long versus Long?

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  • Ikke
    #1

    long versus Long?

    Hi everybody,

    Coming from a Java background, I'm used to having a "long" type and a
    "Long" Object around...

    I've recently started a simple, small C# project, and I'm looking for a way
    to pass a long value to a method, which only accepts an Object. Logically,
    I can't pass the long value so I started looking for a Long Object. But I
    can't seem to find it!

    Is there such a thing as a Long Object in C#, and if not, how do I solve
    this problem?

    Thanks,

    Ikke
    Tags: c# long, long c#
    • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
      #2
      Re: long versus Long?

      Ikke wrote:
      Coming from a Java background, I'm used to having a "long" type and a
      "Long" Object around...
      >
      I've recently started a simple, small C# project, and I'm looking for a way
      to pass a long value to a method, which only accepts an Object. Logically,
      I can't pass the long value so I started looking for a Long Object. But I
      can't seem to find it!
      >
      Is there such a thing as a Long Object in C#, and if not, how do I solve
      this problem?
      1) you can pass a long to something that expects an object

      2) long has an alias System.Int64, which is probably the closest
      to java.lang.Long you can find, but note that long is an alias
      for System.Int64, System.Int64 is not a wrapper around long

      Arne

        Comment

        • Eugene Mayevski
          #3
          Re: long versus Long?

          Hello!
          You wrote on Sun, 22 Apr 2007 13:55:07 GMT:

          IIs there such a thing as a Long Object in C#, and if not, how do I solve
          Ithis problem?

          System.Int64?

          With best regards,
          Eugene Mayevski
          http://www.SecureBlackbox.com - the comprehensive component suite for
          network security

            Comment

            • Ikke
              #4
              Re: long versus Long?

              Arne Vajhøj <arne@vajhoej.d kwrote in
              news:462b6c51$0 $90269$14726298 @news.sunsite.d k:

              <snip>
              >Is there such a thing as a Long Object in C#, and if not, how do I
              >solve this problem?
              >
              1) you can pass a long to something that expects an object
              >
              2) long has an alias System.Int64, which is probably the closest
              to java.lang.Long you can find, but note that long is an alias
              for System.Int64, System.Int64 is not a wrapper around long
              >
              Arne
              I think the first option is the best for this particular case, but it's
              nice to know about option 2.

              Thanks, Arne & Eugene for both your quick replies!

              Ikke

                Comment

                • Jeff Jarrell
                  #5
                  Re: long versus Long?

                  read up on "boxing". Anytime, a value type is passed into something that is
                  expecting an object the CLR will implicitly convert it to an object.
                  http://en.csharp-online.net/Glossary:Definition_-_Boxing




                  "Ikke" <ikke@hier.bewr ote in message
                  news:Xns991AA23 CC8FCEikkehierb e@195.130.132.7 0...
                  Hi everybody,
                  >
                  Coming from a Java background, I'm used to having a "long" type and a
                  "Long" Object around...
                  >
                  I've recently started a simple, small C# project, and I'm looking for a
                  way
                  to pass a long value to a method, which only accepts an Object. Logically,
                  I can't pass the long value so I started looking for a Long Object. But I
                  can't seem to find it!
                  >
                  Is there such a thing as a Long Object in C#, and if not, how do I solve
                  this problem?
                  >
                  Thanks,
                  >
                  Ikke

                    Comment

                    • Nicholas Paldino [.NET/C# MVP]
                      #6
                      Re: long versus Long?

                      It should be noted that long in C# is NOT the same, or even close to the
                      Long object in java.

                      When something expects an object, you can pass a long to it, and the
                      value type is boxed, meaning that a reference type object is created and the
                      value type stored in it. The process of getting the value type back from
                      the object reference is called unboxing.

                      This is very, very different from the Long object in Java, which is
                      actually a typed wrapper which allows pass by reference semantics. If you
                      are looking for something similar in .NET, you are going to have to code it
                      yourself.

                      Hope this helps.

                      --
                      - Nicholas Paldino [.NET/C# MVP]
                      - mvp@spam.guard. caspershouse.co m

                      "Ikke" <ikke@hier.bewr ote in message
                      news:Xns991AA60 9C3E0Eikkehierb e@195.130.132.7 0...
                      Arne Vajhøj <arne@vajhoej.d kwrote in
                      news:462b6c51$0 $90269$14726298 @news.sunsite.d k:
                      >
                      <snip>
                      >>Is there such a thing as a Long Object in C#, and if not, how do I
                      >>solve this problem?
                      >>
                      >1) you can pass a long to something that expects an object
                      >>
                      >2) long has an alias System.Int64, which is probably the closest
                      > to java.lang.Long you can find, but note that long is an alias
                      > for System.Int64, System.Int64 is not a wrapper around long
                      >>
                      >Arne
                      >
                      I think the first option is the best for this particular case, but it's
                      nice to know about option 2.
                      >
                      Thanks, Arne & Eugene for both your quick replies!
                      >
                      Ikke

                        Comment

                        • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
                          #7
                          Re: long versus Long?

                          Nicholas Paldino [.NET/C# MVP] wrote:
                          It should be noted that long in C# is NOT the same, or even close to the
                          Long object in java.
                          >
                          When something expects an object, you can pass a long to it, and the
                          value type is boxed, meaning that a reference type object is created and the
                          value type stored in it. The process of getting the value type back from
                          the object reference is called unboxing.
                          >
                          This is very, very different from the Long object in Java, which is
                          actually a typed wrapper which allows pass by reference semantics. If you
                          are looking for something similar in .NET, you are going to have to code it
                          yourself.
                          Calling with a java.lang.Long will pass a reference by value which
                          refer to an immutable object.

                          Not much by reference semantics in that.

                          Arne

                            Comment

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