Call A Class From A Variable?
Jul 17, 2009How can I call a class from a variable ?
Something like :
Dim strClassName As string = "clsAction"
Dim newclass = strClassName
I know that this code doesn't work, but how can I do it, if possible.
ADVERTISEMENT
How To Call Variable In Public Class
Aug 22, 2011I have this public class
Public Class commonSettings
Dim etcString As String = "some string"
End Class
How can I call etc String and use it entirely on my code?
String Variable For Use With LINQ To SQL Class Stored Procedure Call Has Weird Message?
Feb 4, 2010In my project I am using a LINQ to SQL class that contains a stored procedure which includes a string value as an output parameter.So to capture that, I created a string variable as follows in the procedure:Dim spOutput As String? However, when I do this I get the following message "Type 'String' must be a value type or a type argument constrained to 'Structure' in order to be used with 'Nullable' or nullable modifier '?'"
View 2 RepliesAdd / Implement An Interface To An Existing Class Without Changing Code Anywhere That Call The Class And Functions
Mar 1, 2010I need to create unit testing project for my current website. The currentw ebsite si written in VB. All unit testing examples are using interface to create mock object. My current VB class does not implment any interface. Can I add interface and implement it to my current class and functions without affecting or changing codes to any pages in my website that call the functions? For examples my current class is like:
[Code]...
Call Method Base Class In Program Passing Sub Class Objects?
Apr 22, 2012Base class has one field to hold numeric balance value. With 2 methods that accept arguments for adding and subtracting the new input calculating new balance. Sub class has four fields dates, transaction, memo and amount.I have a deposit form, and withdraw form. Each time one transaction is entered it creates an object with sub class fields, then adds to the account collection. My problem is not understanding how to call the deposit/withdraw method and pass the current transaction amount back to the base class to alculate the new balance. Does anyone have any links to information/tutorials on how to perform something like this? As you can see with my code I have tried various different approaches without any success.
[Code]...
VS 2008 Use The Value Of One Variable To Call Another Variable Of The Same Name?
Feb 7, 2011I am trying to use the value of one variable to call another variable of the same name.I have 2 variable one called VAR1 and VAR2.
The variable VAR1 has a value of "VAR2"
The variable VAR2 has a value of "HELP"
I want to be able to get the value VAR2 from the variable VAR1 I have defined the value of VAR2 early in the code and now I want to call that value by using the value of VAR1.The reason I am doing it this way as I have a list of 50 variables that are pulled from one system. Each of these variables have the same name as the columns of a spreadsheet. The total number of Variable stay the same but the total column headers may vary each time. I need to loop through each of the column headers match them with the variable names and add the data to the spreadsheet.
VAR1 = "VAR2"
VAR2 = "HELP"
i =1
[code]....
This is the tricky bit...if the value of the cell(1,i) = "VAR2" How do I get it to display the value of the variable of the same name In this case how will I get it to display "HELP" when I only have from the VAR1 value "VAR2" I know my code will bring back the value as a string but I want it to bring back that string as a variable and display the value of that variable?
Call Functions Within A Class Upon Instantiation Of That Same Class?
Mar 23, 2012Is there a way to call functions within a class upon instantiation of that same class? Basically, I have functions within a class, but I want to automatically call some of those functions simply when there is an instance of the class created.
Basically, I have this structure:
Dim instance as new class
instance.function1
instance.function2
[Code].....
Class Inheritance Object Variable Or With Block Variable Not Set?
Sep 26, 2011i had a class called Tag with a structure like:
public class Tag
private _members
public properties
public shared database_methods
end class
this class was tailored for mysql database. i'm currently adding access 2007 support so i split tag into tag and tagdata with structures like:
[Code]...
Inside The Service Class, Declare A Class Variable Named Started?
May 8, 2012Create a class named Service. Inside the Service class, declare a class variable named Started. The datatype of this variable is Boolean.Public Class Service Dim started as Boolean End Class Create a class named Server. Inside the Server class, declare a dynamic array that can contain elements of the type Service.(Note: For convenience, both the array and the variable Started can be accessible from a client program that creates an instance of Server and Service respectively)
Create a constructor for the Service class. When the constructor is executed, it will set the value of the class variable Started to True. Create two new classes: WebServer and DatabaseEngine. Both of these classes inherit from the class Service. Inside the Service class, declare a Sub procedure (method) named Terminate. This method should display the following text Service stopping in a message box when executed.This method can be overridden in classes that inherit from Service class.
