出力csv

        public static void ExportResultLog(System.Data.DataTable dt, string fileName, string path)
        {
            if (!System.IO.Directory.Exists(path))
            {
                System.IO.Directory.CreateDirectory(path);
            }

            string strPath = path + fileName;

            StringBuilder strColu = new StringBuilder();
            StringBuilder strLineValue = new StringBuilder();
            try
            {
                if (System.IO.File.Exists(strPath))
                {
                    string[] stringlines = System.IO.File.ReadAllLines(strPath, Encoding.Default);
                    string line = string.Empty;
                    foreach (string readLine in stringlines)
                    {
                        line += readLine + "\r\n";
                    }
                    line = line.Remove(line.Length - 2, 2);

                    System.IO.StreamWriter sw = new System.IO.StreamWriter(strPath, false, Encoding.GetEncoding("UTF-8"));

                    sw.WriteLine(line);

                    foreach (DataRow dr in dt.Rows)
                    {
                        strLineValue.Remove(0, strLineValue.Length);
                        for (int i = 0; i <= dt.Columns.Count - 1; i++)
                        {
                            strLineValue.Append(ReplaceChar(dr[i] == DBNull.Value ? "" : dr[i].ToString()));
                            strLineValue.Append(",");
                        }
                        strLineValue.Remove(strLineValue.Length - 1, 1);
                        sw.WriteLine(strLineValue.ToString());
                    }
                    sw.Close();
                }
                else
                {
                    System.IO.StreamWriter sw = new System.IO.StreamWriter(strPath, false, Encoding.GetEncoding("UTF-8"));

                    for (int i = 0; i <= dt.Columns.Count - 1; i++)
                    {
                        strColu.Append(dt.Columns[i].ColumnName);
                        strColu.Append(",");
                    }
                    strColu.Remove(strColu.Length - 1, 1);
                    sw.WriteLine(strColu);

                    foreach (DataRow dr in dt.Rows)
                    {
                        strLineValue.Remove(0, strLineValue.Length);
                        for (int i = 0; i <= dt.Columns.Count - 1; i++)
                        {
                            strLineValue.Append(ReplaceChar(dr[i] == DBNull.Value ? "" : dr[i].ToString()));
                            strLineValue.Append(",");
                        }
                        strLineValue.Remove(strLineValue.Length - 1, 1);
                        sw.WriteLine(strLineValue.ToString());
                    }
                    sw.Close();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }

        public static void ExportLog(System.Data.DataTable dtLogInfo, string fileName, string path)
        {
            string strPath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, path);

            if (!System.IO.Directory.Exists(strPath))
            {
                System.IO.Directory.CreateDirectory(strPath);
            }

            strPath = path + fileName;

            StringBuilder strColu = new StringBuilder();
            StringBuilder strValue = new StringBuilder();
            try
            {
                if (System.IO.File.Exists(strPath))
                {
                    string[] stringlines = System.IO.File.ReadAllLines(strPath, Encoding.Default);
                    string line = string.Empty;
                    foreach (string readLine in stringlines)
                    {
                        line += readLine + "\r\n";
                    }

                    System.IO.StreamWriter sw = new System.IO.StreamWriter(strPath, false, Encoding.GetEncoding("UTF-8"));
                    strValue.Remove(0, strValue.Length);
                    for (int i = 0; i <= dtLogInfo.Columns.Count - 1; i++)
                    {
                        strValue.Append(ReplaceChar(dtLogInfo.Rows[0][i] == DBNull.Value ? "" : dtLogInfo.Rows[0][i].ToString()));
                        strValue.Append(",");
                    }
                    strValue.Remove(strValue.Length - 1, 1);
                    string value = line + strValue.ToString();
                    sw.WriteLine(value);
                    sw.Close();
                }
                else
                {
                    System.IO.StreamWriter sw = new System.IO.StreamWriter(strPath, false, Encoding.GetEncoding("UTF-8"));

                    for (int i = 0; i <= dtLogInfo.Columns.Count - 1; i++)
                    {
                        strColu.Append(dtLogInfo.Columns[i].ColumnName);
                        strColu.Append(",");
                    }
                    strColu.Remove(strColu.Length - 1, 1);
                    sw.WriteLine(strColu);

                    strValue.Remove(0, strValue.Length);
                    for (int i = 0; i <= dtLogInfo.Columns.Count - 1; i++)
                    {
                        strValue.Append(ReplaceChar(dtLogInfo.Rows[0][i] == DBNull.Value ? "" : dtLogInfo.Rows[0][i].ToString()));
                        strValue.Append(",");
                    }
                    strValue.Remove(strValue.Length - 1, 1);
                    sw.WriteLine(strValue.ToString());

                    sw.Close();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }