【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。
转载请注明：在路上 » 【已解决】C#读取excel文件，并且追加内容到最后一行