将DataTable转换成CSV文件

       /// <summary>
        /// 将DataTable转换成CSV文件
        /// </summary>
        /// <param name="dt">DataTable</param>
        /// <param name="filePath">文件路径</param>
        public static void SaveCsv(DataTable dt, string filePath)
        {
            FileStream fs = null;
            StreamWriter sw = null;
            try
            {
                fs = new FileStream(filePath + dt.TableName + ".csv", FileMode.Create, FileAccess.Write);
                sw = new StreamWriter(fs, Encoding.Default);
                var data = string.Empty;
                //写出列名称
                for (var i = 0; i < dt.Columns.Count; i++)
                {
                    data += dt.Columns[i].ColumnName;
                    if (i < dt.Columns.Count - 1)
                    {
                        data += ",";
                    }
                }
                sw.WriteLine(data);
                //写出各行数据
                for (var i = 0; i < dt.Rows.Count; i++)
                {
                    data =string.Empty;
                    for (var j = 0; j < dt.Columns.Count; j++)
                    {
                        data += dt.Rows[i][j].ToString();
                        if (j < dt.Columns.Count - 1)
                        {
                            data += ",";
                        }
                    }
                    sw.WriteLine(data);
                }
            }
            catch (IOException ex)
            {
                throw new IOException(ex.Message, ex);
            }
            finally
            {
                if (sw != null) sw.Close();
                if (fs != null) fs.Close();
            }
        }