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• "this" in function parameter

  - by chris

  Looking at some code examples for HtmlHelpers, and I see declarations that look like: public static string HelperName(this HtmlHelper htmlHelper, ...more regular params ) I can't remember seeing this type of construct any where else - can someone explain the purpose of the "this"? I thought that by declaring something public static meant that the class did not need to be instantiated - so what is "this" in this case?

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• MySQL- complex data query in a single statement

  - by yoda

  Hi, Consider the following structure : Ignore the table user_token. Now, imagine that you need to get all the roles related to an user, wich may be through it's related groups or directly related to him. In case the same role appears related to a group and the user directly, the role related to the user will prevail over the role given by the group. Is there any chance this could be done in a single query? Cheers!

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• Good resources for learning WPF

  - by user185040

  I am very new to WPF and I am interested in learning it. I have gone through some tutorials, but I am looking for a website or book containing projects/assignments along with solutions so that you can code and learn. As I work through a project, I'd like to be able to refer to a solution in case I get stuck somewhere. Can someone please share any links/material if you have which can give me some WPF Projects/assignments to work on along with solution. Thanks.

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• How do "and" and "or" work when combined in one statement?

  - by orokusaki

  For some reason this function confused me: def protocol(port): return port == "443" and "https://" or "http://" Can somebody explain the order of what's happening behind the scenes to make this work the way it does. I understood it as this until I tried it: Either A) def protocol(port): if port == "443": if bool("https://"): return True elif bool("http://"): return True return False Or B) def protocol(port): if port == "443": return True + "https://" else: return True + "http://" Is this some sort of special case in Python, or am I completely misunderstanding how statements work?

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• What can you do and not do with java annotations?

  - by swampsjohn

  The typical use-case is for simple things like @Override, but clearly you can do a lot more with them. If you push the limits of them, you get things like Project Lombok, though my understanding is that that's a huge abuse of annotations. What exactly can you do? What sort of things can you do at compile-time and run-time with annotations? What can you not do?

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• Is there any way to check for properties of a class for a particular value in c#

  - by Rohit

  I have a License class.There are 50 boolean properties and some timestamp properties. I want to inform user in case all of these 50 properties are false. One way is to use 50 if and if conditions.other way is reflection which seems overkill for this thing. Please suggest some other way. I am using .Net framework 3.5

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• How computer multiplies 2 numbers?

  - by ckv

  How does a computer perform a multiplication on 2 numbers say 100 * 55. My guess was that the computer did repeated addition to achieve multiplication. Of course this could be the case for integer numbers. However for floating point numbers there must be some other logic. Note: This was asked in an interview.

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• How to refresh the properties view in Eclipse RCP?

  - by geejay

  I am using the properties view in RCP, i.e org.eclipse.ui.views.properties.PropertySheet. I want to be able to refresh the content of these properties programmatically. It seems RCP is geared towards the use case where this changes only when a selection changes. Is there any way I can fire a dummy event to get this to refresh (without having ugly UI artifacts such as visibly switching between parts) ?

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• HTML Canvas and saving the data on the server

  - by snitko

  Say I've written a simple app that draws circles in browser. Now I'd like to let people save their pictures. How would I store the data on the server? Which format would be the best option? Should I simply store the relevant html? What would be the case when I would want to make a custom format that is stored on the server and parsed back to html canvas when loaded?

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• jQuery Prototype conflict, alternative solutions

  - by lbolognini

  I have a problem as I'm conditionally including the Prototype-based Lightbox script for IE6 as it works better than the jQuery plugin. Of course the two libraries conflict but the official solution is not really feasible for me as i would have to replace tons of $ with the alternative no-conflict syntax. Is there any other solution for me, keeping in mind that in my case it would be easier to have Prototype work nicely with jQuery than the other way around?

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• Transposing UML into code

  - by James P.

  Short question. How do you go about transposing UML diagrams into code? The class diagram is an obvious one but what about others Activity, Use Case, Sequence, State, Package, etc.?

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• How can you display upside down text with a textview in Android?

  - by Ravedave

  How can you display upside down text with a textview in Android? In my case I have a 2 player game, where they play across from each other. I want to display test to the second player oriented to them.

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• Is there any issues with always self closing empty tags in html?

