C# - The Cost Of Finalize In .Net?
Jun 15, 2010
(1) I've read a lot of questions about IDisposable where the answers recommend not using Finalize unless you really need to because of the process time involved.What I haven't seen is how much this cost is and how often it's paid. Every millisecond? second? hour, day etc.
(2) Also, it seems to me that Finalize is handy when its not always known if an object can be disposed. For instance, the framework font class. A control can't dispose of it because it doesn't know if the font is shared. The font is usually created at design time so the user won't know to dispose it, therefore finalize kicks in to finally get rid of it when there are no references left. Is that a correct impression?
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Sep 17, 2010
I am running into trouble with some code I am doing for an assignment. The section within the apostrophes (If Then Else) is the section that I am having trouble with. When the user selects a seat type and then clicks the compute button, the wrong cost is displayed instead of an accurate cost.
Option Strict On
Public Class frmTickets
Private Sub btnComputeCost_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnComputeCost.Click
Dim intNumberOfTickets As Integer
[CODE]....................
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Jun 7, 2010
How do I code the total cost to give me a pound sign with the total cost at the moment when the total comes up for an example it gives me 3.6 when I need it to show £3.60 here is the code I have so far. [code]
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Jan 25, 2010
when i call GC.ReRegisterForFinalize(obj) and changed my mind, i could call GC.SuppressFinalize(obj) and remove it from the list of object that requests finalization. problem is that when i call GC.ReRegisterForFinalize(obj) twice, it registers the object twice in the finalization-listing. i need to remove the object from the finalization-listing but multiple calls of GC.SuppressFinalize(obj) could not remove obj from the list.also, why is it acceptable for this function to be called SuppresFinalize when after calling it Finalize still occurs?
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Feb 15, 2010
Class ComponentsContainer ' a component contains other components'
Inherits System.ComponentModel.Component
Private foo as New Component
Private bar as New Component
Protected Override Sub Finalize()
foo.Dispose() ' HERE ? '
bar.Dispose()
MyBase.Finalize()
End Sub
Protected Overrides Sub Dispose(disposing As Boolean)
[Code]...
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Apr 20, 2009
I'm looking at some vb.net code I just inherited, and cannot fathom why the original developer would do this.
Basically, each "Domain" class is a collection of properties. And each one implements IDisposable.Dispose, and overrides Finalize(). There is no base class, so each just extents Object.
Dispose sets each private var to Nothing, or calls _private.Dispose when the property is another domain object. There's a private var that tracks the disposed state, and the final thing in Dispose is GC.suppressFinalize(Me)
Finalize just calls Me.Dispose and MyBase.Finalize.
There are no un-managed resources, no db connections, nothing that would seem to need this.
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Mar 21, 2012
I have a logging class that stores entries in a datatable dt. I then use SQLBULKCOPY to write that dt out to a sql table. Basic stuff. Problem is, I'd like to only call SQLBULKCOPY when there's say 50 entries in the dt. The problem is, what if I'm done (either intentionally or not, like if the code block that's using the log class throws an exception) with the logging object and there are still 15 rows in the dt?
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Apr 21, 2011
Is there a way to Finalize() or Dispose() a Module in VB.NET? Have a situation similar to the following and need to Dispose() itsUnManagedObject.[code]...
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Dec 24, 2009
how do we implement Finalize to remove an object?i tried this:
Public Sub kill()
Me.Finalize()
End Sub
then this:
Dim g = New Test
g.kill()
MsgBox(g.ToString)
weird the object still exists, i don't get a NullReferencePointer exception
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Apr 20, 2009
I am comparing an alternative Dispose pattern to VS2005's default implementation. In doing the comparison I have found several uncertainties with the default pattern which have raised a handful of questions related to sub-class implementations and object Finalization.
[Code]...
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May 4, 2010
why does finalize not get fired when i try to destroy a class until the application is exiting. i feel like because these objects were never actually finalized until the program is exiting that its somehow bogging down the operation of my app VS 2008?
