Testing The State Of A Mutex Without Calling WaitOne
May 4, 2011
Is there a way to do a read-only test of the blocking state of a mutex? Currently I use the return value of WaitOne(0,False). This works fine, provided that if the return is true, I also call ReleaseMutex. Failing to do this, my test would corrupt the state of the mutex. So, the test is effective, but it has the irritating side effect of two state changes in the mutex. In addition, WaitOne and ReleaseMutex can throw exceptions and that further complicates matters. If WaitOne is successful and returns true, and if ReleaseMutex throws an exception, I can't clean up the mess that I have made.
I'm looking into adding some unit tests for some classes in my data access layer and I'm looking at an update routine that has no return value.It simply updates a row based on the id you provide at whichever column name you provide.Inside of this method, we collect the parameters and pass them to a helper routine which calls the stored procedure to update the table.Is there a recommended approach for how to do unit testing in such a scenario?
I use VS team system 2008. At the moment i need to test some business classes, i have found two kinds testing NUnit and the unit testing provided by the VS team system. what are there differences?
i've got a Set and a Get in a property. I want to allow multiple threads to do Get anytime they wish to, however if any thread tries to do Set, all threads must not be able to Get/Set until the Set is complete.[code]the problem is that this is pretty inefficient because each request to Get will steal the Mutex and prevent other Gets until the stolen Mutex is Released. Is there anyway to just check if a Mutex is released instead of using WaitOne because WaitOne checks and gains control of the Mutex which is not what i want
My application is very very speed esential and even a microsecond matters.I am using semaphore(1,1) at varios places. I think it can be easily converted into mutex.But I want to know if it will be advantageous or its one and the same thing as far as speed is concerned.
I'm building an Active Directory wrapper in VBNET 2.0 (can't use later .NET) in which I have the following:
IUtilisateur IGroupe IUniteOrganisation
These interfaces are implemented in internal classes (Friend in VBNET), so that I want to implement a façade in order to instiate each of the interfaces with their internal classes. This will allow the architecture a better flexibility, etc.Now, I want to test these classes (Utilisateur, Groupe, UniteOrganisation) in a different project within the same solution. However, these classes are internal. I would like to be able to instantiate them without going through my façade, but only for these tests, nothing more.
I'm trying to implement single instance application using mutex.the application can run only one instance from a given directory.i tried to implement it in Applicationsevents class but it's not working.I replicated it with a test harness with a single form.my ApplicationEvents.vb code:
Private Sub SingleInstanceCheck(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs) Handles Me.Startup Dim strLoc As String = Assembly.GetExecutingAssembly().Location
[code]....
it runs multiple instances.Things I am not able change:
1.project setting has "Enable Application framework" ticked
2. ApplicationEvents.vb handles UnhandleException which means i cant have a module as startup.
In my project developed for using asp.net with vb.net coding. Now we need to performace testing using the Jmeter tool. we can't able to test because in my application lot of session variable used, Jmeter tool does not support session variables i think.Check with debugging:1.Assign the session(userName) ="abc" then goes to next page, then check value same session vaule as nothing.
I have a Do loop that I want to exit once it goes through without making any changes to an object I created. I figured the best way to do this was to create a temporary copy of the object at the beginning of the loop and then compare that to the actual object at the end of the loop to determine whether any changes were made to it. The problem occurs when variables are accessed and copied by reference. I have tried to use some of the methods such as .Clone and .Equals (maybe I shouldn't be using these, but I didn't see any better built-in methods), but I seem to be doing some stuff wrong. Can somebody give me an example of a good way to copy an object for later equality testing, and how to do the equality testing?
I was once a VB 6 expert, but it's been a while.I am attempting to create a simple DLL in VB. I created a new WCF Service Library, which is what it looks like I needed to do. I filled out the interface and implemented it. Here's the interface:
<ServiceContract()> Public Interface AgileApi <OperationContract()>
[code]....
And attempted to call it, but I get System.EntryPointNotFoundException. I've tried pathing the defined library and copying the dll file into the same place where my EXE is, but no change to the error.
I'm writing a piece of code to manage the Unhandled exceptions in my VB application.
I'm using the following code
Partial Friend Class MyApplication Private Sub MyApplication_UnhandledException(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.UnhandledExceptionEventArgs) Handles
I'm trying to determine if a file "G:myfilesfile1.txt" exists. Using sample code from numerous web searches I can't make any of the FileSystemObjects work. Seems to me the FSO routines are an add-in to VB. If this is so, how do I add them in?
