Call Dispose With Regions?
Jun 22, 2011
When you set a region equal to another, or set it equal to a new instance, do you have to call dispose on the region, or does VB do that? (I guess this isn't necessarily specific to regions)
ex:
'at some point in the code a region is created
Dim Rgn as New Region(SomeRect)
'....
[Code].....
If Rgn now points to the Rgns(0) clone, what happens to the original memory created by "New Region(SomeRect)"? Do I need to call dispose on Rgn before assigning it to the the Rgns(0) clone?
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May 14, 2010
Should I call .Dispose() after returning an object that implements IDisposable? [code]In other words, is the object I return a copy, or is it the object itself?
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Sep 16, 2009
In my Zeal to get with the "Dispose" program, I implement a dispose pattern (still learning the ways and means of THAT) wherever it seems to make sense.I THINK I have the basic idea. However, I notice that, while Drawing.Brushes HAVE a Dispose method, when I call it, some sort of instability is created in Visual Studio itself, and i get the dreaded "Visual Studio has encountered an error and needs to close" splash screen, with no useable error information. SHould I assume that one should just NOT call dispose on Brush objects, or is there something I am missing here: [code]
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Jul 22, 2010
say you have a sub containing an io.streamwriter. That streamwriter is declared and used only inside that sub (and not as static). Should you still call dispose on that streamwriter or is it disposed automatically as it is no longer in use after that sub, until you call that sub again?
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Oct 14, 2009
I have 2 question, hope somebody give me an explanation: 1. Should a local variable call dispose method and set to nothing? 2. If some method have an arguments which it is a ByVal argument, it means a method create a new object? But If it is a ByRef argument, it means a method don't create a new object?
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Aug 31, 2009
I am having trouble understanding the proper implementation of Dispose. While I totally understand the IDEA behind it (Ensuring that variable references to objects are released and free to be GC'd), I am not sure I am doing this properly.I try to call dispose on all items delcalred and used within a procedural scope when I am done with them (or even better, employ a Using block).When I declare Class-level items, I assume I should call dispose on them prior to destroying the class (During the "Disposed" event, right? which will occur when "Dispose" is called on my class?).As Declared in Class-level Declarations:
Public Class MyDisposableClass
Implements IDisposable
Protected mImgExpand As Image = My.Resources.ListCollapsePNG9x9_DK[code]........
When THIS class is instantiated within another class (Say, a form),I call "Dispose" on THie instance of this class during the form's "Close" Event. Everything seems to work fine. However,when I step through the code, things seem to go in a circle. We go from the close event, which calls dispose on the class instance, to the class instance dispose event, then back to the parent class disposed event, etc.
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Nov 12, 2009
Does calling the Dispose method on a Windows.Forms.Timer call it's Stop method? Or should I stop the timer before I dispose it?
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Jun 25, 2012
I looked at the Dispose() method in System.Data.SqlClient.SqlTransaction (using a decompiler):
[Code]....
Why does everyone say in forums that it is Rolling back in the dispose? Where does it rollback?
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Aug 13, 2010
I'm getting an error when changing a picturebox region in a timer_tick event.
[code]....
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Jun 23, 2010
I know i can collapse all regions with Ctrl+M, Ctrl+O - but that also collapses all of the subs/functions/properties etc within the #Region.if it collapsed all of the sub regions too - just not the subs etc.Is there a way to collapse all top level regions only? Maybe an extension?
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Oct 30, 2010
I always get worried and my layout when i code. I always get myself in a flap when coding and worried i should be doing it different.What i am going on about is not the code it self. But where i actually put the code.
What i am thinking about is functionality (does it matter if formload code is at top/bottom/ or even middle)
And read ability. Do i put all button events into regions?
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Nov 3, 2010
In my IDE #Region statement are left justified by the auto outlining tool. I think this is ugly. Is there anyway to make #Regions have standard indentions? I am using Visual studio 2008 version 9.0. See code block below for an example.
[Code]...
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Jun 30, 2010
I'm refactoring VB.NET code where methods routinely run five hundred lines and the references are so tightly coupled that the code defies simple refactoring such as method extraction. And that's why I thought I would try regions within a method body. I just wanted to organize the code for the short term. But the IDE didn't let me (resulted in a compiler error.) I'm just curious as to why? Seems like code regions shouldn't impact the compiler, intellisense etc. Am I missing something? (Still using VS 2005 btw.)
Interesting: This seems to be language specific. It's OK in C# (I didn't check that initially) but not in VB.NET.
public module MyModule
Sub RunSnippet()
dim a as A = new A (Int32.MaxValue )
[code]....
that gets a compiler error but the C# version is ok.
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Oct 4, 2010
I would like to create an interface that brings with it it's own private variables and regions.for example, if you create a class and implement IDisposable, you get all of the following:[code]
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Feb 5, 2012
I've been having several problems lately with clients that are using a different Windows Region setting than I am. The error is as follows:
The type initializer for 'InventoryDataTable' threw an exception. ---> System.TypeInitializationException: The type initializer for 'InventoryDataTable' threw an exception. ---> System.FormatException: String was not recognized as a valid DateTime.
