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  • Singleton class design in C#, are these two classes equivalent?

    - by Oskar
    I was reading up on singleton class design in C# on this great resource and decided to go with alternative 4: public sealed class Singleton1 { static readonly Singleton1 _instance = new Singleton1(); static Singleton1() { } Singleton1() { } public static Singleton1 Instance { get { return _instance; } } } Now I wonder if this can be rewritten using auto properties like this? public sealed class Singleton2 { static Singleton2() { Instance = new Singleton2(); } Singleton2() { } public static Singleton2 Instance { get; private set; } } If its only a matter of readability I definitely prefer the second version, but I want to get it right.

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  • c# winForms open forms inside mainform

    - by user508284
    Hello guys, I have programmed c# application i will post screenshot. In this main form is 3 buttons which opens different forms. Now i decided to modify this application I want to Make one main form with strip menu which will open this forms. I used this code but i don't like or i'm doing something wrong. I don't like because there is child controls(minimize, maximize, close) in parent (please see second picture ): Please advice me something. Is MDI good for such job? Thanks! Sell sell = new Sell(); sell.MdiParent = this; sell.Dock = DockStyle.Fill; sell.Show();`

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  • UVa #112 Tree Summing

    - by unclerojelio
    I'm working on UVa #112 Tree Summing. I have what I think should be a working solution but it is not accepted by the online judge due to a basic misunderstanding of the problem on my part. Consider the following inputs: -1 (-1()()) 77 (77(1()())()) or diagrammatically, the trees look like: -1 77 / \ / \ () () 1 () / \ () () According to at least two working solutions, the correct output for the above inputs is: yes no However, I don't understand why the second one should be 'no'. It looks to me like the rightmost path of the tree should give the proper sum. What am I missing?

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  • iPhone: Core Data: Updating a pre-filled database in future app versions.

    - by Cuzog
    I am creating an app with a database of information that needs to be pre-filled. This data will change in future versions. In the same database, I also need to store user editable information since that user edited data directly relates to the pre-filled data. My question is, if I'm pre-filling the database by creating a duplicate data model in a second app and copying over the core data file before release, how would I handle updates to that data in future versions of the app without destroying the user's existing data? Do the core data migration methods handle this, or must I write custom methods to programatically handle the merge at first app launch?

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  • [C#] Own component with panel

    - by Adam
    Hi, I want to create my own component which consists two other panels. One of them has fixed contents (such as control buttons, etc.) and the other is standard panel, where I can add other components in designer (VS2008). I know that I have to create UserControl, where I can place my two panels. Then I want to insert my component into the form. But I don't know how to create behavior where I can add other components (such as buttons, labels, etc.) only into second panel in my component. Could anyone help me with creating this component? Thank you. Adam.

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  • Does Eclipse has a plugin for code clips like in Coda?

    - by Sinan Y.
    There is a very useful "Clips" feature in Coda, do we have such thing in Eclipse? What it does is pretty simple, you save once a code clip which you use very often and assign it a shortcut and when you want to re-use it on editor you type the shortcut you assigned and it automatically pastes that code clip and sets caret position to the defined position. On the example here (second image) when i write 4dom and press TAB afterwards it types me this... jQuery(function($){ //puts cursor here }); Since it is a very useful feature i miss that one on Eclipse, is there a plugin for this? Thanks, Sinan.

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  • What should the SQL keyword "ISABOUT" [deprecated?] be replaced with?

    - by Atomiton
    In MS SQL Full-text search, I'm using ISABOUT in my queries. For example, this should return the top 10 ProductIDs (PK) with a RANK Field in the ProductDetails Table SELECT * FROM CONTAINSTABLE( ProductDetails, *, ISABOUT("Nikon" WEIGHT (1.0), "Cameras" Weight(0.9)), 10 ) However, according to the SQL Documentation ISABOUT is deprecated. So, I have two questions: What is ISABOUT being replaced with? DO I even NEED any extra SQL Command there? ( IOW, would just putting the search phrase 'Nikon Cameras' be better? ) What I was originally trying to accomplish here was to weight the first word the highest, then the second word lower, and keep descending to 0.5 where I would just rank the remaining words at 0.5. My logic ( and perhaps it's flawed ) was that people's most relevant search words usually happen near the beginning of a phrase ( in English ). Am I going about this the wrong way? Is there a better way? Am I asking too many questions? (^_^) Thanks all for your time...

