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DbContext.Set<t>(grunts) ♪ Attach(entity)</t>

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Duquan last edited by

The question is: Will the Attach method update my essence? In other words, would the list be updated in the table after the attach and the context changes continued?
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meriah last edited by

When you're calling DbSet.Atach, you're telling EF that "that's what's already in the OBD system, you don't have to put it in the base." If we call SaveChanges then nothing happens, the essence will not be changed (in the Unchanged status). That's right in the jump.
https://msdn.microsoft.com/en-us/library/system.data.entity.dbset.attach(v=vs.113).aspx
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Software Programming • mysql c sharp • • Avante

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For the C# language, there is a mass of different ORMs to facilitate interaction with the OBD: https://docs.microsoft.com/en-us/ef/ https://nhibernate.info/ https://dapper-plus.net//?gclid=Cj0KCQiAiNnuBRD3ARIsAM8KmltENli8g2O8jj1bntXG8MsuHzcMLSnSWXQw1qoioon5aGZtJWcF_XkaAv30EALw_wcB There are also different conjectors to connect to MySQL/MariaDBThe dapper has a ready realization. https://dapper.phnx47.net/
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I used a parser to generate an object that allows working with the text in XML format:const parser = new DOMParser(); const xmlDoc = parser.parseFromString(this.mockXml, "text/xml");
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From the general point of view this is wrong, but pay attention because now I will speak of what is common to do, then I explain that DbContext It's special.Every class that implements IDisposable must call Dispose() somehow. O using is the most obvious form within methods. When it is part of an object, regardless of how it was placed there (Condependence Injection does not solve the problem by itself), this object needs to implement IDisposable and something needs to call Dispose() of this somewhere (some frameworks could do this for you). No Dispose() of your class need to call Dispose() the DbContext or other classes that implement IDdisposableI mean, he's viral.When you don't call Dispose() the object is dropped there until the garbage collector Call the method for you. Is that the end of the world? For certain objects no, and as far as I know the DbContext It's not tragic. But it is not the ideal way, it is consuming resources without need. I don't know if I'd give a problem in some competing code, but I believe not, for what I saw out there.If what you use calls that code and dies shortly afterwards, that is, it is an ephemeral execution, typical of script, so this really won't cause a problem, even if it's not ideal. But if something is running for a long time, it may be that at some point may have some memory problem.As most of the time it works, people think it's right.The thick way should create something like this:protected IDbContext GameDbContext {get;} protected virtual void Dispose(bool disposing) { if (!disposedValue) { if (disposing) GameDbContext.Dispose(); disposedValue = true; } } public void Dispose => Dispose(true); https://github.com/maniero/SOpt/blob/master/CSharp/Class/Dispose.cs .The specific recommendation for DbContext is that it is used only within methods, so if you do it you do not need to worry about it. If you don't, you should know why you're avoiding doing what's recommended. If you don't know, don't.O DbContext manages your feature (the connection with the database) on your own, so what is most important to do as soon as you finish your use it already solves, so letting the object loose is not a big problem. Then any access that is to make it opens and closes the connection by you. If he has this behavior, why do you think it's so important to keep the object in class instead of creating it only at the time you're going to use it?In fact there are those who recommend or use using with DbContext. And if you should not in something so specific, in the class should also not discard the object. Particularly I don't like to treat certain objects with certain features like exceptions, but it makes some sense. Maybe DbContext or should have implemented IDisposable (feeling why it was).In fact, when using Dependency Injection it is common that the object is not discarded (depends on how it uses DI). And it's not the end of the world.I can understand the motivation to use this and it doesn't seem to have problems. But it is not wrong to do right I just wouldn't know how to say what is more efficient (although it doesn't change much).I have also seen who speaks the opposite of all this, I will not confirm, nor deny, take your own conclusions by reading https://ardalis.com/avoid-wrapping-dbcontext-in-using/ . Remember that this is a different position until the Entity Framework team recommends. But it makes some sense.
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Okay, I've solved it this way... I think the foreach and the infinite loops are incompatible.public void ResetStates() { if (state.Count <= 0) return; for (int index = 0; index < state.Count; index++) { var item = state.ElementAt(index); state[item.Key] = false; } } Here's in case someone helps.
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That's what you said in the window of the answer.var rand = new Random(); var area = Screen.PrimaryScreen.WorkingArea; this.Left = rand.Next(area.Left, area.Right - this.Width); this.Top = rand.Next(area.Top, area.Bottom - this.Height);
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new string ToString()notoverride string ToString() .From DataGridView, you probably need to make it visible from it because ToString is called as an object type.override and new http://gacken.com/wp/program/c-sharp/2692/
Can I set the value by dynamically specifying the property name of the C# entity model?
Software Programming • c sharp mvc • • Analeea

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System.ReflectionYou can use it.Yes, but it can be readable, run speed and error when running, so it is highly recommended to consider how to respond well with arrays and Dictionary before using Reference.using System; namespace ConsoleApplication1 { public class Table_sample { public string num01 { get; set; } public string num02 { get; set; } public string num03 { get; set; } } class Program { static void Main(string[] args) { var tbl = new Table_sample(); for (var i = 1; i <= 3; i++) { //列名を動的に指定する var property = tbl.GetType().GetProperty(string.Format("num{0:D2}", i)); property.SetValue(tbl, string.Format("{0}番目の数値", i)); } //答え合わせ Console.WriteLine(tbl.num01); Console.WriteLine(tbl.num02); Console.WriteLine(tbl.num03); } } }
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Software Programming • php • • obi

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There is a standard function for converting special character entities. http://php.net/manual/ja/function.htmlspecialchars.php function a() { $str = ' class="name"'; echo htmlspecialchars('<pre'.$str.'><code>'.'</code></pre>'); }
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Software Programming • swift3 • • juvenalb

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Already inagonagonsoftware's comments, but just a little more.NSMakeRange(0, 10)The range expressed by:|<------------- len = 10 ------------->| 長さが10 [ 0][ 1][ 2][ 3][ 4][ 5][ 6][ 7][ 8][ 9][10][11]... ↑loc(開始位置)が0 Swift..<The operator(開始位置)..<(終了位置の次)to indicate the same range as above.0..<10must beIn general,NSMakeRange(loc, len) The scope expressed in (Range<Int>Home..<andloc..<loc+len Contact
Kinesis ->でのda -> DynamoDB
Software Programming • aws aws lambda amazon dynamodb • • Alberto

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I solved the problem by writing multiple data received in。da to Dynamo.-- This answer was originally written as a community wiki.
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Can you set the value of an attribute by calling another function other than set?
Software Programming • php functions poo set • • shizuka

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Your question seems ambiguous to me, in the title questions by set and in the body questions by get. However the method you comment does not perform either of the two actions, as it does not expect any parameter or return any value, where you put:public function setCuentaUsuario(){ $this->cuentaUsuario=$cuentaUsuario; } You should change it by:public function setCuentaUsuario($cuentaUsuario){ $this->cuentaUsuario=$cuentaUsuario; return $this->cuentaUsuario; } And responding to the title taken literally, the answer would be Yesany method of the class can modify the value of a variable if it is https://www.php.net/manual/es/language.oop5.visibility.php for example:public function importar_usuario($datosUsuario){ $this->cuentaUsuario=$datosUsuario->cuenta; // .... return true; }
Application of Monad Law in Haskell(>>=)
Software Programming • haskell • • Bogopo

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On the other hand, implement f to meet the monad rule, and you can use it without any problem (>>=) or do notation.
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Difference between this and x:Name when using DataContext
Software Programming • c sharp wpf xaml • • shizuka

