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 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#入門知識 >> C#讀取csv格局文件的辦法

C#讀取csv格局文件的辦法

編輯:C#入門知識

C#讀取csv格局文件的辦法。本站提示廣大學習愛好者:(C#讀取csv格局文件的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#讀取csv格局文件的辦法正文


本文實例講述了C#讀取csv格局文件的辦法。分享給年夜家供年夜家參考。詳細完成辦法以下:

1、CSV文件規矩
 
1 開首是不留空,以行動單元。
2 可含或不含列名,含列名則居文件第一行。
3 一行數據不跨行,無空行。
4 以半角逗號(即,)作分隔符,列為空也要表達其存在。
5 列內容如存在半角逗號(即,)則用半角引號(即',')將該字段值包括起來。
6 列內容如存在半角引號(即")則應調換成半角雙引號("")本義,並用半角引號(即"")將該字段值包括起來。
7 文件讀寫時引號,逗號操作規矩互逆。
8 內碼格局不限,可為 ASCII、Unicode 或許其他。
9 不支撐特別字符
 
2、C#讀取csv文件的辦法

//讀CSV文件類,讀取指定的CSV文件,可以導出DataTable
    public class CsvStreamReader
    {
        private ArrayList rowAL;         //行鏈表,CSV文件的每行就是一個鏈
        private string fileName;        //文件名
        private Encoding encoding;        //編碼
        public CsvStreamReader()
        {
            this.rowAL = new ArrayList();
            this.fileName = "";
            this.encoding = Encoding.Default;
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="fileName">文件名,包含文件途徑</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,包含文件途徑</param>
        /// <param name="encoding">文件編碼</param>
        public CsvStreamReader(string fileName, Encoding encoding)
        {
            this.rowAL = new ArrayList();
            this.fileName = fileName;
            this.encoding = encoding;
            LoadCsvFile();
        }
        /// <summary>
        /// 文件名,包含文件途徑
        /// </summary>
        public string FileName
        {
            set
            {
                this.fileName = value;
                LoadCsvFile();
            }
        }
        /// <summary>
        /// 文件編碼
        /// </summary>
        public Encoding FileEncoding
        {
            set
            {
                this.encoding = value;
            }
        }
        /// <summary>
        /// 獲得行數
        /// </summary>
        public int RowCount
        {
            get
            {
                return this.rowAL.Count;
            }
        }
        /// <summary>
        /// 獲得列數
        /// </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>
        /// 獲得某行某列的數據
        /// 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
            {
                //數據有用性驗證
                CheckRowValid(row);
                CheckColValid(col);
                ArrayList colAL = (ArrayList)this.rowAL[row - 1];
                //假如要求列數據年夜於以後行的列時,前往空值
                if (colAL.Count < col)
                {
                    return "";
                }
                return colAL[col - 1].ToString();
            }
        }

        /// <summary>
        /// 依據最小行,最年夜行,最小列,最年夜列,來生成一個DataTable類型的數據
        /// 行等於1代表第一行
        /// 列等於1代表第一列
        /// maxrow: -1代表最年夜行
        /// maxcol: -1代表最年夜列
        /// </summary>
        public DataTable this[int minRow, int maxRow, int minCol, int maxCol]
        {
            get
            {
                //數據有用性驗證
                CheckRowValid(minRow);
                CheckMaxRowValid(maxRow);
                CheckColValid(minCol);
                CheckMaxColValid(maxCol);
                if (maxRow == -1)
                {
                    maxRow = RowCount;
                }
                if (maxCol == -1)
                {
                    maxCol = ColCount;
                }
                if (maxRow < minRow)
                {
                    throw new Exception("最年夜行數不克不及小於最小行數");
                }
                if (maxCol < minCol)
                {
                    throw new Exception("最年夜列數不克不及小於最小列數");
                }
                DataTable csvDT = new DataTable();
                int i;
                int col;
                int row;
                //增長列
                for (i = minCol; i <= maxCol; i++)
                {
                    csvDT.Columns.Add(i.ToString());
                }
                for (row = minRow; row <= maxRow; row++)
                {
                    DataRow csvDR = csvDT.NewRow();
                    i = 0;
                    for (col = minCol; col <= maxCol; col++)
                    {
                        csvDR[i] = this[row, col];
                        i++;
                    }
                    csvDT.Rows.Add(csvDR);
                }
                return csvDT;
            }
        }

