Question

当我将数据表写入csv文件时，我的内存不足。我用以下内容编写文件：

if (!filtered)
    {
        string TextExport = DataTableToCSV(datatable, TextSeparator);
        File.WriteAllText(FileName, TextExport);     // Write to the file name selected.                           
    }

private string DataTableToCSV(DataTable datatable, string seperator, bool SuppressDialog = false) 
        {
            try
            {
                StringBuilder sb = new StringBuilder();
                sb.Clear();
                sb.Append(@"""");  //start row with " 
                    for (int i = 0; i < datatable.Columns.Count; ++i)
                {
                    sb.Append(datatable.Columns[i].ToString());
                    if (i < datatable.Columns.Count - 1)
                        sb.Append(seperator);
                }
                sb.Append(@"""");   // end row with "
                sb.AppendLine();  //place the header

                foreach (DataRow dr in datatable.Rows)
                {
                    sb.Append(@""""); //  start row with "
                    for (int i = 0; i < datatable.Columns.Count; ++i)
                    {
                        sb.Append(dr[i].ToString());
                        if (i < datatable.Columns.Count - 1)
                            sb.Append(seperator);
                    }
                    sb.Append(@""""); // end row with "
                    sb.AppendLine();  //same as : sb.Append(Environment.NewLine);
                }
                if (SuppressDialog == false)
                {
                    MessageBox.Show("Opslaan bestand is gereed.",
                            "Informatie",
                            MessageBoxButtons.OK,
                            MessageBoxIcon.Information);
                }
                return sb.ToString();
            }
            catch (Exception ex)
            {
                Logging.WriteToLog("FOUT", "Exporteren naar CSV bestand is mislukt.");
                Logging.WriteToLog("FOUT", "Melding : ");
                Logging.WriteToLog("FOUT", ex.ToString());
                return "";
            }
        }

我读到的是内存不足，因为我立刻写了文件。我怎么能逐行写出来？

Answer 1

虽然其他人赞成使用库，但我通常使用List of string并遍历它来写出大块文本。警告 - 我只用大约35 MB的文本完成了这项工作，但仍然花了很长时间才写出来。

导出到CSV内存不足

1 个答案: