Generic collection question

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  • SStory
    #1

    Generic collection question

    I am doing a Generic.Diction ary(of string,myobject )

    I need to access the item by key, but also by index. Is this the wrong thing
    to use? Should I be using something different.

    In other words sometimes I just need item(0), the first item added to the
    list, but other times by key.

    TIA,

    Shane


    Tags: None
    • Theo Verweij
      #2
      Re: Generic collection question

      To access the keys by index, use the following code:

      Dim KeyArray(YourDi ctionary.Keys.C ount) as string
      YourDictionary. Keys.CopyTo(Key Array)

      ValueByIndex = YourDictionary( KeyArray(Index) )

      I am doing a Generic.Diction ary(of string,myobject )
      >
      I need to access the item by key, but also by index. Is this the wrong thing
      to use? Should I be using something different.
      >
      In other words sometimes I just need item(0), the first item added to the
      list, but other times by key.
      >
      TIA,
      >
      Shane
      >
      >

        Comment

        • SStory
          #3
          Re: Generic collection question

          Well,

          I was reading the documentation which says there is no way to guarantee the
          order.
          I need item 0.

          I am now trying to build my own generic class to do this.

          Thanks,

          Shane

          "Theo Verweij" <tverweij@xs4al l.nlwrote in message
          news:%231krgzHy GHA.3440@TK2MSF TNGP06.phx.gbl. ..
          To access the keys by index, use the following code:
          >
          Dim KeyArray(YourDi ctionary.Keys.C ount) as string
          YourDictionary. Keys.CopyTo(Key Array)
          >
          ValueByIndex = YourDictionary( KeyArray(Index) )
          >
          >
          >I am doing a Generic.Diction ary(of string,myobject )
          >>
          >I need to access the item by key, but also by index. Is this the wrong
          >thing to use? Should I be using something different.
          >>
          >In other words sometimes I just need item(0), the first item added to the
          >list, but other times by key.
          >>
          >TIA,
          >>
          >Shane

            Comment

            • Kerry Moorman
              #4
              Re: Generic collection question

              Shane,

              You might be able to build off of NameObjectColle ctionBase.

              Kerry Moorman


              "SStory" wrote:
              Well,
              >
              I was reading the documentation which says there is no way to guarantee the
              order.
              I need item 0.
              >
              I am now trying to build my own generic class to do this.
              >
              Thanks,
              >
              Shane
              >
              "Theo Verweij" <tverweij@xs4al l.nlwrote in message
              news:%231krgzHy GHA.3440@TK2MSF TNGP06.phx.gbl. ..
              To access the keys by index, use the following code:

              Dim KeyArray(YourDi ctionary.Keys.C ount) as string
              YourDictionary. Keys.CopyTo(Key Array)

              ValueByIndex = YourDictionary( KeyArray(Index) )

              I am doing a Generic.Diction ary(of string,myobject )
              >
              I need to access the item by key, but also by index. Is this the wrong
              thing to use? Should I be using something different.
              >
              In other words sometimes I just need item(0), the first item added to the
              list, but other times by key.
              >
              TIA,
              >
              Shane
              >
              >
              >

                Comment

                • Theo Verweij
                  #5
                  Re: Generic collection question

                  I just runned some tests, and it seems that the order stays in the order
                  you added the items, as long as you don't use the remove method.



                  SStory wrote:
                  Well,
                  >
                  I was reading the documentation which says there is no way to guarantee the
                  order.
                  I need item 0.
                  >
                  I am now trying to build my own generic class to do this.
                  >
                  Thanks,
                  >
                  Shane
                  >
                  "Theo Verweij" <tverweij@xs4al l.nlwrote in message
                  news:%231krgzHy GHA.3440@TK2MSF TNGP06.phx.gbl. ..
                  >To access the keys by index, use the following code:
                  >>
                  >Dim KeyArray(YourDi ctionary.Keys.C ount) as string
                  >YourDictionary .Keys.CopyTo(Ke yArray)
                  >>
                  >ValueByIndex = YourDictionary( KeyArray(Index) )
                  >>
                  >>
                  >>I am doing a Generic.Diction ary(of string,myobject )
                  >>>
                  >>I need to access the item by key, but also by index. Is this the wrong
                  >>thing to use? Should I be using something different.
                  >>>
                  >>In other words sometimes I just need item(0), the first item added to the
                  >>list, but other times by key.
                  >>>
                  >>TIA,
                  >>>
                  >>Shane
                  >
                  >

                    Comment

                    • SStory
                      #6
                      Re: Generic collection question

                      That's what I did and finally got it going.