        /// <summary>
        /// 檢討行數能否是有用的
        /// </summary>
        /// <param name="col"></param> 
        private void CheckRowValid(int row)
        {
            if (row <= 0)
            {
                throw new Exception("行數不克不及小於0");
            }
            if (row > RowCount)
            {
                throw new Exception("沒有以後行的數據");
            }
        }
        /// <summary>
        /// 檢討最年夜行數能否是有用的
        /// </summary>
        /// <param name="col"></param> 
        private void CheckMaxRowValid(int maxRow)
        {
            if (maxRow <= 0 && maxRow != -1)
            {
                throw new Exception("行數不克不及等於0或小於-1");
            }
            if (maxRow > RowCount)
            {
                throw new Exception("沒有以後行的數據");
            }
        }
        /// <summary>
        /// 檢討列數能否是有用的
        /// </summary>
        /// <param name="col"></param> 
        private void CheckColValid(int col)
        {
            if (col <= 0)
            {
                throw new Exception("列數不克不及小於0");
            }
            if (col > ColCount)
            {
                throw new Exception("沒有以後列的數據");
            }
        }
        /// <summary>
        /// 檢討檢討最年夜列數能否是有用的
        /// </summary>
        /// <param name="col"></param> 
        private void CheckMaxColValid(int maxCol)
        {
            if (maxCol <= 0 && maxCol != -1)
            {
                throw new Exception("列數不克不及等於0或小於-1");
            }
            if (maxCol > ColCount)
            {
                throw new Exception("沒有以後列的數據");
            }
        }
        /// <summary>
        /// 載入CSV文件
        /// </summary>
        private void LoadCsvFile()
        {
            //對數據的有用性停止驗證
            if (this.fileName == null)
            {
                throw new Exception("請指定要載入的CSV文件名");
            }
            else if (!File.Exists(this.fileName))
            {
                throw new Exception("指定的CSV文件不存在");
            }
            else
            {
            }
            if (this.encoding == null)
            {
                this.encoding = Encoding.Default;
            }
            StreamReader sr = new StreamReader(this.fileName, this.encoding);
            string csvDataLine;
            csvDataLine = "";
            while (true)
            {
                string fileDataLine;
                fileDataLine = sr.ReadLine();
                if (fileDataLine == null)
                {
                    break;
                }
                if (csvDataLine == "")
                {
                    csvDataLine = fileDataLine;//GetDeleteQuotaDataLine(fileDataLine);
                }
                else
                {
                    csvDataLine += "\\r\\n" + fileDataLine;//GetDeleteQuotaDataLine(fileDataLine);
                }
                //假如包括偶數個引號,解釋該行數據中湧現回車符或包括逗號
                if (!IfOddQuota(csvDataLine))
                {
                    AddNewDataLine(csvDataLine);
                    csvDataLine = "";
                }
            }
            sr.Close();
            //數據行湧現奇數個引號
            if (csvDataLine.Length > 0)
            {
                throw new Exception("CSV文件的格局有毛病");
            }
        }
        /// <summary>
        /// 獲得兩個持續引號釀成單個引號的數據行
        /// </summary>
        /// <param name="fileDataLine">文件數據行</param>
        /// <returns></returns>
        private string GetDeleteQuotaDataLine(string fileDataLine)
        {
            return fileDataLine.WordStr("\\"\\"", "\\"");
        }
        /// <summary>
        /// 斷定字符串能否包括奇數個引號
        /// </summary>
        /// <param name="dataLine">數據行</param>
        /// <returns>為奇數時,前往為真;不然前往為假</returns>
        private bool IfOddQuota(string dataLine)
        {
            int quotaCount;
            bool oddQuota;
            quotaCount = 0;
            for (int i = 0; i < dataLine.Length; i++)
            {
                if (dataLine[i] == '\\"')
                {
                    quotaCount++;
                }
            }
            oddQuota = false;
            if (quotaCount % 2 == 1)
            {
                oddQuota = true;
            }
            return oddQuota;
        }
        /// <summary>
        /// 斷定能否以奇數個引號開端
        /// </summary>
        /// <param name="dataCell"></param>
        /// <returns></returns>
        private bool IfOddStartQuota(string dataCell)
        {
            int quotaCount;
            bool oddQuota;
            quotaCount = 0;
