Serialize All The Available Local Variables And Save Them?
May 13, 2010when an exception occures, I want to save the data available on the stack and log it. how can I serialize all the available local variables and save them?
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Serialize Two And VB Returns "local Variable Is Already Declared Within The Current Block?
May 17, 2011I've used this code before but only when I was serializing one array. Here I'm trying to serialize two and VB returns "local variable is already declared within the current block."Someone tell me how to do this correctly, pleases. I'm banging my head against a brick wall that I can't see.
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How To Serialize And Save Application Data
Feb 9, 2010I have searched for an answer for a long time now, both generally ont he web and in several forums including this one. There are many people who asks this or similar qusetions, but the answers are often hard to understand, and quite often are answers to something other than what was asked from the beginning.I know that there are many skilled programmers out there, but most are not great teachers. So here is what I need: I have constructed a program in which the user can write values in textboxes, choose from lists (comboboxes) and make some choices by checking checkboxes. The data in the lists comes from a database, but I don't think that is really relevant here. What I want is, when all the choices are made and when the textboxes, comboboxes and so on have data (text or numbers) in them, I want the user to be able to save this to a file (XML perhaps?).
To speak plainly and visualize this to you, think of a roleplaying game (RPG), and that you fill out a character form with details about your character. Of course you want to save all this, and at some point retrieve it to make changes when you level up. I am not all that stupid when it comes to programming, but I have never tried to do something like this. My applications have had a database engin behind the GUI, and all the saving was done in tables at the far end of everything. Now I want to save data to a file instead. I have tried to find books (or a good tutorial here on the web), but most answers are for C (++. #, etc), or else they are hard to understand.
Is there anyone here who can help me or point me in the right direction? I'm not asking you to do my work for me, but som examples that are valid and that will help me understand the process whould be nice. So far I have recieved good help here on this forum from nice people.
Serialize The Data And Save It To Xml File?
Feb 26, 2011I have a list with class user and I am able to serialize the data and save it to an xml file. However I just cannot figure out how I
can deserialize that .xml file and save the data into a new list.
The following is my code:
Dim Users As New List(Of User)
Dim objStreamWriter As New StreamWriter(filelocation)
For Each btn As Button In myNodeBtns
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I want to read the data back from the file and save it into the mynodebtns list where I orginally took it from.
Disposal Of Local Variables
Feb 3, 2010When you declare a local variable (inside a method), is it automatically disposed when the method ends? Or should I still use variable.Dispose() ?
View 16 RepliesList Of Local Variables
Feb 6, 2010I am using a lot of variables in my code and like to have them listed or printed. How can I do that?
View 3 RepliesList Of Local Variables?
Feb 7, 2010I am a Visual Basic 2008 user (under Visual Studio 2008) and I have numerous local variables in my project. How can I list them to a file or to a printer?
View 2 RepliesReflection On Local Variables?
Feb 13, 2009Is it possible to get the name of a local variable from a reference to the variable? For example, I can get the names and values of a calling function's parameters like this:
Dim frame As New StackFrame(1)
Dim pInfos() As ParameterInfo = frame.GetMethod().GetParameters()
Is there some way to get the same information for a calling function's local variables? This is kind of what I have in mind:
Sub SomeSub()
Dim count As Integer = 10
Dim average As Single = 45.67
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Local Variables Are Automatically Shared
Mar 13, 2012I was reviewing the MSDN documentation on VB.Net's little-used Static keyword for local variables. My question is not about how Static works (I personally plan to avoid using it as it seems like it could cause grief to future programmers who don't notice the side-effects.) My question is about this statement in the docs:[code]So can anyone interpret the above statement for me in a way that makes sense? Or is this a bug in the documentation? It's been there since the VS 2005 version of the docs and is still present in the Visual Studio 11 version.
View 2 RepliesPrivate Fields Or Local Variables?
Apr 18, 2012I am wondering if you have a class and in the class you have a function which executes a sqlcommand. Which would u use ? the local variable declaration or the private member command variable.Assuming that the class has a private field called m_Cmd as OracleCommand..i am using oracle db so i use oraclecommand , if sql server then it should be sqlCommand.[code]
View 3 RepliesVS 2008 Serialize A Class That Implements An Event That Don't Want To Serialize?
Aug 17, 2010If a class is serialized and has events fired from it that are handled on a form you get the error "Form1 cannot be serialized" in c# you can use (to work around this):
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Asp.net - Server.Transfer Losing Local Variables?
