. I know it's not text, but I've tried many different field types, but nothing has worked so far.[code]...
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Jan 14, 2012
My intent is to have the code - on a button.click event - check the Username and Password fields and return an error depending on which is wrong. Or if both are wrong, return a different error message. I've set the username as parts and the password as parts (still learning how to use external authentication). [Code]
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Dec 7, 2010
We need to specify a certain sort order for the fields of a class which is serialized to XML. sort order when dealing with XML elements but in our case there's a reason to do so.
So ... this answer for C# advises using XmlElementAttribute and I've translated the C# to VB as:
<System.Xml.Serialization.XmlElementAttribute(Order = 1)> _
Public Property Foo() As String
etcs
But it complains that Name 'Order 'is not declared. Have I mistranslated from C# or is there some other issue here?
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Aug 17, 2010
I have several sqldatasources for my gridview. All of the columns are autogenerated. However they all have some consistent fields and I'd like to make those fields template fields so I can modify the edit template for them such as adding a drop down menu. Is this possible?
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Sep 3, 2009
experience on how to create an engine using C# (VB.NET is okay too) that is generic enough to handle most cases of MS Word text fields I need to fill with data I'm getting from a database? In short, I'm about to embark on this little Office automation excursion and I'm hoping a little bit of feedback here.
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Nov 24, 2010
I have a class being populated from comma separated rows in a text file.I am trying to have the name property of each object appear in a listbox, then have the rest of the properties of a selected object show up in text boxes. How do I load the properties of the selected object to the correct textbox?
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Apr 8, 2012
I have a table which contains a list of products for a company. They input data about how much stock they have and also the level at which they want to be reminded that they need to order new stock.
[Code]...
I want to list all the true results in a form which the user is then able to navigate through. What would be the best way to go about doing this?
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May 8, 2009
I wanted to know what 'Fields' are in the Class Designer.
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Aug 2, 2010
Im builtina an windows application based on 3 tiers model. I have BLL, DAL, and UI Class. IN DAL I have SQL code, In BLL I have proprietie and methods .Im trying to validate the input fields on BLL class and no problem,and im just do it after SET instruction. I also PUT a message to view error. But From BLL class I want to put the focus in textfield that return error. I cant acess form proprieties (the forms are on UI class).
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Feb 13, 2012
how to execute this SQL Statement
Scenario:
Given Tables T_Data, T_AllDesc, T_System1, T_System2
Given Fields:
T_Data= f_id, f_Desc, f_CreationDate, f_CreationTime, f_System1, f_System2
[Code].....
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Jan 12, 2012
In my first attempt to create a Class that contains something useful (if you will), I am a little lost what a sound way to proceed is. I am trying to make a table that has fields and records. Perhaps imagine a tiny spreadsheet. So, I create my Class. Properties might include the number of columns, the column titles, and the number of rows or records. I then think the thing to do is create a couple of structures to be used within the class. Thus far I have this:
Imports System.Console
Public Class ConsoleTable
Property NumberofCOlumns As Int32
[Code]....
Problems I am creating in my mind include:
1) In the Field Structure, could I make the FieldValue so that I can change the data type? Meaning sometimes I want an instance of a Field to hold a string,or an integer, or a decimal.
2) In the Record structure, for any given instance of one I don't know the number of fields it will hold until I create the new instance. I tried Public RecordFields(FieldCount) As Field in the Structure, but that's not allowed.
I then used Public RecordFields() As Field, and then in my code used the ReDim method. Is there a better way?
3) With the Table Class, same problem. The number of records within any instance of the class needs to be dynamic.
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Mar 21, 2012
I have a class (using a class rather than a structure only because I can set a default field value for the fields I declare in the class) and I'm using a web service that returns information (demographic information) in JSON. I am using LINQ to get the values of each "entry" from the returned list and in that, I have to parse through and pull out the actual data that I want.Here's how I have it doing right now (just a start, there are 44 of them total, thus my question which will follow the code):
Dim returnedStats = From ljo As Linq.JObject In returnedObject.SelectToken("results")
'
'
For Each stat As Linq.JObject In returnedStats
[code]....
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Mar 21, 2011
Suppose I want to build a class like
Class MyClass inherit Something
Dim A as string Bim B as integer
End Class When I am writing code, and i want to use thesenew properties or fields, the intellisense shows me the new properties and fields mixed with those inherited. Is there a way to show them all grouped togheter separated from those inherited ( a part giving them a common prefix in the name)?
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Nov 12, 2010
I am trying to implement transactions across multiple TableAdapters in VB.NET (using Visual Studio 2010) by extending the partial class as described in the following examples:
http://blah.winsmarts.com/2006/06/18/the-definitive-tableadapters--transactions-blog-post.aspx
madprops.org/blog/typed-datasets-and-sqltransaction/
stackoverflow.com/questions/2342289/net-tableadapter-to-dataadapter
However, when I attempt to expose any of the private fields created by the designer they are underlined in the editor with the following error:
'_adapter' is not declared. It may be inaccessible due to its protection
level.
Searching this site as well as google has not revealed anything useful, but perhpas I'm searching the wrong keywords.
Here is the code in MyDataset.vb
Partial Public Class MyTableAdapter
Public Property MyTransaction() As SqlTransaction
Get
[code]....
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Apr 22, 2010
I've got a BaseDataClass with shared fields and functions
CODE:
I have several classes that derive from this base class. The derived classes have all Shared functions that can be called directly from the BLL with no instantiation. The functions in these derived classes call the base Init(), call their specific stored procs, call the base CleanAll() and then return the results.
