현재 어떤 기능을 쓰레드로 가동하고 있습니다.

해당 기능의 코드입니다.

IEnumerable<string> caselines = File.ReadAllLines(openFileDialog1.FileName).Reverse();

                                    foreach (string caseline in caselines)
                                    {
                                        var co = caseline.Split(',');

                                        double co0 = Convert.ToDouble(co[0]);
                                        double co1 = Convert.ToDouble(co[1]);
                                        double co2 = Convert.ToDouble(co[2]);
                                        double co3 = Convert.ToDouble(co[3]);
                                        double co4 = Convert.ToDouble(co[4]);
                                        double co5 = Convert.ToDouble(co[5]);
                                        string co6 = co[6];

                                        if (co6 == minDateTime || (Convert.ToDateTime(co[6]) >= Convert.ToDateTime(minDateTime) && Convert.ToDateTime(co[6]) <= Convert.ToDateTime(maxDateTime)))
                                        {
                                            lists.Add(co0.ToString());
                                            lists.Add(co1.ToString());
                                            lists.Add(co2.ToString());
                                            lists.Add(co3.ToString());
                                            lists.Add(co4.ToString());
                                            lists.Add(co5.ToString());
                                            lists.Add(co[6]);
                                        }
                                        else if (Convert.ToDateTime(co6) > Convert.ToDateTime(maxDateTime))
                                        {
                                            break;
                                        }
                                    }

                                    searchProgressBar.Maximum = lists.Count() / 7;
                                    searchDataNumber.Text = (lists.Count() / 7).ToString();

                                    int a = 0;

                                    foreach (string caseline2 in caselines)
                                    {
                                        var cols = caseline2.Split(',');

                                        double cols0 = Convert.ToDouble(cols[0]);
                                        double cols1 = Convert.ToDouble(cols[1]);
                                        double cols2 = Convert.ToDouble(cols[2]);
                                        double cols3 = Convert.ToDouble(cols[3]);
                                        double cols4 = Convert.ToDouble(cols[4]);
                                        double cols5 = Convert.ToDouble(cols[5]);
                                        string cols6 = cols[6];

                                        if (cols6 == minDateTime || (Convert.ToDateTime(cols[6]) >= Convert.ToDateTime(minDateTime) && Convert.ToDateTime(cols[6]) <= Convert.ToDateTime(maxDateTime)))
                                        {
                                            dataGridView2.Rows.Add();

                                            dataGridView2.Rows[a].Cells[0].Value = cols0;
                                            dataGridView2.Rows[a].Cells[1].Value = cols1;
                                            dataGridView2.Rows[a].Cells[2].Value = cols2;
                                            dataGridView2.Rows[a].Cells[3].Value = cols3;
                                            dataGridView2.Rows[a].Cells[4].Value = cols4;
                                            dataGridView2.Rows[a].Cells[5].Value = cols5;
                                            dataGridView2.Rows[a].Cells[6].Value = cols[6];

                                            searchProgressBar.PerformStep();
                                            Application.DoEvents();

                                            a++;
                                        }

진행하다 보면 속도가 갑자기 느려지는 데 이 때 dataGridView2 를 한 번 키고 꺼주면 속도가 다시 올라간 후 그 속도로 유지됩니다.
원인이 무엇인가요 ??
속도가 느려지는 원인은 UI 에 표시하기 때문일 것으로 추측되지만 표를 끄고 있기 때문에 이 추측은 신빙성이 낮아 보여서 도무지 알 길이 없네요..

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• [다음 글] [답변]: UI 변경 작업 여러개를 동시에 사용하려면 어떻게 해야되나요 ??
• [이전 글] HTTP JSON POST 관련 질문 드립니다.

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