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  4. What this 'null' check doing here...

What this 'null' check doing here...

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  • M Offline
    M Offline
    Mohammed Hameed
    wrote on last edited by
    #1

    List<Employee> employees = new List<Employee>();

    if (employees != null){
    employees = GetEmployees();
    }

    Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

    P V P N T 16 Replies Last reply
    0
    • M Mohammed Hameed

      List<Employee> employees = new List<Employee>();

      if (employees != null){
      employees = GetEmployees();
      }

      Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

      P Offline
      P Offline
      Pete OHanlon
      wrote on last edited by
      #2

      Is this inside a single method? I'd be more concerned here with the fact you'd never fill the employees list.

      I was brought up to respect my elders. I don't respect many people nowadays.
      CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

      M 1 Reply Last reply
      0
      • M Mohammed Hameed

        List<Employee> employees = new List<Employee>();

        if (employees != null){
        employees = GetEmployees();
        }

        Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

        P Offline
        P Offline
        peterchen
        wrote on last edited by
        #3

        Keeping the runtime on its toes.

        ORDER BY what user wants

        M J E 3 Replies Last reply
        0
        • M Mohammed Hameed

          List<Employee> employees = new List<Employee>();

          if (employees != null){
          employees = GetEmployees();
          }

          Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

          V Offline
          V Offline
          VallarasuS
          wrote on last edited by
          #4

          Guess he don't believe the guys at microsoft! :laugh:

          Regards Vallarasu S | BreakingDotNet.blogspot.com

          M 1 Reply Last reply
          0
          • P peterchen

            Keeping the runtime on its toes.

            ORDER BY what user wants

            M Offline
            M Offline
            Mohammed Hameed
            wrote on last edited by
            #5

            True...:cool:

            Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

            1 Reply Last reply
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            • V VallarasuS

              Guess he don't believe the guys at microsoft! :laugh:

              Regards Vallarasu S | BreakingDotNet.blogspot.com

              M Offline
              M Offline
              Mohammed Hameed
              wrote on last edited by
              #6

              Then, he must be a Genius ;P

              Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

              1 Reply Last reply
              0
              • P Pete OHanlon

                Is this inside a single method? I'd be more concerned here with the fact you'd never fill the employees list.

                I was brought up to respect my elders. I don't respect many people nowadays.
                CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

                M Offline
                M Offline
                Mohammed Hameed
                wrote on last edited by
                #7

                Quote:

                Is this inside a single method?

                Yes, it is.

                Quote:

                I'd be more concerned here with the fact you'd never fill the employees list.

                How??

                Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                P B 2 Replies Last reply
                0
                • M Mohammed Hameed

                  Quote:

                  Is this inside a single method?

                  Yes, it is.

                  Quote:

                  I'd be more concerned here with the fact you'd never fill the employees list.

                  How??

                  Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                  P Offline
                  P Offline
                  Pete OHanlon
                  wrote on last edited by
                  #8

                  Never mind - I've been up for the last 16 hours. I was reading != as == here for some reason. :doh:

                  I was brought up to respect my elders. I don't respect many people nowadays.
                  CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

                  M K 2 Replies Last reply
                  0
                  • P Pete OHanlon

                    Never mind - I've been up for the last 16 hours. I was reading != as == here for some reason. :doh:

                    I was brought up to respect my elders. I don't respect many people nowadays.
                    CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

                    M Offline
                    M Offline
                    Mohammed Hameed
                    wrote on last edited by
                    #9

                    Ohh, that's okay...

                    Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                    1 Reply Last reply
                    0
                    • P peterchen

                      Keeping the runtime on its toes.

                      ORDER BY what user wants

                      J Offline
                      J Offline
                      jim lahey
                      wrote on last edited by
                      #10

                      I hope there's a unit test for that too.

                      1 Reply Last reply
                      0
                      • M Mohammed Hameed

                        List<Employee> employees = new List<Employee>();

                        if (employees != null){
                        employees = GetEmployees();
                        }

                        Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                        N Offline
                        N Offline
                        Nicholas Marty
                        wrote on last edited by
                        #11

                        Hm. and why even initialize the variable if you're going to assign another value anyway?

                        M 1 Reply Last reply
                        0
                        • M Mohammed Hameed

                          List<Employee> employees = new List<Employee>();

                          if (employees != null){
                          employees = GetEmployees();
                          }

                          Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                          T Offline
                          T Offline
                          Trajan McGill
                          wrote on last edited by
                          #12

                          And what is the " = new List()" doing there, either? Assign it one value, then if it isn't null, which it can't be, immediately assign it another value and discard the first object? Goofy.

