C# - Effectively Disable Sort() Within A CompareTo() Override?
Mar 9, 2010
The CompareTo() method for my class is dynamic, and can range from a simple comparison to comparisons on a number of columns. This is all determined at run time, and it works great.But in some cases, I want any attempt to sort a collection of my objects using the default comparison to just do nothing.
Having CompareTo() just return a 0 for any comparison, to my surprise, doesn't work. The list gets rearranged in some odd, seemingly-random order.Is there a way to do this in the CompareTo() method implementation? I'd rather not handle this up at the collection level by having to override Sort().
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Jul 11, 2011
I am using normal thread and I am new to the thread. I want to know effective way of killing thread. I came to know that aborting thread is not good. Somewhere I read we can do this with having continue check on thread processing
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Nov 17, 2009
I am having trouble figuring out how to use arrays effectively. I am trying to use them to store a data from text boxes and and then retrieve the data that's been stored.
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Jan 12, 2011
What's a sound approach to override the CompareTo() method in a custom class with multiple approaches to comparing the data contained in the class? I'm attempting to implement IComparable(Of T) just so I have a few of the baseline interfaces implemented. Not planning on doing any sorting yet, but this will save me down the road if I need to.
Reading MSDN states mostly that we have to return 0 if the objects are equal, -1 if obj1 is less than obj2, or 1 is obj1 is greater than obj2. But that's rather simplistic.
Consider an IPv4 address (which is what I'm implementing in my class). There's two main numbers to consider -- the IP address itself, and the CIDR. An IPv4 address by itself is assumed to have a CIDR of /32, so in that case, in a CompareTo method, I can just compare the addresses directly to determine if one is greater or less than the other. But when the CIDR's are different, then things get tricky.
Assume obj1 is 10.0.0.0/8 and obj2 is 192.168.75.0/24. I could compare these two addresses a number of ways. I could just ignore the CIDR, and still regard as obj2 as being greater than obj1. I could compare them based on their CIDR, which would be comparing the size of the network (and a /8 will trump a /24 quite easily). I could compare them on both their numerical address AND their CIDR, on the off chance obj2 was actually an address inside the network defined by obj1.
What's the kind of approach used to handle situations like this? Can I define two CompareTo methods, overloaded, such that one would evaluate one address relative to another address, and the second would evaluate the size of the overall network? How would the .NET framework be told which one to use depending on how one might want to sort an array? Or do some other function that relies on CompareTo()?
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Feb 13, 2009
Well the context menu strip is the box that appears when we right click during run time if i'm not mistaken. I was trying to make it run but during runtime when i right-clicked in the form nothing happens. I'd like to know if there's a way to make the program run.
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Apr 24, 2012
How can I use a timer function to animate a form's width being smoothly expanded and contracted on the click of a button. The resultant effect that I'm looking for is exactly what happens when you run windows native calculator
1.Windows + R key. Run: "Calc"
2. Change the views from View option between "Standard" and "Scientific".
I've tried declaring two subs, using width += ## and width -= ##, but that doesn't output what I want, it just messes up things..
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Dec 3, 2009
I am using a datepicker control that doesn't like "compareto" is there an alternative I can use (apart from using a bog standard datepicker)
If dpEndTimeDate.Value.CompareTo(dpStartTimeDate.Value) < 0 Then
dpStartTimeDate.Value = dpEndTimeDate.Value
End If
Message: Compareto not a member of 'Date'
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Dec 22, 2011
I am confused what will happen, when I disable a timer. Will it finish the process and then disable or will it immediately disable without completing process? for example
[Code]....
I want to run getMessage from somewhere else, so I need to disable timer during that time to be asured not to override anything and also before timer disable it should complete that function code.
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Dec 15, 2010
How can I improve this bit below to make the items in the TreeView to sort faster or something totally different to sort them easier?
[Code]...
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Jan 30, 2010
I'm using Crystal Reports within VB.NET and Visual Studio 2005.I have a report with several subreports. I'm setting List(Of MainStuff) as the data sources for the main report. I'm setting List(Of SubreportStuff) as the data source for the subreport. Each SubreportStuff has a key which links back to a particular MainStuff, so the report groups each MainStuff item with its related SubreportStuff items. (Or, at the DB level, SubreportStuff items have a foreign key, which is the primary key in MainStuff.)
Below shows the Load function for the dialog, which contains a CrystalReportsViewer. In the Crystal Reports report editor (within VS 2005) I set the subreport link to pull only the related items into that part of the report.
Imports System.Windows.Forms
Public Class dlgMyReport
Private rpt As New MyReport
Public theMainList As New List(Of MainStuff)
[code]....
This works fine.Now, though, what I'm needing to do is in essence the same thing, but pull items based on the keys in the subreport items. This would mean having a subreport within a subreport. However, it doesn't appear that I can do this (the option for inserting a subreport is grayed out when I try to insert in something that is already a subreport).
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Jul 5, 2011
I have a MyObject; myObjects as List(Of MyObject) and a delegate Comparison(Of MyObject) that uses a lot of comparison functions (ByA, ByB, ByC etc) Ã la:
Shared Function CompareMyObjectsByName(x As MyObject, y As MyObject) As Integer
Return x.Name.CompareTo(y.Name)
End Function
[Code].....
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May 16, 2009
to disable right click and to disable the start button and task bar?
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Jan 29, 2009
Sub Sort()
ReDim RollsCC(NumOfPlayers - 1)
For N As Integer = 0 To (NumOfPlayers - 1)[code]....
Here I am creating a temp single dimensional array, merging my 2d array into it, and then attempting to sort it by Rolls(N,1), which is a integer 1-6, Everything seems to be working right with the exception of this.
RollsCC.Sort(RollsCC, 0, 1)
How would one specify a numeral sort based on the first character in the string? im aware that I am switching Rolls(n,1) and Rolls(n,0) information during the sort.
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Apr 12, 2012
Currently my ListView sorts items by image.index. So 0 is at the top, then 1, 2 and so on. Think of it as an IRC chat room nick list. Ops at top then the rest are sorted alphabetically
[Code]....
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Aug 6, 2010
Unimportant because mostly code-readability is much more important than a few milliseconds, but interesting anyway.I noticed that there are differences between different DateTime Comparisons.I checked 3 alternatives:
Dim clock As New System.Diagnostics.Stopwatch
Dim t1, t2, t3 As Long
Dim Date1 As Date = Date.Now.AddSeconds(2), Date2 As Date = Date.Now
[code]....
Normally i choose first method because it is more readable and fail-safer than the others.Method 3 is the fastest. Is this the method that the compiler would choose when i use the operator overloaded method 1? When yes, why are there differences during runtime?Method 2 is the slowest, maybe because it is shared/static?!UPDATE: added some more values. Now Metod 1 and 2 are pretty equal fast.
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Feb 23, 2009
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.
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Apr 1, 2009
how 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.
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Jan 14, 2011
[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?
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Mar 24, 2010
I 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.
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Oct 2, 2009
Usually my application sends email with a generic system address. But in some cases I want to instead send as the logged in user.
[code]...
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Mar 5, 2009
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...
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Jul 28, 2010
I 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).
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Nov 26, 2009
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]...
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Sep 9, 2009
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" %>
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Aug 30, 2006
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.
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Jan 10, 2011
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?
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Dec 7, 2011
I 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.
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Nov 25, 2009
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.
[code].....
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Jun 8, 2009
I am trying to sort an arraylist using .Sort() but am not sure what to put in the () for the field/column I want to sort on. Here is the portion of my code that creates the array from a SQL Query
[Code]...
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May 21, 2012
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)
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