Why can't I just override the = operator and have it assume that <> is the opposite? Like, if I ask if A <> B, I mean if not (A = B). Straightforward, I would assume.Also, I can't think of ANY circumstance where <> wouldn't be the exact opposite of =.
View 39 Repliesis it possible to force a scroll bar to assume just integers value
View 9 RepliesIs it safe to assume an int will always be 32 bits in C#? The linked question asks whether it is "safe to assume that an int will always be 32 bits in C#". The accepted answer states that "the C# specification rigidly defines that int is an alias for System.Int32 with exactly 32 bits".
My question is this: does this hold true for VB.Net's Integer? Is it safe to assume that Integer will always be an alias for int32?
is it possible to create a variable that can have 2 values ASCENDING and DESCENDING? I need this for a linq querry in this way i dont need to write to querries ( one for each value)
View 5 RepliesI'm sure there is an answer to this somewhere but I'm clearly using the wrong terminology in my searches, so I apologise in advance for this inevitably being a duplicate.Take the function CType. Clearly I can cast (or at least try) a given object to a given reference type. The function will not work if trying to cast to a structure, i.e.CType(myObject, Integer)
will generate a compiler error. This I'm sure most often crops up when working with generics:
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What is the opposite? I want only reference types so that CType doesn't fail. I can't overload the T As Structure with a plain T because it considers them identical signatures, so surely there's a keyword I'm missing somewhere?
I can remember reading some time ago that there is some way to set the opposite value of a variable depending on the value that it is set to but, I can't remember the syntax of it and I'm not sure what the correct terminology is to describe what I'm looking for. Suppose that I have a boolean variable that can be either true or fule. I need to some way set the variable to the opposite value that is set.
Off of the top of my head it was written something like this (excuse the wrong syntax below, it's what I'm trying to figure out :-) ). Dim myBool as Boolean = False myBool = True : False I know this can be done with if else statements but I'm sure I've seen a more compact way to write it.
I'm wanting to to make a color scheme selection feature for my program, which involves changing the foreground and background colors of many components at once. I have the components divided into groups in which all elements should have the same background and foreground.
vb
With BtnLoad And BtnSave And TbxListname And CmbProgDifficulty And TbxRptStandard And TbxQNA And BtnAddProbQ .ForeColor = Color.White .BackColor = Color.IndianRed End With
The problem is that this get's an error message saying that you cannot use "And" (or & or +) in the statement.If I just use one object at a time,
vb
With BtnLoad .ForeColor = Color.White .BackColor = Color.IndianRed End With
it works fine. I have so many objects though, I don't really want to copy and paste this with statement 50 times. is there a way to make a with statement take multiple objects?
Well I am trying to autoscroll my ListBox or display everything the opposite way just like a shoutbox. how to do it. I have tried many ways but they either gave me errors or didn't work.
View 3 Repliescomparing C# code and VB.NET and the results between the seemingly identical code were entirely different.(Why C# is always winning over VB.NET?)The explanation given is that C# will initialize the class fields, then call the base constructor, but VB.NET does the exact opposite. Is there a technical reason for the languages to be different? At first glance, it seems that either approach is equally valid, but I can't fathom why they wouldn't have selected the SAME approach.
EDIT: As 'Jeffrey L Whitledge' has pointed out, VB6 did not have inheritance, so I don't think we can say 'to keep VB.NET and VB6 more closely related'.
Private Sub BindingNavigatorAddNewItem_Click
Code?
End Sub
Can it be done?
I am tightening up my coding with the Option Strict set to ON. It has now produced alot of errors. An example of this is:
If AllocatedDGV.Rows(i).Cells("RoomNumber").Value = RoomsAvailableDGV.Rows(j).Cells("RoomName").Value Then
It gives me the following error: Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity.
I need to write an interface to get data to/from our data files.
We have a low level class that holds field values for each record read from the files.
This just holds two values, the value read from the file (DBValue) and the updated value that may need to be written back to the file (CurrentValue).
These values may be any of the standard value types (integer, date etc) or a string.
Either value (DBValue or CurrentValue) may be null if not defined.
I have written the class to manage this data which works fine while option strict is NOT on.
But we have an office policy of having option strict on all the time.
When I put option strict on, my object value comparisons fail with the error: "Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity."
Question, how should I change the following code to handle option strict on ...
This is all running on Visual Studio 2010
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Possible Duplicate: Is there a conditional ternary operator in VB.NET?
Can we use Coalesce operator(??) and conditional ternary operator(:) in VB.NET as in C#?
I want to perform equality comparison in VB.NET and cannot get it to work. Error: value of type Boolean can not be converted to System.Drawing.PointF
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I've created a user control with a toolstrip having 3 buttons AddEditDelete, and implemeted a generic toolstrip.in some cases, i want to add this menu to a form but only use the delete of this toolstrip and implement a special AddEdit for that form. so how can i tell the form that when the user clicks on add not to do the default add of the toolstrip user control and do the one on the form, in other words i want to override the Add function of the Add button toolstrip.