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Jul 5, 2011
Useless question I guess, but accessing the property DateAndTime.Now computes each time the current system date and time, I suppose, is that right?
[Code]...
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Mar 14, 2010
I need to know basic compiter skills,abbreviations ,what is aC++ and so oncan I get that here or would I be better off at a Technical school?
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Apr 27, 2011
I'm making a control and I am trying to finalize my design time properties grid. I have several List(of Class) items as public properties and when I click on the design time menu (while testing the control) there is the word "Collection" and a button with an ellipsis (...) that brings up a neat pop up with the buttons Add/remove and all of the public properties of the collection's class on the right hand side. Basically for a non-collection instance of a class (with public properties) I'd like a similar button to show up. I know I could put all of the properties in the main control class and group them, but I like the pop up box feature. Anyway to duplicate this? (think font grid item etc.)
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Oct 29, 2009
below is the code I am working on. It is for a hospital cost form.
[code..]
I have a working version, but it doesn't meet the requirements completley.(I can post that if you need to see it) I am redoing this project and I am so stressed out. I may be overlooking something!
[code..]
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May 27, 2010
I am trying to calculate a total cost from an elapsed time. Dependant on how long the time is, this will calculate the total cost. It has to be 3 to every hour. The elapsed time is displayed in label6 in "hh:MM:ss" format and the total cost needs to be displayed in label8.
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Jun 15, 2012
I am creating a code for a school project that calculates the shipping cost for a package. In this program the user enters the weight of the package ( in pounds ) and selects the destination of the package. The application with determine the cost of the shipping. The destination of the package can be the US continental, Hawaii or Alaska. If the package is going to Hawaii a 20% surcharge is added to the shipping cost. If the package is going to Alaska, a 26% surcharge is added the shipping cost.
This is my code thus far. When applying my weight in pounds and selecting the destination I still keep getting 0.0 for the total.
Public Class Form1
Private Sub textboxpounds_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles textboxpounds.TextChanged
End Sub
Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)[Code] .....
Here is a screenshot of the GUI
Uploaded with ImageShack.us
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Nov 4, 2010
Our company has relied heavily on COM+ components to centralize our DAL code and take advantage of the ability of COM+ to handle transactions and connection pooling. When we started using COM+, it was just with VB6 DLLs and always through late-binding so we could take advantage of DLLs being hosted on a different server.When we started moving to .NET in 2005, we ported our DAL functionality to .NET and continued to use COM+ and late binding to host the components. We would instantiate the objects like so: objBalLauncher = CreateObject("NETBLL.Launcher", "\" &strCOMPlusServer Name)I noticed that CreateObject seems to be for ActiveX COM components, so this has me thinking about two things:If COM+ was designed for unmanaged components, is there a cost to using COM+ with managed .NET DLLs?Is there a cost to using CreateObject() to late-bind to an assembly from within .NET code? Does this force your code to cross the managed/unmanaged barrier to communicate with the DLL? While I would be interested in hearing about alternatives to COM+ (which I'm sure are available by now), I'm most interested in hearing about what expense I incur from using managed DLLs within COM+.
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Mar 30, 2010
I'm have successfully did a shortcut "+" and "-" button to increase and decrease the qty ordered. But by doing so, i now have problem tabulating the cost for each item. Below is the print screen for my application. You will realised that the Lamb tandoori which is going for $3 cost only $21 after increasing the quantity ordered using the "+" button.In addition, i have created different list boxes for different food categories.Each category's food items is selling at the same price.
<img src "http://img521.imageshack.us/img521/6144/prob.png" />
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Jan 15, 2012
When i run the program and click the cost button, it only returns a value of £0.00 for insurance cost and total cost.
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCost.Click
Dim Cost As Double
[Code]......
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Mar 7, 2010
My project, is something that could be used by an opticians (well in theory anyway)I have a customer being selected, eye measurements etc..Then I can enter in data (into textboxes):
TextBox1. Frames Stock: #12345
TextBox2. Material Used: Glass / Plastic
TextBox3. UV Filter: Yes / No
[code].....
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Apr 17, 2010
I was trying to make a calculator which takes the amont of copies you want to make and it tells you the cost. Then you type in the amount you want to enter and if its less a message box comes up saying "please enter more money". I've had a few problems
1. when i use formatcurrency the program crashes for no apparent reason
2. if i calculate cost without entering any copies then it crashes (ive tried putting a msgbox in but it crashes anyway)
3. if i get the msgbox to come up saying "Please enter more money" i had to remove the formatcorrency tag.
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Jun 21, 2010
I have a class assignment where i have to calculate the total cost of a parking garage from hours but i have to do it with a method function. So this might be a stupid question but can you read the user input values from a textbox in the function itself or do they have to be read in and recalled from the Private Sub Button1_Click section?
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May 31, 2010
I have a assignment and I have got to do the total cost and put the total in a label, here is the code. Select Case pizza1
[Code]...
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Apr 26, 2011
Create an application that calculates the total cost of a stay in a hotel in the North Carolina mountains. The application should accept the following in terms of input:Month of Check in Length of Stay (in Nights) Number of Persons Room Service Charges Phone Charges Other Charges If the check in occurs in November-March the rate is $89/night. April-August is $99/night and September-October is $109/night. $10/night should be added if more than 2 people are in the room. More than 4 people are not allowed in the room, and a traveler can only request 1 room. A 15% tax should be added to the room rate and 10% tax added to all room service and other charges. No tax will be added for phone charges.
The program should use a function to calculate the total charges for the visitor's stay and output it to a label. There should be buttons or menus to calculate the total, clear the form, and exit the application.At least one of the button should call a sub procedure which performs its function. I don't understand how to set this program up and I'm not sure what it means.
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Mar 3, 2010
I certainly hope I don't aggravate you with what is certainly a very simple code problem. I have never programmed before, but I do have a background in tech support, etc. I have an assignment to do and it's frustrating to wade through the information out there to find exactly what I need and nothing more.The assignment has 3 parts, one of which i've done. We are to do the same function in both javascript and VB. I was able to take a sample we did in class that caluclates a 10% discount and modify it so it calculates the total. Now, I have to modify that into a VB sln file. then write about the differences but that part will be cake.
I am working in Visual Studio 2008 - that program is new to me as well. When I created my login and it asked what VB I'm using, I did not know but under theu of VS, it says VB 2008.hat I attempted to do was to take the instructor's sample discount code and modify it for the new purpose, but an error was generated. This is the sample code I started with:
'Programmer: Dan Dougherty
'Date: Feb 2010
'
[code].....
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Aug 4, 2011
How to update the total cost after every item is selected and the user clicks enter...
Private Sub calcbutton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles calcbutton.Click
Dim amount As Double
Double.TryParse(amounttextbox.Text, amount)
Dim total As Double
[Code] .....
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Feb 19, 2012
I'm trying to calculate the total cost for gas for a Chevy and a Buick on a form. The total miles is 21 for city and 33 for freeway. I'm also putting in the mpg for each, for city and freeway. How would I set up the labels to display the right amount? Do I use If Then statements?
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Nov 14, 2009
I am having a problem linking the two other mods. I can't seem to be able to link CalcMiscCharges and CalcTotalCharges. I realize that I have just the CalcDayCharge being displayed. I am not getting any kind of errors, as of now.
Public Class frmHospitalStay
'Clears the form.
Private Sub btnClearForm_Click(ByVal sender As System.Object, ByVal e As
[CODE]...
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Feb 23, 2009
I'm using FedEx for my shipment and use the FedEx rate calculator to find the shipping cost. When I send the request and get back the response, I always find that there is no discount applied even if i send a quantity of 100. following questions so that i can get clear with how to work with the fedex webservice
1. If i want to send 2 quantities of a product. will i be constructing the request with a package count as 2 and repeating the same <requestedpackage> twice ?
[Code]...
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