                      For any who read this.. BE WARE that For Each doesn't work well with it
                      unless you override the GetEnumerator and return the values.GetEnume rator

                      This will make it work as you would expect. Otherwise you get an
                      enumeration of the keys.

                      Thanks to all!

                      Shane

                      "Kerry Moorman" <KerryMoorman@d iscussions.micr osoft.comwrote in message
                      news:A4E28518-C279-41FD-8C03-B48217FFA742@mi crosoft.com...
                      Shane,
                      >
                      You might be able to build off of NameObjectColle ctionBase.
                      >
                      Kerry Moorman
                      >
                      >
                      "SStory" wrote:
                      >
                      >Well,
                      >>
                      >I was reading the documentation which says there is no way to guarantee
                      >the
                      >order.
                      >I need item 0.
                      >>
                      >I am now trying to build my own generic class to do this.
                      >>
                      >Thanks,
                      >>
                      >Shane
                      >>
                      >"Theo Verweij" <tverweij@xs4al l.nlwrote in message
                      >news:%231krgzH yGHA.3440@TK2MS FTNGP06.phx.gbl ...
                      To access the keys by index, use the following code:
                      >
                      Dim KeyArray(YourDi ctionary.Keys.C ount) as string
                      YourDictionary. Keys.CopyTo(Key Array)
                      >
                      ValueByIndex = YourDictionary( KeyArray(Index) )
                      >
                      >
                      >I am doing a Generic.Diction ary(of string,myobject )
                      >>
                      >I need to access the item by key, but also by index. Is this the wrong
                      >thing to use? Should I be using something different.
                      >>
                      >In other words sometimes I just need item(0), the first item added to
                      >the
                      >list, but other times by key.
                      >>
                      >TIA,
                      >>
                      >Shane
                      >>
                      >>
                      >>

                        Comment

                        • Jay B. Harlow [MVP - Outlook]
                          #7
                          Re: Generic collection question

                          SStory,
                          If I need a generic collection with access by key & index I will normally
                          use a System.Collecti ons.ObjectModel .KeyedCollectio n(Of TKey, TItem).
                          Especially when used as a base class.

                          --
                          Hope this helps
                          Jay B. Harlow [MVP - Outlook]
                          ..NET Application Architect, Enthusiast, & Evangelist
                          T.S. Bradley - http://www.tsbradley.net


                          "SStory" <nospam@nospam. comwrote in message
                          news:e5wW7jHyGH A.1936@TK2MSFTN GP06.phx.gbl...
                          |I am doing a Generic.Diction ary(of string,myobject )
                          |
                          | I need to access the item by key, but also by index. Is this the wrong
                          thing
                          | to use? Should I be using something different.
                          |
                          | In other words sometimes I just need item(0), the first item added to the
                          | list, but other times by key.
                          |
                          | TIA,
                          |
                          | Shane
                          |
                          |


                            Comment

                            • SStory
                              #8
                              Re: Generic collection question

                              Thanks Jay

                              "Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP @tsbradley.netw rote in
                              message news:ueEjYsKyGH A.4232@TK2MSFTN GP05.phx.gbl...
                              SStory,
                              If I need a generic collection with access by key & index I will normally
                              use a System.Collecti ons.ObjectModel .KeyedCollectio n(Of TKey, TItem).
                              Especially when used as a base class.
                              >
                              --
                              Hope this helps
                              Jay B. Harlow [MVP - Outlook]
                              .NET Application Architect, Enthusiast, & Evangelist
                              T.S. Bradley - http://www.tsbradley.net
                              >
                              >
                              "SStory" <nospam@nospam. comwrote in message
                              news:e5wW7jHyGH A.1936@TK2MSFTN GP06.phx.gbl...
                              |I am doing a Generic.Diction ary(of string,myobject )
                              |
                              | I need to access the item by key, but also by index. Is this the wrong
                              thing
                              | to use? Should I be using something different.
                              |
                              | In other words sometimes I just need item(0), the first item added to
                              the
                              | list, but other times by key.
                              |
                              | TIA,
                              |
                              | Shane
                              |
                              |
                              >
                              >

                                Comment

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