Posts by gato • 22,329 points
373 posts
-
7
votes1
answer275
viewsQ: What is the purpose of while(*variable) and if(!*variable) in the statements "while" and "if"?
In Code Review there is a implementation of a simply chained list that I am using. However, in the reply of one of the users, he made some modifications to the list, and had a particular…
-
9
votes2
answers477
viewsQ: What types of resources are released in a "using" statement?
According to Microsoft documentation: The using statement provides a convenient syntax that ensures use correct of Idisposable objects. Source. That is, the interface Idisposable provides a…
-
5
votes1
answer944
viewsQ: How to switch between the next element and the previous element of a Listiterator with just one click?
I have a list of words stored in my variable listaPalavra already initialized with values, of type ArrayList<T>: listaPalavra.add("Palavra 1"); listaPalavra.add("Palavra 2");…
-
6
votes2
answers565
viewsQ: What are ASP.NET MVC routes?
In ASP.NET MVC always appears to me the term route when I read something related to this technology, however, I started studying APS.NET MVC recently and this term route is causing me trouble.…
-
6
votes2
answers475
viewsQ: What is the purpose of automatically generated directories in an ASP.NET MVC project?
In Visual Studio Community 2015 when we create a new project in ASP.NET MVC in the project is automatically generated the following directory structure, see the image below: Being in total eight…
-
16
votes3
answers1008
viewsQ: How is a class organized in memory?
According to this definition of memory: In computing, memory refers to the physical devices used to store programs (sequence of instructions) or data (State information, for example) in a character…
-
4
votes2
answers608
viewsQ: How do I know which Arraylist objects are being modified or deleted?
I own a ArrayList that this preloaded with some objects of the type of my class Person, see: ArrayList<Pessoa> listaDePessoas = new ArrayList<>(); listaDePessoas.add(new Pessoa("Joao",…
-
9
votes1
answer510
views -
13
votes3
answers8989
viewsQ: What is "build" and what is its relationship to the IDE?
In the area of software development has a term that appears very often that is the build. It always comes to me when I read about Android Studio and other development tools (usually Ides), I think…
-
14
votes2
answers6664
viewsQ: How to create and manipulate lists in PHP?
In java it is possible to create and manipulate list of any type of data using the List<E>, See the example below: List<String> lista = new ArrayList<>(); lista.add("Stack");…
-
6
votes2
answers1284
viewsQ: Are there differences between Post and Request?
When I read regarding the request I always get the term post together, and that raises me a doubt. I understand that the request serves to make a request for something to the server and then the…
-
11
votes3
answers1181
viewsQ: How to create a filter from the words/phrases of interest to filter a particular wave from a "List"?
In my example I have two classes that are SetorInteresse and Vaga, below follows the structure of the two: Setorinteresse class: public class SetorInteresse { private List<String> setores;…
-
7
votes1
answer105
viewsQ: Is there an alternative to multiple while loops?
I have a method alterar() that change the data of a particular element of my XML Person, however, this routine uses several whiles one for each element, see below the routine: public void alterar()…
-
2
votes1
answer464
viewsQ: Can View talk directly to Model?
In MVC a View serves to handle the entire user interface, the Model serves to contain the classes that represent the system and its business rules and the Controller performs the communication…
-
32
votes4
answers8677
viewsQ: What’s the difference between data and information?
According to this definition of Datum: Data is a set of information (quantitative, qualitative, categorical or indefinite) can be organized or not. Wikipedia. Following this line I can assume that…
terminologyasked gato 22,329 -
5
votes1
answer2011
views -
9
votes2
answers4637
viewsQ: What is the difference between "node", "attribute", "element" and "tag" in XML?
I am confused about some features and terms of the XML markup language that are: knot, attribute, element and tag, I would like to know what each of them is and what are the differences between…
-
3
votes1
answer5127
viewsA: Correct method to get Datatable populated Combobox value
Just make the conversion to whole using the method ToInt32() see: int valor = Convert.ToInt32(comboBox3.SelectedValue);
-
2
votes2
answers117
viewsA: list.remove() in a row
You can use the method filter and apply a lambda expression to remove whitespace and also empty strings: lista = filter(lambda item: item != ' ' and item != '', lista) Exit: ['a', b', 'c']…
-
4
votes1
answer424
viewsA: As time passes and progressbar grows change the label text
When using the Progressbar it is very useful to use the Backgroundworker to increase the bar (property Value from Progressbar) and leave the application free to do other things. Implementing the…
-
5
votes1
answer159
viewsQ: Purpose of lambda syntax in function/method
In some cases a function/method contains only one line in its scope, see the illustrative example: static int Soma(int a, int b) { return a + b; } Meanwhile, to a new feature in C# 6.0 that allows…
-
8
votes2
answers577
viewsQ: What is the purpose of unsafe command?
I saw the use of the command unsafe, in this code in the declaration of this method: public unsafe static int GetSquareStack(int value) {...} Within the method there seems to be pointer manipulation…
-
3
votes1
answer150
viewsA: How to get the text of the line where the cursor is positioned?
I imagine you have one TextBox with the property MultLine qualified to true. Thus, to obtain the contents of the line where the vertical bar is positioned | just use this method I created…
-
13
votes2
answers2090
viewsQ: What is the IL code and where can I find this code?
In my question about static builders the user Maniero showed how is the code generated from a static constructor by . NET, this code is called Code IL according to his reply. See the IL code of my…
-
15
votes2
answers1287
viewsQ: What is the purpose of a static constructor?
