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Showing posts with label extension. Show all posts
Showing posts with label extension. Show all posts

Tuesday, 20 March 2012

Can we mock an extension method?

Posted on 08:47 by Unknown
Pentru teste mai mult ca sigur ati folosit un framework petru a face mock pe diferite obiecte. In general am folosit Moq pentru a putea face mock la date. Este destul de usor de folosit, mai jos puteti sa gasiti un exemplu:
Mock<IService> serviceMock = new Mock<IService>();
serviceMock
.Setup(x=>x.Call(It.IsAny<string>))
.Returns(()=> new Result());
Mai sus am creat un mock pentru IService, iar in momentul in care se apeleaza metoda Call cu orice parametru de tip string, se returneaza un nou obiect de tip Result.
Nimic deosebit pana acuma. Dar ce se intampla daca vrem sa facem mock la un extension method. Vestea proasta este ca nu se poate face. Majoritatea framework-urilor pentru mock-ing nu suporta aceasta functionalitate.
Cea mai buna solutie este sa refactorizam codul daca putem. Dar exista cazuri cand acest lucru nu il putem face sau extension method nu este declarat de noi si vine dintr-un assembly exterior.
O solutie comuna, care poate sa fie folosita atat pentru aplicatiile .NET classic, Silverlight, WP7, ... este sa injectam actiunea care apeleaza metoda noastra. De exemplu putem sa extragem intr-un Action actiunea care apeleaza extension method, iar aceasta sa fie injectata prin contructor folosind un factory de exemplu. O alta varianta este sa facem un wrapper peste clasa noastra.
Urmatoarea solutie nu functioneaza pe Silverlight din pacate. Ar fi fost nice sa fie suportatat macar in versiunea 5, dar nici o sansa. Solutie se refera la folosirea Microsoft Moles. Prin intermediul acestui framework putem sa inlocuim orice clasa, metoda cu un mole care sa faca ce vrem noi. Un mole, intercepteaza apelul spre o anumita metoda si se poate executa orice alt cod. Putem sa facem mole la orice fel de metoda, atat statica cat si extension method.
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Posted in extension, method | No comments

Friday, 11 November 2011

Visual Studio 2010 extensions

Posted on 04:16 by Unknown
Zilele acestea am fost constrans de un upgrade la OS care mi-a omorat masina sa instalez de la 0 toate aplicatiile. Mai jos o sa gasiti lista de extensii pentru Visual Studio 2010 pe care le folosesc:
  • Code alligment - il folosesc cand am nevoie sa aliniez codul dupa un anumit caracter( de exemplu cand trebuie sa aliniez cateva linii de cod dupa '=').
  • Indent Guides - traseaza linii verticale pentru fiecare nivel de intentare in parte.
  • PowerCommands for Visual Studio 2010 -  mai multe comenzi pe partea de management la proiecte si soluții.
  • Productivity Power Tool - cel mai mare plus care l-a adus pentru mine a fost fereastra de add/remove references.
  • Spell Checker - face check la spelling pentru string-uri, comnent-uri si plain text.
  • VSCommands 2010 - coloreaza diferit codul scris iar cand dam click dreapta pe un fiser/director/proiect/solutie ne ofera noi functionalitati precum: deschidere CMD cu path-ul setat in directorul curent, copy class, copy full path etc.
Enjoy!
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Posted in extension, visual studio | No comments

Monday, 31 January 2011

Cum sa salvezi un stream direct intr-un fisier

Posted on 14:51 by Unknown
Cred ca este a 2-a oara când întâlnesc aceasta cerința in decurs de câteva săptămâni.
Se da un stream și o locație unde trebuie salvat, se cere să se salveze conținutul la stream in locația data. Din păcate API-ul de .NET nu ne permite să facem acest lucru doar dintr-un apel.
O soluție propusa este următoarea:
        /// <summary>
/// Save the stream to the given location.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="filePath">The file path where is saved.</param>
/// <param name="blockSize">The size of the buffer(in kB)</param>
public static void SaveStream(this Stream stream,String filePath,SeekOrigin seekOrigin=SeekOrigin.Begin,int blockSize=1)
{
//Set the poinder to the begin of the stream.
if(stream.CanSeek && seekOrigin==SeekOrigin.Begin)
{
stream.Seek(0, SeekOrigin.Begin);
}

//Removed the existing file.
if (File.Exists(CommandLineArguments.Instance.File))
{
File.Delete(CommandLineArguments.Instance.File);
}

//Save the stream to the given location.
using (var streamWrite = File.Create(CommandLineArguments.Instance.File))
{
byte[] buffer = new byte[1024*blockSize];
int read;

while ((read = stream.Read(buffer, 0, buffer.Length)) > 0)
{
streamWrite.Write(buffer, 0, read);
}
}
}
Iar un exemplu de utilizare:
Stream stream=...;
stream.Save("d:/a.txt");
In funcție de necesitați acest exemplu se poate extinde. Din păcate nu putem să facem un extension method pe File deoarece este o clasa statica.
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Posted in extension, method, salvare in fisier, stream | No comments
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