<C#>读Excel文件

           第一种Excel文件就是Microsoft Office的。它的格式就是.xlsx等。我们要读其中内容，首先就是找着Microsoft.Office.Interop.Excel.dll和Office.dll两个dll文件。它一般是藏在C:\Program Files (x86)\Microsoft Visual Studio 11.0\Visual Studio Tools for Office\PIA\Office14中，依次找下去就可得到。在Visual Studio2012的步骤就是，先点击Solution Explorer中程序的reference--->Add Reference--->Browse--->就是刚才路径--->OK。其次就是using Excel = Microsoft.Office.Interop.Excel;最后就是写代码。如下所示，先新建Application，接着就是Workbook/Worksheet,最后就是读sheet的值了。

 Excel.Application app = new Excel.Application();
                Excel.Workbook srcBook = app.Workbooks.Open(sourcePath);

                FileStream fs = new FileStream("D://a.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
                StreamWriter sw = new StreamWriter(fs);

                try
                {
                    foreach (Excel.Worksheet sheet in srcBook.Worksheets)
                    {
                        for (int i = 1; i <= sheet.UsedRange.Rows.Count; i++)
                        {
                            for (int j = 1; j <= sheet.UsedRange.Columns.Count; j++)
                            {
                                if (sheet.Cells[i, j].Interior.Color != ColorTranslator.ToOle(Color.FromArgb(255, 204, 153)))
                                {
                                    string src= sheet.Cells[i, j].Value == null ? string.Empty : sheet.Cells[i, j].Value.ToString();
                                    sw.WriteLine(src);
                                }
                            }
                        }
                    }
                    sw.WriteLine("END");
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    sw.Flush();
                    sw.Close();
                    app.Application.DisplayAlerts = false;
                    srcBook.Save();

                    app.Quit();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(srcBook);
                    app = null;
                    srcBook = null;
                    GC.Collect();
                }

            第二种就是WPS Office的Excel文件。它的格式就是.xls等。它的过程类似如上。首先就是获得相应dll文件，如先Reference--->COM--->Type Libraries--->KingSoft ET2.0 ObjectLibrary.dll--->OK.其次就是Using ET;最后就是代码应用了。代码如下所示：

 ET.Application app = new ET.Application();
                ET.workbook srcBook = new ET.workbook();
                srcBook = (ET.workbook)app.Workbooks.Open(sourcePath);

                FileStream fs = new FileStream("D://a.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
                StreamWriter sw = new StreamWriter(fs);

                try
                {
                    foreach (ET.Worksheet sheet in srcBook.Worksheets)
                    {
                        for (int i = 1; i <= sheet.UsedRange.Rows.Count; i++)
                        {
                            for (int j = 1; j <= sheet.UsedRange.Columns.Count; j++)
                            {
                                if (sheet.Cells[i, j].Interior.Color != ColorTranslator.ToOle(Color.FromArgb(255, 204, 153)))
                                {
                                    string src = sheet.Cells[i, j].Value == null ? string.Empty : sheet.Cells[i, j].Value.ToString();
                                    sw.WriteLine(src);
                                }
                            }
                        }
                    }
                    sw.WriteLine("END");
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    sw.Flush();
                    sw.Close();
                    app.Application.DisplayAlerts = false;
                    srcBook.Save();

                    app.Quit();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(srcBook);
                    app = null;
                    srcBook = null;
                    GC.Collect();
                }