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Showing posts with label Environment.NewLine. Show all posts
Showing posts with label Environment.NewLine. Show all posts

Thursday, 15 December 2011

Environment.NewLine or "\r\n"

Posted on 07:38 by Unknown
Ma uitam zilele astea peste un cod si am vazut de mai multe ori cod de genul acesta:
string v2 = v1 + "\n";
Scopul la acest cod este de a trece pe o linie noua. Desi functioneaza si este folosit de catre foarte multi dezvoltatori nu este cea mai buna solutie. Pentru a trece la o linie noua cei de la Microsoft au adaugat o propietatea Environment.NewLine. De fapt aceasta este o constanta ce ne returneaza "\r\n" pe Windows.
IL care se genereaza face un call la System.Environment::get_NewLine() care in spate are urmatoarea implementare pentru Windows:
.method public hidebysig specialname static string get_NewLine() cil managed
{
.maxstack 8
L_0000: ldstr "\r\n"
L_0005: ret
}
In functie de platforma NewLine poate sa difere, o implementare pentru UNIX ar contine doar "\n". Desii Environment.NewLine este mult mai clar in cod, nu cred ca se va renunta la "\r\n" deoarece nimeni nu va uita ce inseamna "\r" sau "\n". Pana se va ajunge sa se scrie aplicatii .NET care sa ruleze by default pe mai multe sisteme de operare o sa mai treaca ceva vreme.
Eu prefer si incerc sa folosesc Environment.NewLine, voi ce folositi?

Update:
Un caz cand nu se poate folosii NewLine este cand vrem sa declaram o constanta care sa contina si NewLine:
const string Text = "Hello" + Environment.NewLine + "Word!";
Din cauza ca NewLine este o propietate si nu o contanta linia de cod scrisa mai sus o sa crape.
Daca lucram cu un TextBox o sa ne trezim ca urmatoarea linie de cod nu ne da rezultatul pe care l-am astepta:
errorTextBox.Text = "Error: \n\n\";
Problema este ca TextBox-ul necesita si un CRLF, nu doar LF. In acest caz avem posibilitati:
errorTextBox.Text = "Error: \r\n\r\n\";
sau
errorTextBox.Text = "Error: "+ Environment.NewLine + Environment.NewLine ;

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