  - by Simon

  Are there any browser issues with always collapsing empty tags in html. So for example and empty head can be written like this <head></head> but is can also be written like this <head/> Will the second case cause issues in any scenerio? Thanks

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• how to this query in right syntax or right way??

  - by MZT

  i write this query using t-sql and give me an error (Incorrect syntax near the keyword 'OR') How to write it in correct way ? SELECT SUM(Quantity) FROM Invoices WHERE Invoices.InvoiceDocStatusID = CASE @InventoryType WHEN 1 THEN ((2)OR(1)) ELSE 2 END

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• Given a list of IP address, how do you find min, max ?

  - by zeroin23

  In Java, i have an arrayList of ip address. how do i find the min and max ? I have used the Collection.min() but it doesnt work given a case like : 192.168.0.1 <--min 192.168.0.250 192.168.0.9 <--max how do i return 192.168.0.1 <--min 192.168.0.250 <--max instead?

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• regarding C++ stl container swap function

  - by sm1

  I recently learned that all stl containers have swap function: i.e. c1.swap(c2); will lead to object underlying c1 being assigned to c2 and vice versa. I asked my professor if same is true in case of c1 and c2 being references. he said same mechanism is followed. I wonder how it happens since c++ references cannot be reseted.

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• Having duplicate enumerator values

  - by whirlwin

  I'm creating a Tetris clone in C++, and I have an enum GameProperty, which is specified as follows: enum GameProperty { NUM_OF_TETROMINOES = 7, NUM_OF_TILES = 4, TETROMINO_ROTATIONS = 4 }; In my case, I only use these values when looping through a tetromino's tiles, e.g: for (int i = 0; i < TETROMINO_TILES; i++) { } Is it under any circumstance considered bad practice to have multiple enumerators with the same value?

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• How to get the name of the method that caused the exception

  - by SKumar

  My code looks as below. try { _productRepo.GetAllProductCategories(); } catch (Exception ex) { //Do Something } I need a way to show the method name, suppose in the above case if any exception is thrown in the GetAllProductCategories() method, I need to get this method name i.e. "GetAllProductCategories()" as my result. Can any one suggest me how to do this?

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• How to store data using core data in iphone?

  - by Warrior

  I am new to iphone development.I want to show a form a and store the contents in to a core data database after clicking the submit button.I have created a form.xcdatamodel and class events.h and events.m with reference to the apple docs.In some Sample codes the values are stored statically in the delegate class and they use core data delegate methods. But in my case the form view come after passing 2 views. I want to store the data entered here .How can i achieve it.Please help me out.Thanks.

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• How to find buggy class in java?

  - by I.Randanad

  I have a big program on java, that uses multithreading. In some case, the program starts loading 100% of three cores of my eigth cores system. In normal use, the program use all cores of 1-2 percent loading. How can i find a class, that overloading cores?

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• What's the most efficient way to pull culture information out of a resx's filename in c#?

  - by Lee Warner

  What's the most efficient way to pull culture information out of a resx's filename using C#? The solution should also handle there not being culture info in the file name (ie form1.resx). In that case a string assigned "Default" should be returned.

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• Sort string based upon the count of characters Options

  - by prp

  Sample Data : input : "abcdacdc" Output : "cadb" here we have to sort strings in order of count of characters. If the count is same for characters. maintain the original order of the characters from input string. my approach: i have used array of 26 for maintaining occurrence of all characters and sort it then print it.But while doing so i am not able to maintain order in case if two characters have same count. please suggest any improvement or any other algo.

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• slicing arrays in numpy/scipy

  - by user248237

  I have an array like: a = array([[1,2,3],[3,4,5],[4,5,6]]) what's the most efficient way to slice out a 1x2 array out of this that has only the first two columns of "a"? I.e., array([[2,3],[4,5],[5,6]]) in this case. thanks.

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• filename and line number of python script

  - by Joey

  Hello everyone, How can I get the file name and line number in python script. Exactly the file information we get from an exception traceback. In this case without raising an exception.

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• java dynamic function calling

  - by dpaksp

  here is that case....i have an String array that contains only method names of yyyyyy.java file in xxxxxx.java file am creaing yyyyyy.java 's instance (say obj) now i have access obj.fuction_name....that function i should get from that String array in loop ...is that possible ... thank u

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