{"id":633,"date":"2004-09-22T21:18:51","date_gmt":"2004-09-23T01:18:51","guid":{"rendered":"http:\/\/wordpress.cephas.net\/?p=633"},"modified":"2004-09-22T21:18:51","modified_gmt":"2004-09-23T01:18:51","slug":"the-using-keyword","status":"publish","type":"post","link":"https:\/\/cephas.net\/blog\/2004\/09\/22\/the-using-keyword\/","title":{"rendered":"The ‘using’ keyword"},"content":{"rendered":"

Joe pointed out that the C# PGP decryption code<\/a> that I wrote could be better; specifically I should be checking the xExitCode property of the Process instance<\/a> and the code would also be better served if I made certain that I disposed of the Process instance by calling the Close() method<\/a> when I’m done using it. The ExitCode improvement is relatively simple to add; start the process, read any lines of output and then check the ExitCode to see if everything went smoothly:
\n
\nProcess process = Process.Start(psi);
\n...
\nwhile(!process.HasExited) {
\n\t... \/\/ do stuff
\n}
\nif (process.ExitCode != 0) {
\n\t\/\/ something went wrong..
\n}
\n<\/code>
\nThe second thing that Joe mentioned was the ‘using’ statement<\/a>, which is a novel feature of C# that provides “… an easy way for C# code to acquire and release unmanaged or otherwise precious resources.” The code I originally wrote didn’t destroy the handle to the process; after all was said and done I should have called the Close() or Dispose() method of the process:
\n
\nProcess process;
\ntry {
\n\tprocess = Process.Start(psi);
\n\t...
\n} catch {
\n\tprocess.Close();
\n}
\n<\/code>
\nThe ‘using’ statement is syntactic sugar that’s a shortcut for the well worn try \/ catch idiom and shortens the above example to:
\n
\nusing (Process process = Process.Start(psi)) {
\n\t... \/\/ do stuff w\/ the process
\n}
\n<\/code>
\nwhich then automatically calls the Dispose() method of the process.<\/p>\n

Joe goes on to hijack the ‘using’ statement in some other novel ways which should you check out when you have a chance<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Joe pointed out that the C# PGP decryption code that I wrote could be better; specifically I should be checking the xExitCode property of the Process instance and the code would also be better served if I made certain that I disposed of the Process instance by calling the Close() method when I’m done using … Continue reading The ‘using’ keyword<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[17,2],"tags":[],"_links":{"self":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts\/633"}],"collection":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/comments?post=633"}],"version-history":[{"count":0,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts\/633\/revisions"}],"wp:attachment":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/media?parent=633"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/categories?post=633"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/tags?post=633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}