C#如何读取csv格式文件

//读CSV文件类,读取指定的CSV文件，可以导出DataTable
    public class CsvStreamReader
    ...{
        private ArrayList rowAL;         //行链表,CSV文件的每一行就是一个链
        private string fileName;        //文件名

        private Encoding encoding;        //编码

        public CsvStreamReader()
        ...{
            this.rowAL = new ArrayList();
            this.fileName = "";
            this.encoding = Encoding.Default;
        }

        /**//// <summary>
        ///
        /// </summary>
        /// <param name="fileName">文件名,包括文件路径</param>
        public CsvStreamReader(string fileName)
        ...{
            this.rowAL = new ArrayList();
            this.fileName = fileName;
            this.encoding = Encoding.Default;
            LoadCsvFile();
        }

        /**//// <summary>
        ///
        /// </summary>
        /// <param name="fileName">文件名,包括文件路径</param>
        /// <param name="encoding">文件编码</param>
        public CsvStreamReader(string fileName, Encoding encoding)
        ...{
            this.rowAL = new ArrayList();
            this.fileName = fileName;
            this.encoding = encoding;
            LoadCsvFile();
        }

        /**//// <summary>
        /// 文件名,包括文件路径
        /// </summary>
        public string FileName
        ...{
            set
            ...{
                this.fileName = value;
                LoadCsvFile();
            }
        }

        /**//// <summary>
        /// 文件编码
        /// </summary>

        public Encoding FileEncoding
        ...{
            set
            ...{
                this.encoding = value;
            }
        }

        /**//// <summary>
        /// 获取行数
        /// </summary>
        public int RowCount
        ...{
            get
            ...{
                return this.rowAL.Count;
            }
        }

        /**//// <summary>
        /// 获取列数
        /// </summary>
        public int ColCount
        ...{
            get
            ...{
                int maxCol;

                maxCol = 0;
                for (int i = 0; i < this.rowAL.Count; i++)
                ...{
                    ArrayList colAL = (ArrayList)this.rowAL[i];

                    maxCol = (maxCol > colAL.Count) ? maxCol : colAL.Count;
                }

                return maxCol;
            }
        }


        /**//// <summary>
        /// 获取某行某列的数据

        /// row:行,row = 1代表第一行

        /// col:列,col = 1代表第一列  
        /// </summary>
        public string this[int row, int col]
        ...{
            get
            ...{
                //数据有效性验证

                CheckRowValid(row);
                CheckColValid(col);
                ArrayList colAL = (ArrayList)this.rowAL[row - 1];

                //如果请求列数据大于当前行的列时,返回空值

                if (colAL.Count < col)
                ...{
                    return "";
                }

                return colAL[col - 1].ToString();
            }
        }


        /**//// <summary>
        /// 根据最小行，最大行，最小列，最大列，来生成一个DataTable类型的数据

        /// 行等于1代表第一行

        /// 列等于1代表第一列

        /// maxrow: -1代表最大行
        /// maxcol: -1代表最大列
        /// </summary>
        public DataTable this[int minRow, int maxRow, int minCol, int maxCol]
        ...{
            get
            ...{
                //数据有效性验证

                CheckRowValid(minRow);
                CheckMaxRowValid(maxRow);
                CheckColValid(minCol);
                CheckMaxColValid(maxCol);
                if (maxRow == -1)
                ...{
                    maxRow = RowCount;
                }
                if (maxCol == -1)
                ...{
                    maxCol = ColCount;
                }
                if (maxRow < minRow)
                ...{
                    throw new Exception("最大行数不能小于最小行数");
                }
                if (maxCol < minCol)
                ...{
                    throw new Exception("最大列数不能小于最小列数");
                }
                DataTable csvDT = new DataTable();
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