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  • How to insert PHP script into HTML the best way?

    - by Mike
    Hello, I have to insert full path to every single image/css file of my website, because of url_rewriting and I'm looking for the most officiant way to do it. Of course I could do: <img src='<?php echo $full_path; ?>/images/theImg.jpg' alt='alternative text' /> But somewhere I saw people doing it like this, or something: <img src='{full_path}/images/theImg.jpg' /> Now do you know how the second example is possible, or is it just part of some framework and can't be used in normal document? Thanks for answers, Mike

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  • ado.net managing connections

    - by madlan
    Hi, I'm populating a listview with a list of databases on a selected SQL instance, then retrieving a value from each database (It's internal product version, column doesn't always exist) I'm calling the below function to populate the second column of the listview: item.SubItems.Add(DBVersionCheck(serverName, database.Name)) Function DBVersionCheck(ByVal SelectedInstance As String, ByVal SelectedDatabase As String) Dim m_Connection As New SqlConnection("Server=" + SelectedInstance + ";User Id=sa;Password=password;Database=" + SelectedDatabase) Dim db_command As New SqlCommand("select Setting from SystemSettings where [Setting] = 'version'", m_Connection) Try m_Connection.Open() Return db_command.ExecuteScalar().trim m_Connection.Dispose() Catch ex As Exception 'MessageBox.Show(ex.Message) Return "NA" Finally m_Connection.Dispose() End Try End Function This works fine except it's creating a connection to each database and leaving it open. My understanding is the close()\dispose() releases only the connection from the pool in ado rather than the actual connection to sql. How would I close the actual connections after I've retrieved the value? Leaving these open will create hundreds of connections to databases that will probably not be used for that session.

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  • ASP.NET MVC and ApplicationPath

    - by user93422
    Question is about paths and domains: I have an out-of-the box ASP.NET MVC project (generated by "File-New Project"). On LogOn page it does: return Redirect("~/Account/LogOn");. I have a domain name: mycompany.com, and following file structure on the server: /Root /MyApp (this is where my app goes into) Default.aspx ... I have set up following domain pointer: mycompany.com -> \MyApp When I go to mycompany.com I get an error, something about can't find mycompany.com/MyApp/MyApp/Account/LogOn Question: Where does second /MyApp path element comes from? Note: If I don't use domain pointer and deploy the site to the root - everything works just fine. Note: My hosting provider is webhost4life.com.

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  • I need to know what link is clicked, how do i get these variables with cherrypy?

    - by user291071
    Lets say I display 3 links, I want to accomplish 2 things, know which link is clicked, and record this choice in a list/pickle or txt file but also capture this variable in cherrypy so I can perform another action. How do I do this? Its been suggested that I use a query string which makes sense but I can't get the querystring variable to cherrypy to use for further actions. So would anyone have a simple code of cherrypy with lets say 2 pages and have one page display 2 links with a querystring in each and the second page able to get that value?

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  • UIViewControllers - TabBarApplication - iPhone SDK

    - by Kevin
    Hello everyone, I am very new to the iPhone SDK. I need to know if in a tab bar application I need to make UIViewController classes. For example, when I make a new tab bar application there is a default FirstViewController class (.h, .m) already there. Now if I have code on the second tab, would I need to create a SecondViewController class? If not, how would I make a button on the 2nd tab, and make that button do something. I'm not really sure how to do it, because the FirstViewController works with the buttons and code, but if I make a SecondViewController, and I link everything my app crashes. If anyone could help it would be greatly appreciated. Kevin

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  • Double of Total Problem

    - by Gopal
    Table1 ID | WorkTime ----------------- 001 | 10:50:00 001 | 00:00:00 002 | .... WorkTime Datatype is *varchar(. SELECT ID, CONVERT(varchar(10), TotalSeconds1 / 3600) + ':' + RIGHT('00' + CONVERT(varchar(2), (TotalSeconds1 - TotalSeconds1 / 3600 * 3600) / 60), 2) + ':' + RIGHT('00' + CONVERT(varchar(2), TotalSeconds1 - (TotalSeconds1 / 3600 * 3600 + (TotalSeconds1 - TotalSeconds1 / 3600 * 3600) / 60 * 60)), 2) AS TotalWork From ( SELECT ID, SUM(DATEDIFF(second, CONVERT(datetime, '1/1/1900'), CONVERT(datetime, '1/1/1900 ' + WorkTime))) AS TotalSeconds1 FROM table1 group by ID) AS tab1 where id = '001' The above Query is showing "double the total of time" For Example From table1 i want to calculate the total WorkTime, when i run the above query it is showing ID WorkTime 001 21:40:00 002..., But it should show like this ID Worktime 001 10:50:00 ..., How to avoid the double total of worktime. How to modify my query. Need Query Help