The error occurs when users load the application and their region settings do not match my own. The application loads up a dataset and attempts to receive a small amount of data before allowing the user to log in. When this is removed, the problem occurs immediately after the user logs in to the app. I cannot seem to find the proper settings to force the user to use either my Region, or to allow the application to figure it out on it's own...
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Jul 9, 2009
In Visual Studio C# (2008) ctl-M-L expand all the regions. There's also a setting in Text Editor->C# ->Advanced to not collapse during file open. I see no equivalents in VB.NET.Is there a way to expand all the regions, not just the one which has focus in VB.NET.
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Mar 10, 2011
it is possible to make the collapsible markers(-) or (+) for collapsed sections/regions larger.VS 2010 Pro.
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May 17, 2011
I connected to the Informix server using RazorSQL, created a stored procedure and tested it, getting the expected answer, so the procedure exists in the database in some form.
I then run the following code:
If ConnectToInformix() Then
Dim cmd As New IfxCommand("dc_routeHasOutstandingQuantity", conn)
cmd.CommandType = CommandType.StoredProcedure
[Code]....
This error does not occur when calling the stored procedure from a live SQL connection.
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Sep 27, 2009
Ho to use xxx.DISPOSE() under VB.net
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Oct 13, 2009
I have a program, and there is a timer to run it every 15 minutes. Every time it run, it will create a new exe / thread, (I monitor this thru an external software called TCPView). With the thread growing, it may slow down the performance, is there a way to dispose the thread before a new one is created?
Private Sub Processing()
Dim tmrThreadingTimer As Threading.Timer
Try
[code]....
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Mar 22, 2012
I want to create an ExpressionTree where a Func(of Vector, Vector, Vector, Vector, Double, Double, Vektor) should be called. So I use
Expression.Call(Forces(0).Function.Method, {Vec1, Vec2, Vec3, Vec4, Double1, Double2})(Vec1-4, Double1-2 are declared as ParameterExpression and Forces(0).Function as Func(of Vector, Vector, Vector, Vector, Double, Double, Vector). But I get an AgrumentException, because Forces(0).Function.Method has seven Arguments. (System.Runtime.CompilerServices.Closure as seventh argument at Index 0).
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May 13, 2011
I am having fun working with System.Threading.Tasks. Many of the code samples I see, however, look something like so:
Dim lcTask = Task.Factory.StartNew(Sub() DoSomeWork())
Dim lcTaskLong = Task.Factory.StartNew(Sub() DoSomeWork(), TaskCreationOptions.LongRunning)
Task.WaitAll(lcTask, lcTaskLong)
That's the extent of the sample.Tasks implement IDisposable, so obviously I'm supposed to dispose of them, but what if I just want to "Fire and Forget"?If I don't dispose, will I leak threads/handles/memory/karma?Am I using tasks "wrong"? (Should just use a delegate and leave tasks alone?)
Can I dispose in a "ContinueWith()"? (That seems like playing Russian Roulette.)[URL]..
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Jan 28, 2009
When is it appropriate to apply the dispose method to controls?For example in a form that has five group boxes, once the first group box is used to gather user entries and is no longer needed, is it worth it to apply the dispose method to the first group box? Is it needed for local variables, for example a StringBuilder used within a private function which is only used while the function is executing?
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Mar 1, 2011
[Code]...
Here I am Clear the object using Dispose( Mycmd.Dispose()). Can I Use here Nothing ( Mycmd = Nothing?. Which is the Best ?
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Sep 21, 2009
I attempting to dispose / close a startup form from a sub. Basically, I using the filesystemwatcher to watch for file creation, if the file is created, run some code and close the form.how to pass in some reference form. Using and new to vs2008. A bit of leap from VB 6.0.
Imports System.IO
Public watchfolder As System.IO.FileSystemWatcher
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code]....
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Dec 11, 2010
Hello, I have a WPF Window that I show with Window.Show(). When I click X the form closes. But it is still in memory and the GC never comes and cleans it up. Also I do not have any refrences/handles to it.
I am using the following code with the window:
Code:
Public Class PageWindow
Implements System.IDisposable
Public UserPressedExit As Boolean
[Code]....
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Jan 7, 2010
I was experimenting with ways to get rid of some memory leaks within my application the other day when I realized that I know virtually nothing about cleaning up my resources. I did some research, and hoped that just calling the .dispose() would solve all of my problems. We have a table in our database that contains about 65,000 records. Obviously when I fill my dataset from the dataadapter, the memory usage can get pretty high. When I called the dispose method on the dataset, I was surprised to find out that NONE of the memory got released.
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Jul 22, 2010
Out of pure curiosity, is there a way to free the memory used by a StringBuilder, other than the obvious MyBuilder = New StringBuilder and MyBuilder.Remove(0, Length) (although I guess the later wouldn't free anything, would it?)
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Jan 2, 2012
I create class as Person and include a public sub Insert_DB I write down this code in form
vb
Dim MyPerson As New Person MyPerson.Insert_DB(Me.TextBox1.Text, Me.TextBox2.Text, Me.TextBox3.Text)
I tried to set Dispose to MyPerson (MyPerson.Dispose)but didn't show me Dispose
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Feb 12, 2012
hi everyone i created a thumbnail dll for my file type my class dll create thumb for my files type but my class no dispose after create thumbnail this is my project : HPTShellExtThumbnailHandler.rar
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