            for (int i = 0; i < dataCell.Length; i++)
            {
                if (dataCell[i] == '\\"')
                {
                    quotaCount++;
                }
                else
                {
                    break;
                }
            }
            oddQuota = false;
            if (quotaCount % 2 == 1)
            {
                oddQuota = true;
            }
            return oddQuota;
        }
        /// <summary>
        /// 斷定能否以奇數個引號開頭
        /// </summary>
        /// <param name="dataCell"></param>
        /// <returns></returns>
        private bool IfOddEndQuota(string dataCell)
        {
            int quotaCount;
            bool oddQuota;
            quotaCount = 0;
            for (int i = dataCell.Length - 1; i >= 0; i--)
            {
                if (dataCell[i] == '\\"')
                {
                    quotaCount++;
                }
                else
                {
                    break;
                }
            }
            oddQuota = false;
            if (quotaCount % 2 == 1)
            {
                oddQuota = true;
            }
            return oddQuota;
        }
        /// <summary>
        /// 參加新的數據行
        /// </summary>
        /// <param name="newDataLine">新的數據行</param>
        private void AddNewDataLine(string newDataLine)
        {
            //System.Diagnostics.Debug.WriteLine("NewLine:" + newDataLine);
            ////return;
            ArrayList colAL = new ArrayList();
            string[] dataArray = newDataLine.Split(',');
            bool oddStartQuota;        //能否以奇數個引號開端
            string cellData;
            oddStartQuota = false;
            cellData = "";
            for (int i = 0; i < dataArray.Length; i++)
            {
                if (oddStartQuota)
                {
                    //由於後面用逗號朋分,所以要加上逗號
                    cellData += "," + dataArray[i];
                    //能否以奇數個引號開頭
                    if (IfOddEndQuota(dataArray[i]))
                    {
                        colAL.Add(GetHandleData(cellData));
                        oddStartQuota = false;
                        continue;
                    }
                }
                else
                {
                    //能否以奇數個引號開端
                    if (IfOddStartQuota(dataArray[i]))
                    {
                        //能否以奇數個引號開頭,不克不及是一個雙引號,而且不是奇數個引號
                        if (IfOddEndQuota(dataArray[i]) && dataArray[i].Length > 2 && !IfOddQuota(dataArray[i]))
                        {
                            colAL.Add(GetHandleData(dataArray[i]));
                            oddStartQuota = false;
                            continue;
                        }
                        else
                        {
                            oddStartQuota = true;
                            cellData = dataArray[i];
                            continue;
                        }
                    }
                    else
                    {
                        colAL.Add(GetHandleData(dataArray[i]));
                    }
                }
            }
            if (oddStartQuota)
            {
                throw new Exception("數據格局有成績");
            }
            this.rowAL.Add(colAL);
        }

        /// <summary>
        /// 去失落格子的首尾引號,把雙引號釀成單引號
        /// </summary>
        /// <param name="fileCellData"></param>
        /// <returns></returns>
        private string GetHandleData(string fileCellData)
        {
            if (fileCellData == "")
            {
                return "";
            }
            if (IfOddStartQuota(fileCellData))
            {
                if (IfOddEndQuota(fileCellData))
                {
                    return fileCellData.Substring(1, fileCellData.Length - 2).WordStr("\\"\\"", "\\""); //去失落首尾引號,然後把雙引號釀成單引號
                }
                else
                {
                    throw new Exception("數據引號沒法婚配" + fileCellData);
                }
            }
            else
            {
                //斟酌形如""    """"      """"""  
                if (fileCellData.Length > 2 && fileCellData[0] == '\\"')
                {
                    fileCellData = fileCellData.Substring(1, fileCellData.Length - 2).WordStr("\\"\\"", "\\""); //去失落首尾引號,然後把雙引號釀成單引號
                }
            }
            return fileCellData;
        }
    }

願望本文所述對年夜家的C#法式設計有所贊助。

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