Re: System.Drawing.Image.FromFile leaves file open longer than necessary: bug?

From: Lucvdv (replace_name_at_null.net)
Date: 08/02/04

  • Next message: Jack Wright: "How to ensure that your .Net application is running in the right .net runtime version?" 
    Date: Mon, 02 Aug 2004 08:53:49 +0200

    On Fri, 30 Jul 2004 05:10:52 -0700, "David Williams , VB.NET MVP"
    <davidd.NOSPAM.williams@earthlink.net> wrote:

    > No, explicitly running Collect() is normally a bad idea - it will
    > adversely impact the performance of your code and can cause other
    > problems.

    That may depend on the situation. I found out in a DirectX application
    that has to run for long stretches of time (12 hours or more of
    uninterrupted D3D rendering in an applications that's controlled by events
    it receives at a constant rate of several events/second), it's better to
    force it at regular small intervals to prevent it from causing a noticeable
    load on the system when it finally does it by itself.

    > The best way that I have found to handle this problem is to load the
    > image from a stream object that you control instead of directly from a
    > file. This way you can use the image as long as you need, but close and
    > dispose the stream as soon as you are done reading it.

    I noticed it in a test program I wrote to find the best way to handle the
    TWAIN capture, but the real app saves and reads small jpegs into/from a
    database (ID photographs in a people database). I was already planning to
    load them into a byte array for doing the database side and make a memory
    stream out of the same array for copying into the picturebox, so that would
    automatically become the solution.

  • Next message: Jack Wright: "How to ensure that your .Net application is running in the right .net runtime version?"

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