Posts by Jéf Bueno • 67,331 points
1,254 posts
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3
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viewsA: What is a literal?
A literal is a value that is expressed literally in the middle of your code. In his example, 2 is a literal. Public Const MyByte As Byte = 2 In the example below (in C#), my text is a literal var…
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answer367
viewsA: What does equals(Object o) mean in this method?
equals(Object o) is, like the bfavaretto I have already said, part of the signature of the method - here has more details about method signature. This defines the method name (equals) and its…
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answers10118
viewsQ: Where should the business rule be in the MVC standard?
A few weeks ago I started to study in depth ASP.NET MVC and, as I came from Windows Forms, there are some things that have not been very clear yet. In all the applications I’ve done so far in this…
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answer855
viewsA: C# Error Nullreferenceexception in Tolist() method
The problem is that the variable uDao is not being initialized at any time, at least not in the code that was posted in the question. See this excerpt private UsuarioDAO uDao; public…
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answer498
viewsQ: When does the Entity Framework execute the query of a Iqueryable?
I am developing a method for an API that consists of the following: fetching all customer reviews and, if specified, limiting the amount of records that will be returned. For example: public…
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answer157
viewsA: Which List Findall method is used in a Datatable
You can use the method AsEnumerable() to "convert" your DataTable for a IEnumerable<T>, then you can use the Where() to filter the data. var Filhos = FluxoWorkflow_.AsEnumerable(). .Where(N…
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answers312
viewsA: Count distinct names saved in txt
Create a list of strings to save the names, validate if the name no longer exists inside the list before adding it, if it does not exist, add the name to the list. At the end of the iteration, use…
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answers1081
viewsA: Error in mysqli: "expects Exactly 2 Parameters, 1 Given"
According to the function documentation mysqli_select_db, it is necessary to pass two parameters to this function, the first being the Connection link and the second name of the database. Edit…
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answer144
viewsQ: Share types between API and client application
I am developing a REST API using ASP.NET Webapi 2 and, as I come from the old SOAP standard, I’m used to type sharing between the API and the client. That is, when referencing my service in the…
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answers222
viewsQ: Update model partially with Webapi2
I am starting to develop a REST API using ASP.NET Webapi2. In my controller, I’m using the method PATCH to apply partial changes to a model. I have a method that is this way [HttpPatch]…
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answers675
viewsA: Why can’t I declare an attribute using the var keyword?
Look, as already said in the @Maniero reply Using var doesn’t mean you can use any type, it just means you don’t need to type. In simplest terms this means that it is the compiler that chooses the…
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answer453
viewsA: Text inside a picturebox
You can use a Tooltip for that reason. First drag a ToolTip of Toolbox for your form - it will not be shown inside the form, but in a footer, see the image Now all form components have a property…
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answers461
viewsQ: Dynamically update ASMX web service reference
I have a C# application that consumes a webservice asmx (which is also developed in C#). Whenever I publish a new version of the webservice, I need to update the reference (of the webservice) in the…
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answers124
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answer159
viewsA: Output of a method or event - C# / WPF
You can use the property Handled of ValidationEventArgs. This will cause the event to stop propagating. private void textEstado_Validate(object sender, ValidationEventArgs e) { //Ação... e.Handled =…
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answer253
viewsA: Does the Netbeans Builder GUI Code affect application performance?
This depends on taste, even the question can be interpreted as mainly based on opinions. But think to me: if Netbeans does all the work of creating the interface code for you, why would you do it…
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answer1911
viewsQ: #if DEBUG always runs, even in release mode
I’m trying to use the directive #if for a given method to be executed only after publication (in release mode). The code is something like #if !DEBUG AlgumMetodo(); #endif I’ve also tried to add the…
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answer4598
viewsA: Generate Danfe from Nfe XML
In a simple Google search I found the Danzor, seems to do exactly what you need. To install it, open the Package Manager Console and type PM> Install-Package Danzor In your controller create an…
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answers1756
viewsA: C# Challenge Variable value exchange
There are many ways to do it. The first thing I thought was string a = "Teste"; string b = "Overflow"; a += "|" + b; b = a.Split('|')[0]; a = a.Split('|')[1]; WriteLine($"a = {a} - b = {b}"); The…
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answer1178
viewsA: "Input string was not in an incorrect format" when filtering array
That means you’re trying to convert to int some string other than a number. You just need to check your string carefully and discover the error. Try debugging the code, show the value on the screen…
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answers1532
viewsQ: Capture text between two known characters
I need to pick up any text and find the words (or phrases) that are between two specific characters { and }, in that case. I can do this by capturing the delimiters together, using the expression…
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answer1084
viewsA: How to calculate numbers in a C#string
Simple. string str = "#10##10##50##100#"; var listValores = str.Split('#').ToList(); listValores.RemoveAll(x => x == ""); decimal soma = 0; foreach(var v in listValores) { decimal vlr;…
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answers438
viewsA: List years in Jcombobox dynamically from certain rule
Alternatively, you create a class that provides you with a sequence based on the elements you pass per parameter to it. import java.util.Iterator; public class Range implements…
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answers426
viewsA: When should I wear the new one or not?
You need to use the new always instantiate a class, that is, create a new instance of a given object. In this case, when you create a new instance of Date it already comes with the current date. In…
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answer152
viewsA: Nullreferenceexception: Object Reference not set to an instance of an Object Motioncontroller.Fixedupdate
The problem is that the variable groundCheck is not being initialized, so the NullReferenceException This variable is being initialized within the method Start(), however, as you said in the…
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answers960
viewsQ: What is the purpose of the 'Let' statement in a LINQ query?