Inside both the WebServer and DatabaseEngine class, override the method Terminate inherited from their base class Service. Both methods should first call the base class Terminate method. The messages Web server stopping and Database engine stopping should also be displayed in a message box when the Terminate method for the WebServer and DatabaseEngine are called respectively. These messages should only be displayed if the Started variable inherited from their base class is not equal to False.
Inside the Server class, declare a method named Shutdown. This method does not return any value. When executed, it will call the Terminate method for each of the Service instances (if any) in the arrServices
array. You should call the Terminate method within a For Each loop that loops through the elements of the arrServices array.
In the Sub Main method, create an instance of the class Server. Set the size of the arrServices array in
your Server instance to contain 2 elements. Create first a WebServer instance and then a DatabaseEngine
instance into this array. Call the Shutdown method from your Server instance.
Unable To Use An Instance Of The Nested Class Through A Public Variable Of The Parent Class?
Jun 7, 2012I want to created a nested class that can only be visible to and instantiated from the parent class.But I also want to be able to use an instance of the nested class through a public variable of the parent class.I tried making the nested class private, or making the nested class' constructor private, but it won't compile.Is it possible to do this in .NET?
[Code]...
Can't Set DataTable Class Level Variable = Class Table Property?
Sep 29, 2011I have procedure (Import) that calls a for a new instance of frmImportData. I also have a class name clsBatch that has a data table property called prpParametersTable.For some reason, I get an error (indicated below with ERROR>>>) when trying to assign prpParameterTable to cv_dtImport2. The error states "Object reference not set to an instance of an object.". Why does this error not happen when I assign dtBP to cv_dtImport1? Both cv_dtImport1 and cv_dtImport2 are equal to Nothing and in my Import procedure dtBP = prpParametersTable.
Public Sub Import(ByVal clsB As clsBatch)
Try
Me.cv_clsB = clsB
[code]....
Class Property Usage - Unable To Retrieve A Variable From On Class
Nov 14, 2009I have three class files, accounts.vb and transactions.vb in addition to my form.vb. I am unable to retrieve a member variable from on class from inside the other. When the combobox index changes, the program loads the correct account (checking or saving) from two different sequential files. I don't think I have the calcBalance procedure in the correct class file. And that is what I am having trouble with. Accessing it to display it. [Code]
View 1 RepliesVariable Class Names - Rename My Class Human To Man
Dec 18, 2009What i'm trying to do:
I've got a library which includes a class:
Class Human
End Class
and another class which refers to the human class
Class ASD
Private somevar as new Human
End Class
Ok now i've got a problem, i wish to rename my class Human, to Man. i've got to change Human to Man 2 times, which is OK but the problem is that in the real case, its not just 2 times, its like 500 times or more.
Well its something like a PHP on Javascript.
the following shows the solution of what i'm trying to do, but its in another language PHP/Javascript:
note: in php $ sign declares a variable, echo writes the variable out
CODE:
Is there anyway to do that with VB?
Defining A Global-class Variable Before The Class Is Used?
Jan 31, 2011I have the following code:
Option Explicit On
Imports System.DirectoryServices
Imports System.IO
[code].....
Use CType To Change An Object Variable "obj" To Custom Class That Reference Using A String Variable Like Obj.GetType.Name?
Feb 9, 2011The code below works for the class that I hard coded "XCCustomers" in my RetrieveIDandName method where I use CType. However, I would like to be able to pass in various classes and property names to get the integer and string LIST returned. For example, in my code below, I would like to also pass in "XCEmployees" to my RetrieveIDandName method. I feel so close... I was hoping someone knew how to use CType where I can pass in the class name as a string variable.
Note, all the other examples I have seen and tried fail because we are using Option Strict On which disallows late binding. That is why I need to use CType.I also studied the "Activator.CreateInstance" code examples to try to get the class reference instance by string name but I was unable to get CType to work with that.When I use obj.GetType.Name or obj.GetType.FullName in place of the "XCCustomers" in CType(obj, XCCustomers)(i)I get the error "Type 'obj.GetType.Name' is not defined" or "Type 'obj.GetType.FullName' is not defined"
'+++++++++++++++++++++++++++++++
Imports DataLaasXC.Business
Imports DataLaasXC.Utilities
[code]....
Call A Subroutine By Variable Name (In .Net)?
Jun 21, 2010what I need to do is to call/run/execute a subroutine using a varaible name from a subroutine.
Public Sub Main(ByVal subName as String)
Call subName ' subName may be contain the value AAA or BBB
End Sub
[code]....
Call Member Through Variable?
Nov 6, 2010I have a class with something like [code]...
By doing this, i want the label to display value of cube.m10
I've tried other things like quotation marks or brackets but doesn't seem to work.
