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  3. c# Casting v As operator

c# Casting v As operator

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  • N Nagy Vilmos

    There seems to be alot of white space in your sig.


    Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

    W Offline
    W Offline
    W Balboos GHB
    wrote on last edited by
    #31

    Possibly a font-problem on your end? It looks roughly like: W**.'.** Balboos - the three punctuation-like characters being the HTML character code: & there4; (space put in after & so it doesn't render)

    "The difference between genius and stupidity is that genius has its limits." - Albert Einstein

    "As far as we know, our computer has never had an undetected error." - Weisert

    "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010

    N 1 Reply Last reply
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    • A Aamir Butt

      Norm .net wrote:

      wow you needed a ton of code to do a small task

      Check the section "Master Programmer" in this link. :)[^]

      A year spent in artificial intelligence is enough to make one believe in God

      N Offline
      N Offline
      NormDroid
      wrote on last edited by
      #32

      Oh that brings back memories, and forgetting idl files :)

      www.software-kinetics.co.uk Wear a hard hat it's under construction

      1 Reply Last reply
      0
      • W W Balboos GHB

        Possibly a font-problem on your end? It looks roughly like: W**.'.** Balboos - the three punctuation-like characters being the HTML character code: & there4; (space put in after & so it doesn't render)

        "The difference between genius and stupidity is that genius has its limits." - Albert Einstein

        "As far as we know, our computer has never had an undetected error." - Weisert

        "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010

        N Offline
        N Offline
        Nagy Vilmos
        wrote on last edited by
        #33

        Not your name, your sig:

        W∴ Balboos wrote:

        Possibly a font-problem on your end?
         
        It looks roughly like: W**.'.** Balboos - the three punctuation-like characters being the HTML character code: & there4; (space put in after & so it doesn't render)

        "The difference between genius and stupidity is that genius has its limits." - Albert Einstein

        "As far as we know, our computer has never had an undetected error." - Weisert

        "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010

        There's a lot of white space...


        Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

        S W 2 Replies Last reply
        0
        • N NormDroid

          It's a debate, not a question.

          www.software-kinetics.co.uk Wear a hard hat it's under construction

          N Offline
          N Offline
          Nagy Vilmos
          wrote on last edited by
          #34

          To be or not to be.? That is a question. :-D


          Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

          N 1 Reply Last reply
          0
          • N Nagy Vilmos

            To be or not to be.? That is a question. :-D


            Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

            N Offline
            N Offline
            NormDroid
            wrote on last edited by
            #35

            Nope wrong, you've omitted the ? mark. ;)

            www.software-kinetics.co.uk Wear a hard hat it's under construction

            N 1 Reply Last reply
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            • N NormDroid

              Nope wrong, you've omitted the ? mark. ;)

              www.software-kinetics.co.uk Wear a hard hat it's under construction

              N Offline
              N Offline
              Nagy Vilmos
              wrote on last edited by
              #36

              Did I?


              Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

              N 1 Reply Last reply
              0
              • N Nagy Vilmos

                Did I?


                Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

                N Offline
                N Offline
                NormDroid
                wrote on last edited by
                #37

                The hand is quicker than the I eye.

                www.software-kinetics.co.uk Wear a hard hat it's under construction

                S 1 Reply Last reply
                0
                • N NormDroid

                  a. Throw back from C++ programming.

                  www.software-kinetics.co.uk Wear a hard hat it's under construction

                  Q Offline
                  Q Offline
                  Quirkafleeg
                  wrote on last edited by
                  #38

                  Wrong - a is C-style casting, not C++

                  N S 2 Replies Last reply
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                  • Q Quirkafleeg

                    Wrong - a is C-style casting, not C++

                    N Offline
                    N Offline
                    NormDroid
                    wrote on last edited by
                    #39

                    Splitting hairs :)

                    www.software-kinetics.co.uk Wear a hard hat it's under construction

                    R 1 Reply Last reply
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                    • N Nagy Vilmos

                      Norm .net wrote:

                      Good point.

                      Holy cr_p! I'm going to the pub, we'll see what comes out after lunch! :laugh:


                      Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

                      N Offline
                      N Offline
                      NormDroid
                      wrote on last edited by
                      #40

                      :beer:

                      www.software-kinetics.co.uk Wear a hard hat it's under construction

                      N 1 Reply Last reply
                      0
                      • H hairy_hats

                        Which is exactly why this is more of a programming question than a "lifestyle choice" question.

                        N Offline
                        N Offline
                        NormDroid
                        wrote on last edited by
                        #41

                        I'd say more of a debate, but as we all know rules of the lounge, I'd say just go along with it and chill :)

                        www.software-kinetics.co.uk Wear a hard hat it's under construction

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                        • N NormDroid

                          True, but you should know beforehand if the casting is correct.

                          www.software-kinetics.co.uk Wear a hard hat it's under construction

                          F Offline
                          F Offline
                          Fabio Franco
                          wrote on last edited by
                          #42

                          If you do know something is not gonna be null, the cast is more efficient.

                          N 1 Reply Last reply
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                          • N NormDroid

                            For those using c#, what do you prefer? A.

                            SomeObject obj = (SomeObject) e;

                            or B.