                          M 1 Reply Last reply
                          0
                          • T Trajan McGill

                            And what is the " = new List()" doing there, either? Assign it one value, then if it isn't null, which it can't be, immediately assign it another value and discard the first object? Goofy.

                            M Offline
                            M Offline
                            Mohammed Hameed
                            wrote on last edited by
                            #13

                            Thanks for raising this point.

                            Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                            1 Reply Last reply
                            0
                            • N Nicholas Marty

                              Hm. and why even initialize the variable if you're going to assign another value anyway?

                              M Offline
                              M Offline
                              Mohammed Hameed
                              wrote on last edited by
                              #14

                              Thanks.

                              Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                              1 Reply Last reply
                              0
                              • M Mohammed Hameed

                                List<Employee> employees = new List<Employee>();

                                if (employees != null){
                                employees = GetEmployees();
                                }

                                Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                                B Offline
                                B Offline
                                Brisingr Aerowing
                                wrote on last edited by
                                #15

                                :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh:

                                T J 2 Replies Last reply
                                0
                                • B Brisingr Aerowing

                                  :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh:

                                  T Offline
                                  T Offline
                                  Thomas Daniels
                                  wrote on last edited by
                                  #16

                                  Arrrggghhhh! My eyes! :eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::eek::

                                  Z 1 Reply Last reply
                                  0
                                  • M Mohammed Hameed

                                    List<Employee> employees = new List<Employee>();

                                    if (employees != null){
                                    employees = GetEmployees();
                                    }

                                    Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

                                    V Offline
                                    V Offline
                                    vonb
                                    wrote on last edited by
                                    #17

                                    Well, the null has really nothing to do there. Check if(employees.Count()==0) I would do like this

                                    class TestClass()
                                    {
                                    List employees { get; set; }

                                     TestClass()
                                     {
                                          employees = GetEmployees();
                                     }
                                    
                                     private List GetEmployees()
                                     {
                                          return (from oRec in DataModel.Employees select oRec).ToList();
                                     }
                                    

                                    }

                                    The signature is in building process.. Please wait...

                                    M Richard DeemingR 2 Replies Last reply
                                    0
                                    • V vonb

                                      Well, the null has really nothing to do there. Check if(employees.Count()==0) I would do like this

                                      class TestClass()
                                      {
                                      List employees { get; set; }

                                       TestClass()
                                       {
                                            employees = GetEmployees();
                                       }
                                      
                                       private List GetEmployees()
                                       {
                                            return (from oRec in DataModel.Employees select oRec).ToList();
                                       }
                                      

                                      }

                                      The signature is in building process.. Please wait...

                                      M Offline
                                      M Offline
                                      Mohammed Hameed
                                      wrote on last edited by
                                      #18

                                      Thanks.

                                      Previous -> Read "CLR via C#" by Jeffrey Ritcher. Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder. Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.

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                                      • V vonb

                                        Well, the null has really nothing to do there. Check if(employees.Count()==0) I would do like this

                                        class TestClass()
                                        {
                                        List employees { get; set; }

                                         TestClass()
                                         {
                                              employees = GetEmployees();
                                         }
                                        
                                         private List GetEmployees()
                                         {
                                              return (from oRec in DataModel.Employees select oRec).ToList();
                                         }
                                        

                                        }

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                                        Richard DeemingR Offline
                                        Richard DeemingR Offline
                                        Richard Deeming
                                        wrote on last edited by
                                        #19

                                        vonb wrote:

                                        return (from oRec in DataModel.Employees select oRec).ToList();

                                        Why do so many people insist on adding a pointless "from x in source select x" query to their code, when it has the same result as the much more concise "source"?

                                        private List<Employee> GetEmployees()
                                        {
                                        return DataModel.Employees.ToList();
                                        }


                                        "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

                                        "These people looked deep within my soul and assigned me a number based on the order in which I joined" - Homer

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                                        • Richard DeemingR Richard Deeming

                                          vonb wrote:

                                          return (from oRec in DataModel.Employees select oRec).ToList();

                                          Why do so many people insist on adding a pointless "from x in source select x" query to their code, when it has the same result as the much more concise "source"?

                                          private List<Employee> GetEmployees()
                                          {
                                          return DataModel.Employees.ToList();
                                          }


                                          "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

                                          V Offline
                                          V Offline
                                          vonb
                                          wrote on last edited by
                                          #20

                                          This was just a simple implementation of more complex queries which I actually use

                                          publc List GetEmployees(int departmentId)
                                          {
                                          return (from oRec in DataModel.Employees where oRec.DepartmentID == departmentId).ToList();
                                          }

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                                          Richard DeemingR 1 Reply Last reply
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