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  • Jakub Cermak
    #1

    Threads

    Hi all,
    sorry for my beginner question.
    How can I change a form property from a thread (I don't think primary
    application thread, but the instance of Thread class)? If I do it i get
    an exception InvalidOperatio nException - Cross-thread
    operation not valid: Control 'lblStatusGame' accessed from a thread
    other than the thread it was created on.
    --
    Best regards,

    Jakub Cermak
    ICQ 159971304
    Neexistující doména - Webzdarma.cz | Webzdarma.cz
    http://cermi.wz.cz
    Neexistující doména

    Tags: None
    • Jon Skeet [C# MVP]
      #2
      Re: Threads

      Jakub Cermak <ja.cermi@centr um.cz> wrote:[color=blue]
      > sorry for my beginner question.
      > How can I change a form property from a thread (I don't think primary
      > application thread, but the instance of Thread class)? If I do it i get
      > an exception InvalidOperatio nException - Cross-thread
      > operation not valid: Control 'lblStatusGame' accessed from a thread
      > other than the thread it was created on.[/color]

      You can't - you need to use Control.Invoke or Control.BeginIn voke.

      See http://www.pobox.com/~skeet/csharp/t...winforms.shtml

      --
      Jon Skeet - <skeet@pobox.co m>
      Pobox is now part of Fastmail
      http://www.pobox.com/~skeet
      Pobox has been discontinued as a separate service, and all existing customers moved to the Fastmail platform.

      If replying to the group, please do not mail me too

        Comment

        • Jon Skeet [C# MVP]
          #3
          Re: Threads

          Jakub Cermak <ja.cermi@centr um.cz> wrote:[color=blue]
          > sorry for my beginner question.
          > How can I change a form property from a thread (I don't think primary
          > application thread, but the instance of Thread class)? If I do it i get
          > an exception InvalidOperatio nException - Cross-thread
          > operation not valid: Control 'lblStatusGame' accessed from a thread
          > other than the thread it was created on.[/color]

          You can't - you need to use Control.Invoke or Control.BeginIn voke.

          See http://www.pobox.com/~skeet/csharp/t...winforms.shtml

          --
          Jon Skeet - <skeet@pobox.co m>
          Pobox is now part of Fastmail
          http://www.pobox.com/~skeet
          Pobox has been discontinued as a separate service, and all existing customers moved to the Fastmail platform.

          If replying to the group, please do not mail me too

            Comment

            • Dmytro Lapshyn [MVP]
              #4
              Re: Threads

              Hi Jakub,

              All operations on forms and controls must be done on the main (UI) thread.
              If you need to do them from other threads, use the Control.InvokeR equired
              and Control.Invoke (see MSDN docs on these for detailed information).

              --
              Sincerely,
              Dmytro Lapshyn [Visual Developer - Visual C# MVP]


              "Jakub Cermak" <ja.cermi@centr um.cz> wrote in message
              news:u3cILbJXFH A.3280@TK2MSFTN GP09.phx.gbl...[color=blue]
              > Hi all,
              > sorry for my beginner question.
              > How can I change a form property from a thread (I don't think primary
              > application thread, but the instance of Thread class)? If I do it i get an
              > exception InvalidOperatio nException - Cross-thread
              > operation not valid: Control 'lblStatusGame' accessed from a thread
              > other than the thread it was created on.
              > --
              > Best regards,
              >
              > Jakub Cermak
              > ICQ 159971304
              > http://cermi.wz.cz[/color]

                Comment

                • Dmytro Lapshyn [MVP]
                  #5
                  Re: Threads

                  Hi Jakub,

                  All operations on forms and controls must be done on the main (UI) thread.
                  If you need to do them from other threads, use the Control.InvokeR equired
                  and Control.Invoke (see MSDN docs on these for detailed information).

                  --
                  Sincerely,
                  Dmytro Lapshyn [Visual Developer - Visual C# MVP]


                  "Jakub Cermak" <ja.cermi@centr um.cz> wrote in message
                  news:u3cILbJXFH A.3280@TK2MSFTN GP09.phx.gbl...[color=blue]
                  > Hi all,
                  > sorry for my beginner question.
                  > How can I change a form property from a thread (I don't think primary
                  > application thread, but the instance of Thread class)? If I do it i get an
                  > exception InvalidOperatio nException - Cross-thread
                  > operation not valid: Control 'lblStatusGame' accessed from a thread
                  > other than the thread it was created on.
                  > --
                  > Best regards,
                  >
                  > Jakub Cermak
                  > ICQ 159971304
                  > http://cermi.wz.cz[/color]

                    Comment

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