读取文件将 Excel 文件 转换成 CSV 文件 解决方案

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    做法：从excel中把数据读取出来，然后每一个单元格的值用逗号开隔，再拼起来，保存到一个.csv文件中。

    

    using System.IO;

using Excel;

using System.Data;

    

    须要引用 ExcelDataReader 开源项目 中的2个DLL: Excel.dll  和 ICSharpCode.SharpZipLib.dll

    以下是只读取第一个 sheet 内容的例样。

public static bool ReadSheet1(string sXlsxFile,out string sError)
        {
            sError = "";

            try
            {
                string filePath = sXlsxFile;
                FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read);

                //// Reading from a binary Excel file ('97-2003 format; *.xls)
                //IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);

                // Reading from a OpenXml Excel file (2007 format; *.xlsx)
                IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);

                // DataSet - The result of each spreadsheet will be created in the result.Tables
                DataSet result = excelReader.AsDataSet();

                string sSheet1 = result.Tables[0].TableName.ToString(); // to get first sheet name (table name)

                StringBuilder csvData = new StringBuilder();
                int row_no = 0;
                int ind = 0;

                while (row_no < result.Tables[ind].Rows.Count) // ind is the index of table
                // (sheet name) which you want to convert to csv
                {
                    for (int i = 0; i < result.Tables[ind].Columns.Count; i++)
                    {
                        csvData.Append(result.Tables[ind].Rows[row_no][i].ToString() + ",");
                    }
                    row_no++;
                    csvData.Append("\n");
                }

                string output = filePath.Replace(".xlsx", ".csv"); // define your own filepath & filename
                StreamWriter csv = new StreamWriter(@output, false);
                csv.Write(csvData);
                csv.Close();

                // Free resources (IExcelDataReader is IDisposable)
                excelReader.Close();
            }
            catch (Exception ex)
            {
                sError = ex.Message;
            }

            return sError.Trim() == "";
        }