Is it possible to do without being too complicated?
Use A Variable To Call A Text Box?
Jul 27, 2011Im new to VB and have written an application which copies data around a network. Im trying to simplify the code that does the copying so i can get it to run as a module.[code]...
View 5 RepliesUsing A Variable To Call A Function?
Aug 27, 2010I have searched, but am not exactly sure what to call this process, so it's difficult to know what to search for. I have a set of functions that are almost Identical, so I want to call them, for example, function1(), function2(), function3(), etc. I want to be able to define and call them with a bit of code that says something like.
[Code]...
VS 2008 Call .exe From VBA Using A Variable
Apr 7, 2010I have created a project using VB.Net(VS2008) and created the exe file. I have another project in VBA (Excel 2003). The project basically IC-Testing based. So according to the device type the Excel workbook name varies. For example I have AAAA.xls, BBBB.xls, CCCC.xls. When I open AAAA.xls, I want to call the .exe (which is developed in VB.Net) with the variable "AAAA". i.e when the exe program runs, it knows which Excel is opened or from which Excel the .exe is called. now I am using Shell retval=Shell("d:Monitor.exe",1). Using this the exe is called and running fine. But the Monitor.exe doesn't know which Excel called it, whether it is AAAA.xls, BBBB.xls or CCCC.xls.
View 1 RepliesCall A Variable With A Variable?
Aug 27, 2010I'm attempting to set a variable from a variable i've searched high and low and looked in many books but still to no avail. I guess i'm using the wrong keyword.I have many public variables like this:
View 4 RepliesCall A Variable Without Addressing It Directly?
Jul 10, 2011So I am having an issue where I want to call a variable without addressing it directly and I get an error for it:
Conversion from string "player1BuzzLock" to type 'Boolean' is not valid.
This is technically correct but why would it fail?
Dim player1BuzzLock As Boolean = False
Dim PlayerNum as Integer = 1
'...
Dim playerBuzzLock As Boolean = CType("player" & PlayerNum.ToString & "BuzzLock", Boolean)
Call Event (method) From Variable?
Mar 9, 2010If I have a string that contains the name of a control is there a way to call that control's click event?
Dim a as string = "MyButton1"
Now I want to call MyButton1.Click Method or MyButton_Click Event using the contents of a.
Call Or Set Variable Value When Its Name Is Stored As String
Jun 6, 2011My application has a variable VAR_1 that is boolean, this name is also stored in database.
Now I need to set VAR_1 value in my app by reading database and asign x value,
How do I call VAL_1 from a string?, this is:
Dim VAL_1 as boolean
Dim str as string = myTable.Rows(0).item("x") <--- Here's the name "VAL_1"
But I just can't find how to call VAL_1 by converting "VAL_1" to variable
Construct A String And Use It To Call A Variable?
Aug 3, 2011This is probably a dumb question but I have to call one of 30 or so global variables by constructing the variable name to be called from another information. However when i do that it treats it as a string. Any ideas on how to make this work?eg something like this:
Public gsNewYork As String
public sub Getinfo
dim lslocation as string
[code].....
Function Variable To Be Separate For Each Call?
Nov 14, 2010Private Function TestFunction (byval VariableA as SomeClass)
Static VariableB as integer
VariableB = variableA.position
[code].....
VS 2005 Call A Subroutine Via A Variable
May 6, 2009I'm looking to call a subroutine via a variable. For example:[code]Is that possible?
View 3 Replies[2008] Call Method Through Variable?
Mar 12, 2009I using VB.NET (VS 2008). I want to know if I can call a sub whereby the name of sub is in a varialbe.
For example :
Private Sub Hello()
Msgbox "Hello"
End Sub
[code]....
I know it does not work that way but how can I call a function or sub using a variable and not directly.
Forms :: Call A Function Whos Name Is In A Variable?
Apr 11, 2011i would like to call a funtion whos name is in a vairable.
Dim Car_service As String
Private Sub ComboBox_Spray_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox_Spray.SelectedIndexChanged
Car_service = ("Spray_" & Me.ComboBox_Spray.Text)
end sub
Call spray_Standard 'this is what i need to change standard is what comes from the combobox 'but i would like to call the funtion depending on what the combobox.text was eg,' if combobox.text was Parkingsensors i would like to call the function call spray_parkingSensors
Private Sub Spray_Standard()
Price_Subtotal = 0
Price_Subtotal = (Damagecount * 65)
Car_Price_Subtotal.Value = Price_Subtotal
End Sub
Should A Local Variable Call Dispose Method And Set To Nothing?
Oct 14, 2009I 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?
View 4 Replies