Oct 26, 2011For my application, I have a page that redirects to another page (within the same application) via Server.Transfer. I need to do this because the original page has an object that I need to access by using the Page.PreviousPage property.
Once my "destination" page has been fully loaded, a local deep clone that I made of the source page's object is suddenly released from memory once I perform a postback? Is this by design--something to do with the Server.Transfer?
Page1.aspx:
Public Structure myCustomObject
Implements ICloneable
Dim someField as String = "default value" ' Default value
[code]....
At this point, EVERYTHING works as it should. Stuff got cloned over correctly and all is well.(Let's say this is on a button click event) Debug.Write(newObj.someField) ' Output: "default value"<- This is NOT "changed value from source page" for some reason when it was working literally a few lines ago! My guess is that the Server.Transfer stops any association with the source page after the new page loads.
Creating Temp Local Variables - Bad Practice?
Jan 12, 2012When I want to maintain code readability and keep things neat. I would create temp variables . Below is one of my functions that uses it. Is it a bad practice? I would create temp variables cost more memory ?
Private sub test(byref transac as transaction , byref txntime as string )
Dim cmd as OracleCommand = nothing
Dim Adapter As OracleDataAdapter = nothing
Dim SQLStr As New StringBuilder
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Server.Transfer Losing Local Variables?
May 24, 2010I have a page that redirects to another page (within the same application) via Server.Transfer. I need to do this because the original page has an object that I need to access by using the Page.PreviousPage property
View 1 RepliesPrivate Shared Variables Vs Local / Namespace Performance
Jun 8, 2009I came across a number of new Private Shared variables (of type Hashtables(Of String), initialized in the declaration) added to a partial class for a very large (DataContext-derived) class. This seems sensible to me in one sense because they never change, and making these shared variables ensures that they won't get re-initialized every time a function is called. However, these variables are only used within the scope of one function in the class, and I fear the private namespace of this DataContext-derived class is getting rather polluted, and having these sorts of things exposed at such a high level might be confusing to others reading the code in the future.
Would there be negative performance impact to making these local variables within the function where they are used, or is there some better way to handle this? Basically we are using these 3 hashtables to determine whether anything within particular subsets of properties changed (using GetModifiedMembers and then using the Overlaps function of the hashset to see if any of the modified members correspond to members we care about).
Edit: I caved and took the time to write my own test program, which confirmed that there is a cost to using local variables (which I assume applies generally to all cases -- I doubt there's any case where a shared variable would be slower unless using the shared variable requires some additional logic to do so properly): [Code]
So in this particular case, using the local variable costs about 200%. But in most cases (including my own), the time is probably negligible compared to the overall task. So I guess the question now becomes, how do people generally feel about improving code maintainability at the cost of negligible but known performance impacts?
Reading SQL Select Values Back Into Local Variables?
Apr 20, 2010I as part of the support VB code for a larger ASP project, I need to read back the existing data from an Access database, to see if user has changed a value.
I'm reading the existing data back into a DataView using the following function:
Public Shared Function GetPolicyStatus(ByVal intPolicyID As Integer) As DataView
Dim strConString As String
Dim conMyData As OleDbConnection
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Use Of Static Local Variables In Lazy Loading Property
Sep 19, 2011I just recently learned about the uses of static local variables in VB.NET and wondered about it's potential use in lazy loading properties.
Consider the following example code.
Public Class Foo
Implements IFoo
End Class
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As far as i can see, this has a few advantages over the usual implementation, primary your inability to access the variable outside of the property, as well as not having to use an additional variable.
My question to you is: Which of those is the "right" way to do it? I know that static variables have additional overhead, but is it bad enough to create, in my personal opinion, unclearer code that can be misused easier? How much performance do you lose compared to the "traditional" method? How does it matter for small classes compared to huge factories?
How To Get Data From Crystal Report Viewer Fields To Local Variables
Jan 23, 2010I need to get data from reports fields to open others windows forms or other reports, How I can get the values of reports fields to pass to local C# o VB.net variables? After many time ... With this upgrade making click on any Textobject on the Report the ClickPage event fire and in that sub is possible to get the Textobject data. You have to upgrade to Crystal Report 2008 SP 3.6, Link below [URL]
Private Sub crViewer_ClickPage(ByVal sender As Object, ByVal e As CrystalDecisions.Windows.Forms.PageMouseEventArgs) Handles crViewer.ClickPage
If Not IsNothing(e.ObjectInfo.Text) Then
Clipboard.Clear()
Clipboard.SetText(e.ObjectInfo.Text)
Me.CallBackForm(e.ObjectInfo.Name.ToUpper.Trim, e.ObjectInfo.Text)
End If
End Sub
Local Variables In Shared Method Work Like Static Variable In C?