View 5 Replieshow to override the page_load or any other base page event every time in an application? I keep finding half examples and answers around the web. I want to fire this method every time a page is loaded.
View 2 Replies[code] where mem_stream variable contain the xml file. the problem is that it appends, if the file already exist, to the new one. is there a way to override the old file?
View 1 RepliesI have a WinForms application (OwnerForm) with some UserControl. When textbox of UserControl is changed, I want to filter content of a OwnerForm. But how can I make it? I don't want to specify OwnerForm inside the user control. I know a solution to add manually handlers for MyUserControl.tb.TextChanged to some functions on a owner form, but I think it's bad way. I'll prefer to have overridable functions, but I can't imagine how to do it.
View 5 RepliesUsually my application sends email with a generic system address. But in some cases I want to instead send as the logged in user.
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How to override the SelectedItem property? When you look at the description of the SelectedItem property, the description shows as:"Gets the selected item with the lowest index in the list control". I would like to bypass the "lowest index" portion of the property...I have multiple items in the same list with the same value, but different text. I just want to set the SelectedItem to the actual item I've selected, not one with the same value that appears earlier in the list...
View 16 RepliesI have been experimenting with my windows form application(vb 2008/10) and made sure that the top part(glass part) extended to become a bit larger.
Now 1 problem occurs. Everything, like text, which is black, will become transparent so unreadable. With labels and pictures, I solved the problem, I just write a string(e.graphics.drawstring) and for labels / titles I use a long method(not important).
I would like to shadow/override an event in VB.NET v2
I need to do it, because I need to implement a interface, let's name it IVisibleChanged, on the custom objects that does not have defined this event, and on the objects that already have defined this event (custom Button, by eg.)[code]...
It seems like I can't set the id or name of the form in my masterpage. [it's always "aspnetForm"]
Is there a way to override the uniqueID property of form?
I tried to create a class and inherit from htmlform, but then i can't register it on my mastrepage, [unknown server tag ... ]
im registering it like this
<%@ Register TagPrefix="cf" Namespace="Framework.BaseForm" %>
How do you keep your program showing when someone clicks the "ShowDesktop" button.
I have tried a bunch of properties of the form but cannot find one that overrides the button.
Some of the ones I tried: Resize, LostFocus, Paint, ResizeBegin,ResizeEnd, ClientSizeChanged.
So, to set the body style for a webpage, I can just sayWebBrowser1.Document.Body.Style = stylexBut let's say I set "stylex" equal to "background-color:red;". That will set the background color red but ONLY to websites that do not have a background color already set.ike Google's isn't set so it'd work, but other websites it is set and it won't let me change the background color. So how could I override their style with mine?
View 1 RepliesI registered the hot key Ctrl + s for my application to show and hide a panel using
[DllImport("user32", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool RegisterHotKey(IntPtr hwnd, int id, uint fsModifiers, uint vk);
This method is working fine on my application. The problem is when i opened my application and opened a notepad typed something and tried to save the notepad, it is not saving and in the back side of the notepad my application's, the panel is showing and hiding.
I would like to shadow/override an event in VB.NET. I do it only because I have to implement in this object an interface, that contains the same event like the base object itself, and I need to keep this base event as is it without modification nor supplementary event additions.How can I do it?
Public Shadows Event VisibleChanged As EventHandler Implements IVisibleChanged
So, I would like to implement a interface that contains VisibleChanged event, but to keep functional the myBase VisibleChanged event too.
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I have a project, let's call it "BASE", that has a bunch of .CSV files as Resources. The project makes references to My.Resources.XXXXXXX in different methods where XXXXXXX is the CSV filename. I am working on a class that derives from "BASE" and I would like to change some of the .CSV files and replace the ones that are in the "BASE" project with mine. I would like the methods in the base project to use my CSV files when it calls My. Resources. XXXXXX instead of the files that are in "BASE"'s Resources. Any tips on how to do it? (any .NET language is welcome)
View 1 RepliesI have a listview but I would like to add 3 properties (for example one of them is "image") to the listviewitems in it. I was fine with making a custom class with the 3 properties and just inheriting ListViewItem but now I need to use MultiSelect, so it means doing things like(in For Each loops):
ListView1.SelectedItems.Item(i).Image don't work because it returns a ListViewItem not my CustomClass. I could always do : Ctype(ListView1.selectedItems(i), MyCustomClass).Image
But using that over and over again seems like a waste/wrong way to do it?
I'm trying to create a generic Controller Class for generic events. But these these events still need to access their class variable. So my idea is to create the Base Controller Class with a ModelBaseclass variable as _ClassVar, which is inherited by all of the other class Controller classes will derive from. But I want the derived controller classes to override the _ClassVar with whichever one they need.
I want to do this, so the ControllerBaseClass can have all the generic functions that all the Derived Classes would use.
Model :
Public Class ModelBaseClass
Public Overridable Function Foo() As String
Return "Name"
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