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  • Random noise in Solr score

    - by Andrea Campi
    I am looking for a way of introducing random noise into my scoring function, and I'm at a loss on how to best proceed. Some background: We use Solr for a web application that manages large-ish sets of photos for agencies. One customer has an interesting requirement for scoring: 'quality' field, maintained by editors, from 1 (highest) to 3 (lowest); 'date' field, boosting more recent photos; I would probably use a logarithmic function; However, due to how the stock photo market works, this will likely result in many similar photos appearing together. Their request is to give 'quality' a large boost, but introduce some randomness so that photos will not appear in a strict date order. Any idea? EDITED: a key requirement is to have "stable" query results: if I search twice for "tropical island" I can get a slightly different result set, but if I ask for the first page, then the second, then the first, I'd better get the same results :)

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  • how can I retrieve an html document from a url from javascript?

    - by Matt
    Hi, I have a url and I want to retrieve the html dom generated when going to the url (all the code for the page) in a javascript variable. How can I do this? I'm guessing an html get or post? Can anyone give an example with jQuery? Every time I do a $.get or $.post like this: $.get("http://www.google.ca", function(result) { alert(result); alert($(result).html()); }); $.post("http://www.google.ca", function(result) { alert(result); alert($(result).html()); }, "xml"); the first alert in each call comes up blank and the second comes up as null. Any ideas? Thanks, Matt

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  • Avoiding NPE in trait initialization without using lazy vals

    - by 0__
    This is probably covered by the blog entry by Jesse Eichar—still I can't figure out how to correct the following without residing to lazy vals so that the NPE is fixed: Given trait FooLike { def foo: String } case class Foo( foo: String ) extends FooLike trait Sys { type D <: FooLike def bar: D } trait Confluent extends Sys { type D = Foo } trait Mixin extends Sys { val global = bar.foo } First attempt: class System1 extends Mixin with Confluent { val bar = Foo( "npe" ) } new System1 // boom!! Second attempt, changing mixin order class System2 extends Confluent with Mixin { val bar = Foo( "npe" ) } new System2 // boom!! Now I use both bar and global very heavily, and therefore I don't want to pay a lazy-val tax just because Scala (2.9.2) doesn't get the initialisation right. What to do?

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  • NAVT WordPress Plugin - Just a quick question

    - by Michael
    Hi, I got this plugin and have created my list etc and it's appearing fine. However, I am wondering how I create a list under another list...like the second level part of the list? I'm trying to create a dropdown menu you see. In the admin, when I try and drag the item over, it will only let me put it in the first level, how do I get it to go under a sub-item? I would consult the NAVT blog etc but the documentation is so poor it's a kind of joke. But I guess it IS free :) Many thanks, Michael

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  • How can I view multiple git diffs side by side in vim

    - by Pete Hodgson
    I'd like to be able to run a command that opens up a git diff in vim, with a tab for each file in the diff set. So if for example I've changed files foo.txt and bar.txt in my working tree and I ran the command I would see vim open with two tabs. The first tab would contain a side-by-side diff between foo.txt in my working tree and foo.txt in the repository, and the second tab would contain a side-by-side diff for bar.txt. Anyone got any ideas?

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  • Looking for a component (.NET or COM/ActiveX) that can play AVI files in a WinForms app

    - by MusiGenesis
    I'm looking for something like the Windows Media Player control that can be hosted on a form. The WMP doesn't work for me because I need a control that can play a continuously-appended playlist of AVI files in sequence, so that the transition from one file to the next happens seamlessly (i.e. without any glitches or pauses in the video and audio). With WMP, there's always a delay between files of half a second or so. Does anyone know of a control (it can be either commercial or open-source) that can do this? I assume anything like this wraps DirectX, and that's OK too.

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  • Is there any difference between md5 and sha1 in this situation?

