How to copy a DataTable?

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  • Férnas
    #1

    How to copy a DataTable?

    Hey guys,

    In my app, I have a DataTable named "dta"...

    If i create a new variable of DataTable type named "dta2", and assign
    the dta as value, it creates a reference to dta, then, when I make
    changes in dta, dta2 is also changed...

    For example:

    DataTable dta2;
    dta2 = dta;

    (now, if I change dta, dt2 will be changed to)..

    I'd like to know how to create a "copy" of "dta" (copy the structure
    and data), so, when I need to change dta, dta2 will keep the original
    data...

    I want another instance of the dataTable, with the same structure and
    data of the "copied"...

    can anybody help-me?

    Tags: None
    • Lebesgue
      #2
      Re: How to copy a DataTable?

      When doint DataTable dta2 = dta; you are acutally copying the refernce to
      the original instance.

      To copy the actual object, use the clone method.

      DataTable copied = dta.Clone();

      now copied references a new object which is equal to the original dta but is
      not the same.

      "Férnas" <garbage@widewe b.com.brwrote in message
      news:1158933879 .824348.278680@ h48g2000cwc.goo glegroups.com.. .
      Hey guys,
      >
      In my app, I have a DataTable named "dta"...
      >
      If i create a new variable of DataTable type named "dta2", and assign
      the dta as value, it creates a reference to dta, then, when I make
      changes in dta, dta2 is also changed...
      >
      For example:
      >
      DataTable dta2;
      dta2 = dta;
      >
      (now, if I change dta, dt2 will be changed to)..
      >
      I'd like to know how to create a "copy" of "dta" (copy the structure
      and data), so, when I need to change dta, dta2 will keep the original
      data...
      >
      I want another instance of the dataTable, with the same structure and
      data of the "copied"...
      >
      can anybody help-me?
      >

        Comment

        • Ciaran O''Donnell
          #3
          RE: How to copy a DataTable?

          ..Clone() copies the structure alone. .Copy() copies the structure and data.

          Ciaran O'Donnell


          "Férnas" wrote:
          Hey guys,
          >
          In my app, I have a DataTable named "dta"...
          >
          If i create a new variable of DataTable type named "dta2", and assign
          the dta as value, it creates a reference to dta, then, when I make
          changes in dta, dta2 is also changed...
          >
          For example:
          >
          DataTable dta2;
          dta2 = dta;
          >
          (now, if I change dta, dt2 will be changed to)..
          >
          I'd like to know how to create a "copy" of "dta" (copy the structure
          and data), so, when I need to change dta, dta2 will keep the original
          data...
          >
          I want another instance of the dataTable, with the same structure and
          data of the "copied"...
          >
          can anybody help-me?
          >
          >

            Comment

            • Férnas
              #4
              Re: How to copy a DataTable?

              Hey Lebesgue, thanks for your reply...

              Is there a method to copy the data of the datatable too... I need the
              data, not just de structure and the clone method gives me just the
              structure...

              thanks!

              "I NEED THE STRUCTURE AND DATA PEOPLE"...

              thanks...

              Lebesgue escreveu:
              When doint DataTable dta2 = dta; you are acutally copying the refernce to
              the original instance.
              >
              To copy the actual object, use the clone method.
              >
              DataTable copied = dta.Clone();
              >
              now copied references a new object which is equal to the original dta butis
              not the same.
              >
              "Férnas" <garbage@widewe b.com.brwrote in message
              news:1158933879 .824348.278680@ h48g2000cwc.goo glegroups.com.. .
              Hey guys,

              In my app, I have a DataTable named "dta"...

              If i create a new variable of DataTable type named "dta2", and assign
              the dta as value, it creates a reference to dta, then, when I make
              changes in dta, dta2 is also changed...

              For example:

              DataTable dta2;
              dta2 = dta;

              (now, if I change dta, dt2 will be changed to)..

              I'd like to know how to create a "copy" of "dta" (copy the structure
              and data), so, when I need to change dta, dta2 will keep the original
              data...

              I want another instance of the dataTable, with the same structure and
              data of the "copied"...

              can anybody help-me?

                Comment

                • Lebesgue
                  #5
                  Re: How to copy a DataTable?

                  Use the Copy method then.

                  "Férnas" <garbage@widewe b.com.brwrote in message
                  news:1158937651 .525333.52790@i 3g2000cwc.googl egroups.com...
                  Hey Lebesgue, thanks for your reply...

                  Is there a method to copy the data of the datatable too... I need the
                  data, not just de structure and the clone method gives me just the
                  structure...

                  thanks!

                  "I NEED THE STRUCTURE AND DATA PEOPLE"...

                  thanks...

                  Lebesgue escreveu:
                  When doint DataTable dta2 = dta; you are acutally copying the refernce to
                  the original instance.
                  >
                  To copy the actual object, use the clone method.
                  >
                  DataTable copied = dta.Clone();
                  >
                  now copied references a new object which is equal to the original dta but
                  is
                  not the same.
                  >
                  "Férnas" <garbage@widewe b.com.brwrote in message
                  news:1158933879 .824348.278680@ h48g2000cwc.goo glegroups.com.. .
                  Hey guys,

                  In my app, I have a DataTable named "dta"...

                  If i create a new variable of DataTable type named "dta2", and assign
                  the dta as value, it creates a reference to dta, then, when I make
                  changes in dta, dta2 is also changed...

                  For example:

                  DataTable dta2;
                  dta2 = dta;

                  (now, if I change dta, dt2 will be changed to)..

                  I'd like to know how to create a "copy" of "dta" (copy the structure
                  and data), so, when I need to change dta, dta2 will keep the original
                  data...

                  I want another instance of the dataTable, with the same structure and
                  data of the "copied"...

                  can anybody help-me?

                    Comment

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