In noncode, this is what I really want to do:
if "file1.txt" exists AND "file2.txt" exists if "file1.txt" filedate > "file2.txt" filedate copy "file2.txt" to "fileold.txt"
when I try to test for a null value using the following:
If not string.isnullorempty(trvlitreadservice.itineraryinfo.reservationitems(zbook).value) then .........
I get an error as soon as it hits a null value. I thought this was supposed to test for a null value yet it throws an error for the very thing I'm testing for.
Private Sub CompareTime3() Dim NowTime3 As Date Nowtime3 = (TimeOfDay)
[code].....
In each of the two test sub routines, both if-then statements end up as true and I get both messages boxes displayed ("Timeslot is 16" then "Timeslot is 40" are displayed. One comaprison is AM the other is PM. How can one variable be true for both?
When i try to run my unit tests in vb.net, visual studio closes down because of an error.I don't know what is causing the problem but i is very frustrating.I have a project running for school that i can't continue because of this problem.When i had visual studio installed under windows vista i didn't got that problem. (same version of visual studio)
We have a DateTime Service that pulls the Database date down when we need to use a Date. Now, If I want to run a test using "Todays" Date using FitNesse, What would be the easiest way of creating a way to have (OurService).CurrentDate be static? We have a control that ads Days,Years, or Months to the current date.. and I would like to be able to test this.
I have been assigned a task of exploring unit testing using tools available in the market.My question is how do i write an API that would help in writing unit test cases.Example i can use nunit to write something like this to check whether file exists in the given location.
<Test()> _ Public Sub CheckOutputFileInfo() ReportPath = "D:temp est.txt"
i need to learn how to do automated testing using visual basic. i already know little bit about visual basic. now how can i do automated testing using vb.any good resource to study about that? even if it a link based resource also fine. and i need your suggestion on how to carry on with testing in visual basic and how to do it well. waiting for your reply.
In the project that i;m currently working on i;m not allowed to touch GUI for anyreason that includes program testing. I'm in bit of s frustration becuase prior to this all must application were developed and tested using GUI. Typicvally it wold take a me a week to develop an app now it taking more than that. Especially the TDD with Unit testing. The documentation kills more time too......
how can I test if a dataset has rows? I'm trying to see if my sql procedure call managed to fill up my dataset.Also, is there an easy way to print the rows to a label?
I am responsible for rewriting an internal tool for my company. I am currently reworking the most time consuming step to run faster which should give me time to re-think the design of the application for a full rewrite as the interstitial version will meet the current needs. I really want to take this opportunity to implement this code using BDD/TDD but I am new to this method of programming in general and especially within the context of .NET. Are there BDD/TDD tools available for .NET? What resources should I look at?
I often get calls from a friend of mine's company saying "ahhh our email is not working!". I thought I could write a program that would test a few things that they could run and have easy answers to my questions when they call. Things like "Is your internet connection alive?", "can you send mail but not receive it?", etc.
I have created a COM callable assembly which consists of an Interface, a single class which implements the interface. In this case the implementation is a single method.I have registered the assembly, created a type library and added the assembly to the GAC.I thought about opening an Office application like WORD or EXCEL 2003 and trying it from there but beyong referencing the COM assembly I have no idea how to code it.
I have a windows form application that connects to an access database. When the program is running it connects to the database and populates several textboxes that are bound to the dataset. I have been researching for 2 days and cannot find exactly what..I need, although a few threads have given me a better insight into my dataset. I would like to type text into a textbox that is bound to the primary key and when I tab out of the textbox (lostfocus event) have the program do a quick search of all records in the dataset of the primary key and if a duplicate exists, msgbox the user that that particular text is a duplicate and is not allowed, however if the text is not a duplicate, continue the tab keystroke allowing the cursor to move to the next textbox bound to the database.
I am currently using the following code to check for the presence of an entry in a table. I choose this code because I thought it was a good idea to use a public function to reduce the amount of code required. It works fine until the field I am checking for contains a' character.I realise I need to use a parameter like @name but cannot work out how to pass the correct information to the public function.how to amend my existing code so I can use @staffNo.
Imports System.Data.SqlClient Dim PaddedStaffNo As String PaddedStaffNo = (TextBox2.Text.PadLeft(4, "0"c))[code].......
I want to test if an image in a picturebox is the same to another image in a picturebox?Also, i get my images from a listBox.I need to use i as a conditional in an if statement.
If (picBox2.Image = picBox1.Image) Then ' code ... EndIf