So if I have 5 derived classes with 10 functions each, totaling 50 possible function calls, since they are all Shared, the CLR only calls one at a time, right? All calls are queued to wait until each Shared function completes.
Is there a better design with having Shared functions in your DAL and still have base class functions? Or since I have a base class, is it better to move towards instance methods within the DAL?
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Apr 16, 2009
I have a solution made up of several projects. Everything is properly referenced, the solution builds and runs. Now, when "view class diagram" for this class, it doesn't show any fields. It shows "dmxProgram" as a property, but it doesn't show any of the non-property private fields. Therefore I can't add associations to my class diagram for those fields that do not appear.
[Code]...
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Aug 2, 2010
Let say I have a function inside a class which require 4 parameter (table name,field name,field value, return field) When I use this function my form, such as
myclass.Search("customers", <-- after pressing the "," a popup list will be displayed that contain all the fields in "customers" table.
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Nov 11, 2011
if I put controls on form1 like button,textbox....etcwhy called this control fields not object in the class diagram ?
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Apr 2, 2012
I have a base class:
public class foo
public sub new(byref bar as foobar)
end class
and a subclass
[CODE]...
My question is: In the derived class, I have lots of fields defined. What's the prefered style? Put 'em after my "new" sub or before?
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Nov 3, 2011
I have main class of Races with mulitple properties. One of those properties has been defined as another class Runners.
So I have a race with multiple runners and when I try to update the data i get an instantiation error.
For the life of me I can't get it to work.
This is what I am trying to do...
In the clsRace class I have defined :
PublicProperty clsRunner(ByVal index AsLong) As clsRunner
Get
[Code].....
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May 11, 2009
i want to create an anonymous class in vb.net exactly like this:
[Code]...
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Nov 4, 2011
Whats the difference between these two initialization methods for obj? I've seen both of these, but know know if there is an appropriate time to use one vs the other. I found this post which covers C#, but not sure if the same applies to VB.Net.[code]
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Apr 6, 2009
When starting my application, I have a couple of classes which are required to read certain files in order to create a set of default data. The logical place (to me) to do this is in a Shared class constructor; the idea would be to throw a class-level event if the reading of the defaults file fails. Unfortunately, this does not work as attempting to access such an event, in order to attach a handler to it, fires the class constructor before the event has been attached. In a failing case, the constructor starts, fires the fail event, the constructor completes, and then the event handler is attached, after the event has fired.
The only other solution I can think of is to give the class a "typeInitialisedSuccessfully" boolean property and put a try/catch block around every call to construct an instance of the class, which seems unnecessarily kludgey to me. Can someone suggest a more elegant solution?
EDIT: Because this is a fundamental Class, used in one form or another across nearly all of our software tools, I would greatly prefer a solution that will notify future programmers that the type initialiser needs to be called, which is why I initially went towards the Shared Constructor as a solution.
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Feb 13, 2010
I'm creating a Process Control application that will save various data fields to SQL Server 2005. Part of the data will be input via a VB hand-held application which was created on the CE 5.0 - we are running VB.NET 2.0 on Visual Studio 2005. The rest of the data will be collected via plant equipment which will interface will PLCs on the production floor. There are approximately 25 different attributes which will be stored in a SQL server table.
The user wants me to create 3 alert levels that will involve:
1) Checking to see IF a reading was manually input.
2) Checking to see if the value passed or failed.
The FIRST alert involves notifying the operator via the hand-held or some other technique. The SECOND alert involves checking back after a set time interval (15 minutes, 30 minutes, etc.) to see if the attribute passed or failed and then taking a higher action - such as an email, text message or phone call to a higher level manager. If the second check fails, the same escalation process continues with the THIRD alert level - and another action takes place such as a message being sent to yet a higher level manager.
Presumably, once the status check passes, the alert level is re-set back to 0. But I'm thinking that the process that checks for the failed attributes will need to continue to run in the background - probably at set intervals. I'm not sure if the functionality for this is something that would be best handled by VB.NET or SQL Server...
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Jan 5, 2011
I have two money fields in a SQL database called TotalClaimed and PartialSettlementAmountRecd.They are declared as Decimals like so:
Public PartialSettlementAmountRecd As Decimal
Public TotalClaimed As Decimal
They both output the repsective amounts perfectly. I need to do a calculation on them, by subtracting PartialSettlementAmountRecd from TotalClaimed. I have tried the following, but it just outputs a random number, not the amount I require.
Dim NewSettAmount As Decimal = (ClaimDetail.TotalClaimed) - (ClaimDetail.PartialSettlementAmountRecd)
Response.Write("New Settlement Amount: £" & NewSettAmount)
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Aug 5, 2009
I have the aplication which requires name fields... and i wan tto clear these fields whenever i closed the application using close(X) button. i dont want to use 'clear' button.
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Nov 1, 2011
I have a code that I found as a VBS and ported it to VBA and works perfectly, but I am now trying to run on VB.NET 2010 but am getting a Path not found error. I am trying to get the complete name and e-mail from the Acitive Directory from the current user.[code]
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Mar 17, 2011
I have a function that writes value of dynamic textboxes (quantity & price) and their sum (value) into sql db, all in other column. Now there multiple entrys for the sam user (ID). Now I would like to know how can I get the sum of the value3 fields in the db to the vb.net form?
this is my code:
Dim kol As String = ""
Dim cena As String = ""
Dim znesek As String = ""
[Code]......
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