C# 不依赖框架直接导出为 .CSV

代码所示，将 Table 导出为 .csv 格式的数据。

        public static async Task SaveCSV(DataTable dt,string[] header, string fileName)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append($"{string.Join(",", header)}\r\n");

            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j <= dt.Columns.Count - 1; j++)
                {
                    sb.Append("\"" + dt.Rows[i][j] + "\"" + ",");

                }
                sb.Remove(sb.Length - 1, 1).Append("\r\n"); 
            }
            var bytes = Encoding.UTF8.GetBytes(sb.ToString());
            using FileStream fileStream = new FileStream(fileName, FileMode.CreateNew);
            await fileStream.WriteAsync(bytes);
        }

调用：

                    DataTable dataTable = new DataTable("结果");
                    var header = new List<string>() { "id","name",... };
                    foreach (var item in header)
                    {
                        dataTable.Columns.Add(item,typeof(string));
                    }

                    foreach (var item in exportObj.Values)
                    {
                        DataRow dr = dataTable.NewRow();
                        foreach (var r in item)
                        {
                            dr[r.Key] = r.Value;
                        }
                        dataTable.Rows.Add(dr);
                    }
                    SaveCSV(dataTable, header.ToArray(), filePath).Wait();