Question

I really REALLY hope that someone could help me.

I have to pass almost 400.000 records from a database to a textfile
Because of this amount the extension of the textfile is just something
I made up …(.you_name_it)
I get an error while writing the data to the file at +/- 9000 records.
The error = Exception of type ‘System.OutOfMemoryException’ was thrown
And I don’t know the solution 🙁

This is the peace of code I use for writing the records to the file.

        this.path_to_file =
        ConfigurationManager.AppSettings["ExportDir"] +
DateTime.Now.ToString(ConfigurationManager.AppSettings
["Export_FileName"]) + ConfigurationManager.AppSettings
["Export_Extension"];


        FileStream fm = new FileStream
           (this.path_to_file, FileMode.Create, FileAccess.ReadWrite,
FileShare.ReadWrite);

        StreamWriter sw = new StreamWriter(fm, Encoding.Default);

        List<Export> exportRecords = null;

        exportRecords = ExportList();
        try
        {
            int i = 0;
           foreach (Export ex in exportRecords)
           {
               sw.Write(ex.ExportLine());
              sw.Write(sw.NewLine);
              sw.Flush();
              exportlines += ex.ExportLine() + "\n";
               i++;
           }
        }
        catch (Exception exc)
        {
           Log.Write(exc.Message);
        }

Answer 1

Why is this line in your code?

      exportlines += ex.ExportLine() + "\n"

Assuming it is a string variable it grows and grows and grows… and consumes memory.