I’ve always used builders as follows: public MinhaClasse() { //Algo ... } However I found that in C# it is possible to create a static constructor as follows: public class MinhaClasse { public…
-
2
votes1
answer119
viewsQ: How to get the content of a tag from a Linq query?
I have XML with the following structure: <?xml version="1.0" encoding="UTF-8"?> <pessoas> <pessoa> <nome>Joao</nome> <email>[email protected]</email>…
-
6
votes3
answers709
views -
11
votes1
answer469
viewsQ: What is the purpose of empty parentheses in a lambda statement?
I created an example of a Lambda statement with no arguments, however, I have doubts regarding the omission of the empty parenthesis () in the statement. Take the example: class Program { public…
-
2
votes1
answer2017
viewsQ: How to store data in RAM and make it available to any module or class in my application?
There are several ways to store the data of a particular application and some of them are: Disk Storage (HD). It can be a text file, XML, or a database file of some DBMS. Cloud Storage (Cloud). It…
-
6
votes2
answers1543
viewsQ: How to select fields in a lambda expression query?
Through the select new from LINQ I can select which fields will be displayed in the query, for example: var subCategorias = from s in db.SubCategoria join c in db.CategoriaProduto on s.id_categoria…
-
2
votes4
answers835
views -
2
votes1
answer2787
viewsA: C# Datagridview align header in center
You could specify the columns, see a small example: dg.Columns["nomeDoMeuCampo"].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter; Editing: I was able to leave the Header…
-
5
votes1
answer1234
viewsA: How to make notification through the taskbar in c#?
You need to add one Contextmenustrip and its application, and then set it in the property ContextMenuStrip of Notifyicon, see in this example: // // notifyIcon // this.notifyIcon.BalloonTipIcon =…
-
24
votes4
answers24580
viewsQ: Is there a difference between Program, Thread and Process?
I wonder if there’s a difference between Thread, Process and Program? These three words are widely used in the area of Information Technology, so it would be interesting to know the difference…
-
7
votes3
answers414
viewsQ: How to change the structure of a LINQ query at runtime?
I have the following example of a program that implements the EF (Entity Framework). The structure of the database and the application is defined as follows: Table Pessoa: Primary key field:…
-
8
votes1
answer557
viewsQ: TDD and Unit Test, both are the same thing and have the same purpose?
Always when I read about TDD (Test Driven Development) it is related to Unit test, It makes me believe that TDD is the same as Unit test, and I don’t know if my definition is correct in relation to…
-
8
votes2
answers1094
viewsQ: How to declare a function within another function in C#?
In Delphi it is possible to declare function within the block of a given function, see this example done in Delphi: procedure TForm1.btnRunClick(Sender: TObject); begin mostrarNome('Carvalho'); end;…
-
10
votes2
answers375
views -
4
votes3
answers342
viewsQ: How and where to implement business rules in the Entity Framework?
I have the following example of a software that uses Entity Framework, accessing a database with only one table called Produtos with the following fields: Field int produtoid. Field string…
-
2
votes2
answers54285
viewsA: Analyze whether the number is even or odd, and which of the numbers is higher
In the instruction where you display the variable num2 when it is odd there was an error in function call print(), see where I’ve changed: #include <stdio.h> int main(void) { int num1,num2;…
-
1
votes0
answers38
viewsQ: What is the purpose of the var command when used in the function statement?
In Javascript it is possible to write functions with or without the use of the keyword var, see below two functions that illustrate this situation: var soma = function(a, b) { return a + b; }…
-
3
votes1
answer1012
viewsA: How to know which keys are pressed in C# Consoleapp and set events
Basically you can use the class ConsoleKeyInfo to get the keys pressed, see below an example: using System; using System.Collections.Generic; using System.Linq; using System.Text; using…
-
10
votes1
answer3149
viewsQ: How does Javascript import libraries?
In programming languages such as Java, C# and C, when we want to use some command or function we should include the library containing the commands we want or the classes if it is object oriented…
-
17
votes2
answers2414
viewsQ: What is the purpose of the "id" and "name" properties of an HTML tag?
When we create a tag in HTML we can assign values to its properties, however, the property id and name, I realize that they are widely used and generally the values that are assigned to them are the…
-
31
votes2
answers7772
viewsQ: What characterizes imperative and functional programming?
What characterizes the imperative and functional programming and what are the differences between them in relation to each other? I cannot understand these two paradigms. Note: If you can cite…
-
12
votes2
answers19181
viewsA: How to check if a table exists in the SQL Server 2005 database and if it does not exist create it and the columns
There is the view INFORMATION_SCHEMA which makes it possible for you to check, and one of its advantages is that it is set by default in different databases and versions of DBMS. See how to…
-
11
votes3
answers2738
viewsQ: How does the browser handle infinite loop in Javascript?
I was doing an exercise on loop repetition for in Javascript on Codecademy, however, in the exercise I came across the following warning: codecadeny Be very careful with your syntax - if you write a…
-
22
votes1
answer5420
viewsQ: What is the programming paradigm used by Javascript?
What is the programming paradigm used by Javascript or if it is like Python that uses multiple paradigms?
-
4
votes3
answers3650
viewsQ: Scanf function with variable amount of parameters, how to implement?
I have a text file (txt) that contains the following values: 12 90 These two values I keep and my variables a and b, that is to say a is equal 12 and b is equal 90, and I’m using the function…
-
9
votes3
answers4376
viewsQ: What is the purpose of the return of the main function and the importance of this function?
I would like to know the importance of the function main and what is the purpose of her return which is a whole? See a minimum example of function implementation main: int main() {…