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It is not the right style to change the DataContext itself se。tially.If you change this.DataContext itself, you will be notified of changes to all controls at the bottom.When using data binding, let’s assign and use an object that implements INotifyPropertyChanged in DataContext. Data bound controls always monitor changes in properties. If you throw a change notification, the control side will follow the change.// NotificationObjectは実装を探して見てください。ここでは割愛します。 public class SamplePresenter : NotificationObject { public int ButtonContentA { get { return _ButtonContentA; } set { if (_ButtonContentA != value) { _ButtonContentA = value; // ここでPropertyChangedEventArgs("ButtonContentA")が // 通知されると思ってください RaisePropertyChanged("ButtonContentA"); } } } private int _ButtonContentA; } public partial class SampleWindow : Window { // 少し手抜きですが以下のようにバインドされていたとして public SampleWindow() { this.DataContext = Presenter = new SamplePresenter(); } public SamplePresenter Presenter { get; set; } void Worker_ProgressChangedA(object sender, System.ComponentModel.ProgressChangedEventArgs e) { //スレッドからPresenterの値を更新します this.Presenter.ButtonContentA = e.ProgressPercentage; } }
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Hashtable, your key.
Software Programming • c sharp • • Jolied

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Your method public void ShowElements() should look, for example, as follows:public void ShowElements() { foreach (DictionaryEntry s in internalHashtable) Console.WriteLine("{0}:\t{1}", s.Key, s.Value); }
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Perform peticion a webservice made C# by PHP
Software Programming • php c sharp xml curl webservic languagee • • jonetta

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Well after a lot of searching and trying I found the solution, and I'll leave it here for someone to serve you in the future, and it's just that I realized that many webservices are made in C# and little is documented for use with PHP.Well I'll explain a little by taking as an example the previous code to show the faults I had...Use CURL PHP to make the request to the webservice done on C#.First it was not necessary to convert ASCII or use base64_encode, my mistake was to think that as in C# when sending in the header the user and password encoding, I also had to do it in php, but rather it is in a property that comes in httpwebrequest de C#. In PHP CURLOPT_USERPWD already does.And here I have the code lines that make the request to the webservice and return the expected result.//El webservice me pide los parámetros en formato de xml (no en un array como inicialmente lo estaba haciendo con $params), en este caso los parámetros son "siteId y sId" lo armo el xml y lo meto en una variable $xml. $xml = "<?xml version="1.0"?>\n"; $xml.= "<GServicesGM>"; $xml.= "<siteId>3</siteId>"; $xml.= "<sId>0</sId>"; $xml.= "</GServicesGM>"; //Esta parte es el Header de la petición por POST try{ // La variable $ch contiene toda la información que nos requiere el webservice para darnos una respuesta, aqui primeramente la URL del webservice al abrir el curl_init. $ch = curl_init('http://api.tuulbax.com/service.svc/getServicesGM'); // Aquí definimos que la petición es por POST. curl_setopt($ch, CURLOPT_POST, true); // Aquí enviamos la petición atraves del header, misma que nos pide el tipo de documento que pide el webservice, en este caso es un XML, y es importante poner el atributo Content-length, ya que de no ponerlo regresa un error, yo lo calculo con strlen. curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type: application/xml','Content-length:'.strlen($xml))); // Aquí ponemos los parámetros o datos que espera recibir el webservice en este caso es "siteId y sId" que los estamos enviando en un xml. curl_setopt($ch, CURLOPT_POSTFIELDS, $xml); //Aquí indicamos que esperamos nos retorne el resultado curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //Aquí ponemos el usuario y password que nos pide el webservice para autentificarnos. curl_setopt($ch, CURLOPT_USERPWD, 'myuser:mypass'); }catch(Exception $e){ print_r($e); } $response = curl_exec($ch); //Identifico el código que regresa el servidor, entre ellos puede estar el 500 de error, el 401 que es acceso denegado o el 200 que es de éxito. $status = curl_getinfo($ch, CURLINFO_HTTP_CODE); if (curl_error($ch)) { echo "ERROR : ".curl_error($ch); } curl_close($ch); // Guardo la respuesta del webservice en un archivo físico XML $new_xml = fopen ("./soap-response.xml", "w"); fwrite($new_xml, $response); fclose($new_xml); print_r($response);

DbContext.Set<t>(grunts) ♪ Attach(entity)</t>

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