Filestream System.OutofmemoryException
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Thread: Filestream System.OutofmemoryException

  1. #1
    Join Date
    Jan 2012
    Posts
    6

    Filestream System.OutofmemoryException

    Hi,
    I am getting an System.OutofmemoryException when using Filestream to load zip file. the file is 521MB. My code is:

    //Insert using Filestream, file into SQL Server Table
    private void btnInsert_Click(object sender, EventArgs e)
    {
    OpenFileDialog openFileDlg = new OpenFileDialog();
    openFileDlg.InitialDirectory = Directory.GetCurrentDirectory();
    if (openFileDlg.ShowDialog() == DialogResult.OK)
    {
    FileInfo fi = new FileInfo(openFileDlg.FileName);
    FileStream fs = new FileStream(fi.FullName, FileMode.Open, FileAccess.Read);
    BinaryReader rdr = new BinaryReader(fs);
    byte[] fileData = rdr.ReadBytes((int)fs.Length);
    rdr.Close();
    fs.Close();

    My program dies on this line: byte[] fileData = rdr.ReadBytes((int)fs.Length);
    i have also attached the detail for the System.OutofMemoryException. I am runing this on a Windows 7, 64bit machine.

    thanks for your help.

    Sharon
    Attached Files Attached Files

  2. #2
    Join Date
    Jun 2008
    Posts
    2,477

    Re: Filestream System.OutofmemoryException

    You're trying to read 521MB directly into memory... and apparently there is not enough. That seems pretty evident. When reading large files you should use the stream as a... well, as a stream, not a big huge block of data.
    If you liked my post go ahead and give me an upvote so that my epee.... ahem, reputation will grow.

    Yes; I have a blog too - http://the-angry-gorilla.com/

  3. #3
    Join Date
    Jan 2012
    Posts
    6

    Re: Filestream System.OutofmemoryException

    BigEd,
    I'm new to C#, any ideas how I can fix this?

    Sharon

  4. #4
    Join Date
    Jun 2008
    Posts
    2,477

    Re: Filestream System.OutofmemoryException

    Don't call ReadBytes. At least, don't pass in the entire size of the file. That reads the whole thing in. Instead, use something like ReadByte and iterate over the stream, letting the library take care of buffering chunks of it into memory for you.
    If you liked my post go ahead and give me an upvote so that my epee.... ahem, reputation will grow.

    Yes; I have a blog too - http://the-angry-gorilla.com/

  5. #5
    Join Date
    Jan 2012
    Posts
    6

    Re: Filestream System.OutofmemoryException

    Hi,

    As I mentioned I have a machine that has 8 GB of memory. I had to shut down my machine to take it home last night.

    When I tried to load the file again today it loaded with no problem. Normally I will only be loading one file at a

    time, but in this case I was testing my Development database and was loading 28 files one right after the other.

    Now my question is, since it is working ok now, is there a problem I still need to fix?

    Sharon

  6. #6
    Join Date
    Jun 2008
    Posts
    2,477

    Re: Filestream System.OutofmemoryException

    No, it does not mean it will always work, but on an x64 machine with 8GB of RAM (assuming that your C# app is targeting x64 or Any CPU) it would be fine most of the time. You should try to avoid it if possible, but if your test machine represents normal operating conditions you should be ok.
    If you liked my post go ahead and give me an upvote so that my epee.... ahem, reputation will grow.

    Yes; I have a blog too - http://the-angry-gorilla.com/

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