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【已解决】C#读取excel文件,并且追加内容到最后一行

C# crifan 3717浏览 0评论

【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:

Workbooks.Open Method

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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  1. 复制来有意思?
    yijiu9810个月前 (12-02)回复
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