                            SomeObject obj = e as SomeObject;

                            www.software-kinetics.co.uk Wear a hard hat it's under construction

                            S Offline
                            S Offline
                            Sahir Shah
                            wrote on last edited by
                            #43

                            The second one sounds like some kind of hominid comrade Norm.

                            Und wenn du lange in einen abgrund blickst, blickt der Abgrund auch in dich hinein.

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                            0
                            • F Fabio Franco

                              If you do know something is not gonna be null, the cast is more efficient.

                              N Offline
                              N Offline
                              NormDroid
                              wrote on last edited by
                              #44

                              To add... and the cast is a qualified cast.

                              www.software-kinetics.co.uk Wear a hard hat it's under construction

                              1 Reply Last reply
                              0
                              • S Sahir Shah

                                The second one sounds like some kind of hominid comrade Norm.

                                Und wenn du lange in einen abgrund blickst, blickt der Abgrund auch in dich hinein.

                                N Offline
                                N Offline
                                NormDroid
                                wrote on last edited by
                                #45

                                Don't fancy seeing your code if you think b. looks like a great ape :rolleyes:

                                www.software-kinetics.co.uk Wear a hard hat it's under construction

                                S 1 Reply Last reply
                                0
                                • N NormDroid

                                  For those using c#, what do you prefer? A.

                                  SomeObject obj = (SomeObject) e;

                                  or B.

                                  SomeObject obj = e as SomeObject;

                                  www.software-kinetics.co.uk Wear a hard hat it's under construction

                                  OriginalGriffO Offline
                                  OriginalGriffO Offline
                                  OriginalGriff
                                  wrote on last edited by
                                  #46

                                  B. I don't like to rely on exceptions for normal processing (they are slow and clumsy for that), so you have to check for null.

                                  SomeObject obj = e as SomeObject;
                                  if (obj != null)
                                  {
                                  ...
                                  }

                                  While

                                  if (e != null && e is SomeObject)
                                  {
                                  SomeObject obj = (SomeObject) e;
                                  ...
                                  }

                                  looks ugly. Plus, if you are going to use obj as a SomeObject instance, then the former is quicker since there is only one check on the type of e

                                  Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together. Manfred R. Bihy: "Looks as if OP is learning resistant."

                                  "I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
                                  "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt

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                                  • R Ravi Bhavnani

                                    It depends.  (A) will throw if the cast fails while (B) will evaluate to null if the cast fails.  I use both depending on how I intend to handle the casting failure. /ravi

                                    My new year resolution: 2048 x 1536 Home | Articles | My .NET bits | Freeware ravib(at)ravib(dot)com

                                    J Offline
                                    J Offline
                                    jim lahey
                                    wrote on last edited by
                                    #47

                                    I'm with Ravi on this one.I use both, the decision if which one to use is purely based upon what I need to happen should it go wrong

                                    1 Reply Last reply
                                    0
                                    • N Nagy Vilmos

                                      Not your name, your sig:

                                      W∴ Balboos wrote:

                                      Possibly a font-problem on your end?
                                       
                                      It looks roughly like: W**.'.** Balboos - the three punctuation-like characters being the HTML character code: & there4; (space put in after & so it doesn't render)

                                      "The difference between genius and stupidity is that genius has its limits." - Albert Einstein

                                      "As far as we know, our computer has never had an undetected error." - Weisert

                                      "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010

                                      There's a lot of white space...


                                      Panic, Chaos, Destruction. My work here is done. Drink. Get drunk. Fall over - P O'H OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

                                      S Offline
                                      S Offline
                                      Sahir Shah
                                      wrote on last edited by
                                      #48

                                      He's doin it on purpose to annoy you Senhor Vilmos. I thought you would have figured that out by now :D

                                      Und wenn du lange in einen abgrund blickst, blickt der Abgrund auch in dich hinein.

                                      1 Reply Last reply
                                      0
                                      • N NormDroid

                                        For those using c#, what do you prefer? A.

                                        SomeObject obj = (SomeObject) e;

                                        or B.

                                        SomeObject obj = e as SomeObject;

                                        www.software-kinetics.co.uk Wear a hard hat it's under construction

                                        N Offline
                                        N Offline
                                        Nemanja Trifunovic
                                        wrote on last edited by
                                        #49

                                        It is not about preference. When I want an exception in case of type error I use A., and if I want a null I use B. I don't see a point of something like:

                                        SomeObj obj = e as SomeObject;
                                        if (obj == null)
                                        throw new InvalidCastException();

                                        Of course, in good languages casting is almost always a sign of a design error.

                                        utf8-cpp

                                        P 1 Reply Last reply
                                        0
                                        • R Richard A Dalton

                                          If an illegal cast is an exceptional (woah, that should never happen) situation, then (a) If there's a possibility that through normal use the cast might be invalid (e.g. Plug-in tpye code), then (b), followed by an If to check for Null. -Richard

                                          Hit any user to continue.

                                          P Offline
                                          P Offline
                                          PIEBALDconsult
                                          wrote on last edited by
                                          #50

                                          Richard A. Dalton wrote:

                                          Plug-in tpye code

                                          I don't have such problems with plug-ins.

                                          P 1 Reply Last reply
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