Aug 23, 2011Will the list in this shared method keep its state throughout the life of the method? Or will a new list be created every time this method is called?
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Programatically Get Hold Of The Autos/local Variables That Is Shown When Debugging?
Mar 9, 2010Im trying to build an error-logger that loggs running values that is active in the function that caused the error. (just for fun so its not a critical problem)When going in break-mode and looking at the locals-tab and autos-tab you can see all active variables (name, type and value), it would be useful to get hold of that for logging purposes when an error occur and on some other occasions.For my example, I just want to find all local variables that are of type string and integer and store the name and value of them.
View 1 RepliesSave File In Resources To Local?
Jan 11, 2011I have a file in my resources in visual basic 2010, when the user clicks a button i want the file to be saved on the c drive.How can i do this?the file is not a txt file.
View 4 RepliesFile Transfer And Save On Local Drive
Feb 5, 2010I'm sort of new to the vb 2008, and I would like to be able to send a file to another computer and save it on the local drive. Doesn't have to be in any certain folder, but just on the c drive. I know for the old visual basic you would use winsock for this, but in 2008, they have removed it. What and how will I do this. There will be no program on the user's computer. This is done all from one computer sending to another with no program listening on it. This computer is on my network with network sharing, so I can just do like a \computernameorIPaddress and open send the file that way.
View 2 RepliesAsp.net - Local Static Variables In Timer.Tick Event (Stopping A Timer)
Jul 9, 2009I have a timer on a page in ASP.NET.
After a certain period of time elapses, I want to disable the timer.
I want to put a static variable in the timers tick event that will track how many seconds have elapsed.
My question is, will this work?
If user X and Y are viewing the page will they both have separate local static variables?
What is the best method of shutting down an ASP.NET timer after a certain elapsed time?
Save Picture Image To Local Server And Retrieve?
Apr 15, 2010<VB.Net 2008 + SQL 2005 Server> I am trying to implement an HR application to save an employee picture into local folder of , not into Database, and retrieve by VB.Net application. Only the file location of the picture image will be stored in database instead of the picture.
View 11 RepliesFAQ Item: Save An Existing Project To Different Local Location Via IDE Menu?
Jun 20, 2010How do I save an existing project to different local location via IDE menu?
View 1 RepliesSave Image Inside Page On Local Hard Disk?
Jul 15, 2009I have webcontrol inside windows application now i want save image inside page on my local hard disk?
Possible To Save Variables In Application?
Apr 19, 2010I am trying to build a game (out of fun) similar to those text based games like Wars, iMobster (which can be found on Facebook/iPod). And I came to the point where I need to create a Save/Load system. My game currently has 50-ish variables, and it would be nice if there would be a way to save them in the application themselves, so when it is opened the next time they are all there. I know I can write the variables to a .txt file, and then pull them from there, but those are easy to modify, plus that means one file for each variable (right? Unless there is a way to save all my variables into 1 .txt file?).
View 11 RepliesSave All Global Variables?
Aug 20, 2009I've got a RPG style game I am putting together - mostly to teach myself vb.net. I am using alot of global variables to hold game values.[code]...
My question is -- I am trying to make a "SAVE" and "LOAD" the game's state. Is there a simple way to save the values of all my global variables, without having to type everysingle variable out. Is there anyway to call upon all my global variables at one time, and possible save/load them to a text file ?
Save Variables From One Session To The Next?
Dec 28, 2010what is the best way to save variables from one session to the next.when the program starts i want the defaults to be the same but as they are changed in the program the stored value should update.
View 2 RepliesSending ByteArray Image To Server Side And Save It To Local System?
Aug 19, 2009I want to send a image to server side using HTTPService,I am using ASP.NET for server side coding. I don't know how to write server side code to receive the image sent as a byteArray, and I am also not sure if my client side code is correct or not。is there any IT PRO..[code]I could not get the image in my disk,I think the flex side should have not problem, but the VB code side should be something wrong.
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