【问题】
之前已经搞懂如何新建一个excel,写入header行,然后已经保存好了:
private void createOutputFile(string excelFullFilename) { bool isAutoFit = true; bool isHeaderBold = true; Excel.Application xlApp = new Excel.Application(); Excel.Workbook xlWorkBook; Excel.Worksheet xlWorkSheet; object misValue = System.Reflection.Missing.Value; xlApp = new Excel.ApplicationClass(); xlWorkBook = xlApp.Workbooks.Add(misValue); xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1); const int excelRowHeader = 1; const int excelColumnHeader = 1; //save header int curColumnIdx = 0 + excelColumnHeader; int rowIdx = 0 + excelRowHeader; xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "Title"; xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "Description"; const int constBullerLen = 5; for (int bulletIdx = 0; bulletIdx < constBullerLen; bulletIdx++) { int bulletNum = bulletIdx + 1; xlWorkSheet.Cells[rowIdx, curColumnIdx + bulletIdx] = "Bullet" + bulletNum.ToString(); } curColumnIdx = curColumnIdx + constBullerLen; const int constImgNameListLen = 5; for (int imgIdx = 0; imgIdx < constImgNameListLen; imgIdx++) { int imgNum = imgIdx + 1; xlWorkSheet.Cells[rowIdx, curColumnIdx + imgIdx] = "ImageFilename" + imgNum.ToString(); } curColumnIdx = curColumnIdx + constImgNameListLen; xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "HighestPrice"; xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "OneSellerIsAmazon"; xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "ReviewNumber"; xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "IsBestSeller"; //formatting //(1) header to bold if (isHeaderBold) { Range headerRow = xlWorkSheet.get_Range("1:1", System.Type.Missing); headerRow.Font.Bold = true; } //(2) auto adjust column width (according to content) if (isAutoFit) { Range allColumn = xlWorkSheet.Columns; allColumn.AutoFit(); } //output xlWorkBook.SaveAs(excelFullFilename, XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, XlSaveAsAccessMode.xlExclusive, XlSaveConflictResolution.xlLocalSessionChanges, misValue, misValue, misValue, misValue); xlWorkBook.Close(true, misValue, misValue); xlApp.Quit(); crl.releaseObject(xlWorkSheet); crl.releaseObject(xlWorkBook); crl.releaseObject(xlApp); }
现在需要用C#去打开已经存在的一个excel,并且找到最后一行,然后按行,继续添加内容。
【解决过程】
1.参考:
How to append existing excel file using C# ?
貌似给出办法了。
2.但是自己写代码期间,发现很多参数,给的不是很合适,所以又参考官网的:
去自己改改。
最终如下:
private void appendInfoToFile(string fullFilename, AmazonProductInfo productInfo) { Excel.Application xlApp; Excel.Workbook xlWorkBook; Excel.Worksheet xlWorkSheet; object missingVal = System.Reflection.Missing.Value; xlApp = new Microsoft.Office.Interop.Excel.Application(); //xlApp.Visible = true; //xlApp.DisplayAlerts = false; //http://msdn.microsoft.com/zh-cn/library/microsoft.office.interop.excel.workbooks.open%28v=office.11%29.aspx xlWorkBook = xlApp.Workbooks.Open( Filename : fullFilename, //UpdateLinks:3, ReadOnly : false, //Format : 2, //use Commas as delimiter when open text file //Password : missingVal, //WriteResPassword : missingVal, //IgnoreReadOnlyRecommended: false, //when save to readonly, will notice you Origin: Excel.XlPlatform.xlWindows, //xlMacintosh/xlWindows/xlMSDOS //Delimiter: ",", // usefule when is text file Editable : true, Notify : false, //Converter: missingVal, AddToMru: true, //True to add this workbook to the list of recently used files Local: true, CorruptLoad: missingVal //xlNormalLoad/xlRepairFile/xlExtractData ); //Get the first sheet xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1); //also can get by sheet name Excel.Range range = xlWorkSheet.UsedRange; //int usedColCount = range.Columns.Count; int usedRowCount = range.Rows.Count; const int excelRowHeader = 1; const int excelColumnHeader = 1; //int curColumnIdx = usedColCount + excelColumnHeader; int curColumnIdx = 0 + excelColumnHeader; //start from column begin int curRrowIdx = usedRowCount + excelRowHeader; // !!! here must added buildin excelRowHeader=1, otherwise will overwrite previous (added title or whole row value) xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.title; xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.description; const int constBullerLen = 5; int bulletListLen = 0; if (productInfo.bulletArr.Length > constBullerLen) { bulletListLen = constBullerLen; } else { bulletListLen = productInfo.bulletArr.Length; } for (int bulletIdx = 0; bulletIdx < bulletListLen; bulletIdx++) { xlWorkSheet.Cells[curRrowIdx, curColumnIdx + bulletIdx] = productInfo.bulletArr[bulletIdx]; } curColumnIdx = curColumnIdx + bulletListLen; const int constImgNameListLen = 5; int imgNameListLen = 0; if (productInfo.imgFullnameArr.Length > constImgNameListLen) { imgNameListLen = constImgNameListLen; } else { imgNameListLen = productInfo.imgFullnameArr.Length; } for (int imgIdx = 0; imgIdx < imgNameListLen; imgIdx++) { xlWorkSheet.Cells[curRrowIdx, curColumnIdx + imgIdx] = productInfo.imgFullnameArr[imgIdx]; } curColumnIdx = curColumnIdx + imgNameListLen; xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.highestPrice; xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.isOneSellerIsAmazon; xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.reviewNumber; xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.isBestSeller; ////http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=ZH-CN&k=k%28MICROSOFT.OFFICE.INTEROP.EXCEL._WORKBOOK.SAVEAS%29;k%28SAVEAS%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV3.5%22%29;k%28DevLang-CSHARP%29&rd=true //xlWorkBook.SaveAs( // Filename: fullFilename, // ConflictResolution: XlSaveConflictResolution.xlLocalSessionChanges //The local user's changes are always accepted. // //FileFormat : Excel.XlFileFormat.xlWorkbookNormal //); //if use above SaveAs -> will popup a window ask you overwrite it or not, even if you have set the ConflictResolution to xlLocalSessionChanges, which should not ask, should directly save xlWorkBook.Save(); //http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=ZH-CN&k=k%28MICROSOFT.OFFICE.INTEROP.EXCEL._WORKBOOK.CLOSE%29;k%28CLOSE%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV3.5%22%29;k%28DevLang-CSHARP%29&rd=true xlWorkBook.Close(SaveChanges : true); crl.releaseObject(xlWorkSheet); crl.releaseObject(xlWorkBook); crl.releaseObject(xlApp); }
【总结】
别人的代码,只是供参考,不能直接拷贝,因为很多内容写的不够清楚。
想要搞清楚内部的参数的详细含义,还是要去找官网的资料,其解释的很详细和清楚。
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