I have the following LINQ query: var source = from em in query select new { Id = em.UniqueID, Data = em.Data == DateTime.MinValue ? "" : em.Data.Value.ToString("dd/MM/yy HH:mm") }; The estate Data…
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answers208
viewsA: Script for modifying Bible texts (accessibility)
Here is a Python 3.1 script that does what you need, it can be improved, but so it works well. I tried to explain how it works in the comments, if you can not understand comment here below that I am…
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answers55
viewsQ: Get information stored in an "attribute"
In the ORM I use, classes are mapped using Attributes. I need to recover the value stored in them. Ex.: [Table("CADASTRO_CLIENTE")] public class Cliente { [Property("Id")] public int Id { get; set;…
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answer42
viewsA: Java problems calling an array
This is because in this line you are creating the variable I inside the block for, thus: for(int SN=0 ; SN < T ; SN++){ int N = ler.nextInt(); int I[]=new int [N]; I[SN]=ler.nextInt(); } Thus,…
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answer1329
viewsA: Error publishing C# MVC project, Could not load file or Assembly 'System.Web.Http.Webhost
The problem is that the DLL is not being copied to the server when publishing. Within the project, click References, select that DLL, right-click and Properties. Change the option Copy Local for…
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viewsA: Take a string snippet
There is no mystery, just capture the text inside the parentheses. Regex var s = Regex.Match(ex.Message, @"\(([^)]*)\)").Groups[1].Value; Regex-free string output = ex.Message.Split('(', ')')[1];…
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answer52
viewsA: Jradiobutton and Jbutton
Of course, the second way is the best way to use. If you only need to validate when the user clicks the button, you do not need to use the Radio Button.
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answers7644
viewsA: How to create a Datetime object that represents the last day of a given month?
You can use the package Fluentdatetime. It provides the extension method LastDayOfMonth() in addition to a number of other extremely useful extensions. You can install it by nuget PM>…
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answer1531
viewsA: Would it be possible to pass a string from one form to another?
Obviously you have two Forms, let’s call the main form of Form1 and the secondary of Form2 In the Form1 main you will have a button with click event similar to the below private void…
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answers1023
viewsA: Send more than one parameter in GET request
You just need to separate the variables with the character & $('#cidades').load('cidades.php?estado='+$('#estados').val()+'&recurso=seuRecurso'); If you need to use more parameters, I think…
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viewsA: Change Order by Clicking the Tab Key
You can pass the order of the fields on Html Helpers @Html.TextBoxFor(model => model.Prop, new { tabindex = 1 })
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answer733
viewsA: Check password fields with each other
The problem with your code is the operator ==. In Java == compares whether two objects point to the same reference (only for non-primitive types, of course). In your case, you should use the method…
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answers1678
viewsA: Insert image into email body
Make your email send as HTML. message.IsBodyHtml = true; message.Body = "<p>Veja essa imagem</p> <br/><br/><img src=\"cid:localDaImagem\" />"…
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answers213
viewsA: Difference between ":" and "." in the methods of a Lua table
The "two-point" serves to call self as the first function parameter. Soon obj:GoGoGo(name) must be the same thing as obj.GoGoGo(obj, name). I saw it in an OR response a while back, but I couldn’t…
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answers502
viewsA: Empty semicolon doesn’t make a mistake?
The semicolon serves to determine the end of an instruction. What happens in this case is that "the instruction" does nothing. Do this: if(true) { }; is the same thing as doing if(true) { } ;…
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answer2193
viewsA: How to install the moon via terminal in Ubuntu?
You need to specify the version you want to install. Something like $> sudo apt-get install lua5.2 Behold: http://packages.ubuntu.com/search?keywords=lua5.2…
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answers4976
viewsA: Remove the time part of a date in c#
First of all, the date format is wrong. It should be dd/MM/yyyy and not dd/mm/yyyy, this way you’re taking the minutes instead of the month. Source: Custom Date and Time Format Strings The problem…
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answer1372
viewsA: Convert binary to hexadecimal
You can do it like this String hexa = Integer.toString(Integer.parseInt("1111", 2), 16); And hexadecimal to binary as well String bin = Integer.toString(Integer.parseInt("ff", 16), 2);…
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viewsA: Close the panel when the mouse exits from the top
Use the event MouseLeave - it is fired whenever the mouse cursor gets off the control. private void panel_MouseLeave(object sender, EventArgs e) { panel.Visible = false; }…
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answers63
viewsA: "Nullreferenceexeption error was unhandled" when compiling
You excluded the method InitializeComponent() which should be called in the form constructor. This method is declared in the other part of the class (note that the class has the modifier partial),…
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answer301
viewsA: What to use to create web site and android app
There is no way to give you the path of the stones and say: "do this, this and more and you will have everything you need", until I find it strange the question has no vote to be closed as too wide…
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answers1086
viewsA: How to reference an external library?
This varies somewhat according to the taste of the developer(s) of the project. Nuget When installing a package with nuget, there are some advantages. The main ones are: It’s (very) simple to update…
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viewsA: Receive null int in Razor (@Html.Textboxfor)
Simple, do not pass null to the TextBox. @Html.TexboxFor(model => model.AnoInspecao ?? "") or @Html.TexboxFor(model => model.AnoInspecao != null ? model.AnoInspecao.ToString() : "") The…
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viewsQ: What is a programming language, IDE and compiler?
Starting in programming is not always easy, besides having to learn to "write the code", there are dozens of terms, technologies, among other things that need to be studied. In order to help those…