    - by Vili
    It is known that 1. if ( md5(a) == md5(b) ) 2. then ( md5(a.z) == md5(b.z) ) 3. but ( md5(z.a) != md5(z.b) ) where the dots concatenate the strings. What happens in the second row if we change all the md5 to sha1? So: 1. if ( sha1(c) == sha1(d) ) 2. then ( sha1(c.z) ?= sha1(d.z) ) I couldn't find two different strings with same sha1, that's why I'm asking this. Are there any other interesting "rules" about sha1?

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  • How switch UIViewController by flip from 3 controllers ?

    - by Sergey
    Hello, all. I've got next problem: i've got 3 UIViewController and need to switch controllers by UIModalTransitionStyleFlipHorizontal. Next code working fine: testController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; [self presentModalViewController:testController animated:YES]; where testController - next controller to switch, self - current controller. And when i've set 3rd controller - it's working fine, but i have problem with back to first controller - when i back to first controller - i can't go to second controller. 1 - 2 - 3 - 1 - it's working fine, but - 2 - don't show. what's mistake ?

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  • WPF - 'Relational' Data in XAML Using DataContext

    - by Andy T
    Hi, Say I have a list of Employee IDs from one data source and a separate data source with a list of Employees, with their ID, Surname, FirstName, etc. Is it possible in XAML only to get the Employee's name from the second data source and display it next to the ID, using something like this (with the syntax corrected)?.. <TextBlock x:Name="EmployeeID" Text="{Binding ID}"></TextBlock> <TextBlock Grid.Column="1" DataContext="{StaticResource EmployeeList[**where ID = {Binding ID}**]}" Text="{Binding Surname}"/> I'm thinking back to my days using XML and XSLT with XPath to achieve the kind of thing shown above. Is this kind of thing possible in XAML? Or do I need to 'denormalize' the data first in code, into one consolidated list? It seems like it should be possible to do this simple task using XAML only, but I can't quite get my head around how you would switch the DataContext correctly and what the syntax would be to achieve this. Is it possible, or am I barking up the wrong tree? Thanks, AT

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  • In Perl, given two IO::Socket's how do I connect 1st socket's input to 2nd's output and vice versa?

    - by bodacydo
    Suppose I have made two connections in Perl with the help of IO::Socket. The first has socket $s1 and the second has socket $s2. Any ideas how can I connect them together so that whatever gets received from $s1 got sent to $s2 and whatever gets received from $s2 got sent to $s1? I can't understand how to do it. I don't know how to connect them together. I would expect to do something like $s1->stdin = $s2->stdout and $s2->stdin = $s1->stdout, but there are no such constructs in Perl. Please help me! Thanks, Boda Cydo.

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  • Copy one jagged array ontop of another.

    - by George Johnston
    How could I accomplish copying one jagged array to another? For instance, I have a 5x7 array of: 0, 0, 0, 0, 0, 0, 0 0, 0, 0, 0, 0, 0, 0 0, 0, 0, 0, 0, 0, 0 0, 0, 0, 0, 0, 0, 0 0, 0, 0, 0, 0, 0, 0 and a 4x3 array of: 0,1,1,0 1,1,1,1 0,1,1,0 I would like to be able to specify a specific start point such as (1,1) on my all zero array, and copy my second array ontop of it so I would have a result such as: 0, 0, 0, 0, 0, 0, 0 0, 0, 1, 1, 0, 0, 0 0, 1, 1, 1, 1, 0, 0 0, 0, 1, 1, 0, 0, 0 0, 0, 0, 0, 0, 0, 0 What would be the best way to do this?

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  • C++/CLI .ToString() returning error

    - by George Johnston
    I am a beginner to C++/CLI as I come from a C# background. I am currently writing a wrapper for some native C++ code. I have the following methods: void AddToBlockList(System::String^ address) { char* cAddress = (char*)(void*)Marshal::StringToHGlobalAnsi(address); _packetFilter->AddToBlockList(cAddress); } void AddToBlockList(IPAddress^ address) { char* cAddress = (char*)(void*)Marshal::StringToHGlobalAnsi(address.ToString()); _packetFilter->AddToBlockList(cAddress); } ...The first method works fine and converts my string into the character array. However, the second function with the IPAddress object as the signiture gives me the following error: error C2228: left of '.ToString' must have class/struct/union ...When I type ? address.ToString() ...in the command window, the IP Address prints. Not sure where I'm going wrong. Any ideas?

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