C#中实现对Excel特定文本的搜索

 

打开Excel的VBA帮助,查看Excel的对象模型,很容易找到完成这个功能需要的几个集合和对象:

Application、Workbooks、 Workbook、Worksheets还有Worksheet和Range。

Application创建Excel应用,Workbooks打开 Excel文档,Workbook获得Excel文档工作薄,Worksheets操作工作表集合,Worksheet获得单个工作表。
搜索的思路对应上述集合和对象,可以这样表述:要搜索的文本可能存在Excel文档当中的某个工作表上,搜索应该遍历目标Excel文件的每个工作表中的有效区域,如果找到,则退出本次搜索,如果没有找到,则继续搜索直到完成本次搜索。   

跟Word对象模型不一样的是,Excel对象模型没有提供Find对象,不过没有关系,可以通过两种方法来实现,一个是通过Range对象的Find() 方法来实现; 另外一个比较麻烦,取得工作表Worksheet的有效区域UsedRange之后,遍历该Range对象中的所有行列。实际开发中,用第二 种方法时发现了一个特别的现象,所以第二种方法也准备详细记述一下。   

1. 打开Excel文档:

  object filename="";
  object MissingValue=Type.Missing;
  string strKeyWord=""; //指定要搜索的文本,如果有多个,则声明string[]
  Excel.Application ep=new Excel.ApplicationClass();
  Excel.Workbook ew=ep.Workbooks.Open(filename.ToString(),MissingValue,
   MissingValue,MissingValue,MissingValue,
   MissingValue,MissingValue,MissingValue,
   MissingValue,MissingValue,MissingValue,
   MissingValue,MissingValue,MissingValue,
   MissingValue);

2. 准备遍历Excel工作表

2.1 方法1

  Excel.Worksheet ews;
  int iEWSCnt=ew.Worksheets.Count;
  int i=0,j=0;
  Excel.Range oRange;
  object oText=strKeyWord.Trim().ToUpper();
  
  for(i=1;i<=iEWSCnt;i++)
  {
   ews=null;
   ews=(Excel.Worksheet)ew.Worksheets[i];
   oRange=null;
   (Excel.Range)oRange=((Excel.Range)ews.UsedRange).Find(
   oText,MissingValue,MissingValue,
   MissingValue,MissingValue,Excel.XlSearchDirection.xlNext,
   MissingValue,MissingValue,MissingValue);
   if (oRange!=null && oRange.Cells.Rows.Count>=1 && oRange.Cells.Columns.Count>=1)
   {
   MessageBox.Show("文档中包含指定的关键字!","搜索结果",MessageBoxButtons.OK);
   break;
   }
  } 

这里要说两个值得注意的地方。一个是遍历工作表的索引,不是从0开始,而是从1开始;另外一个是Find方法的第六个参数 SearchDirection,指定搜索的方向,帮助文档中说这个参数是可选项,但是我用MissingValue如论如何编译不能通过,不知什么原 因,于是显式指定它的默认值xlNext。

2.2 方法2
第一种方法实现了,再看看第二种方法。这种方法除了要遍历工作表,还要对工作表使用区域的行和列进行遍历。其它一样,只对遍历说明,代码如下:

  bool blFlag=false;
  int iRowCnt=0,iColCnt=0,iBgnRow,iBgnCol; 
  for(m=1;m<=iEWSCnt;m++)
  {
   ews=(Excel.Worksheet)ew.Worksheets[m];
   iRowCnt=0+ews.UsedRange.Cells.Rows.Count;
   iColCnt=0+ews.UsedRange.Cells.Columns.Count;
   iBgnRow=(ews.UsedRange.Cells.Row>1)? ews.UsedRange.Cells.Row-1:ews.UsedRange.Cells.Row;
   iBgnCol=(ews.UsedRange.Cells.Column>1)? ews.UsedRange.Cells.Column-1:ews.UsedRange.Cells.Column;
  
   for(i=iBgnRow;i
   {
   for(j=iBgnCol;j
   {
   strText=((Excel.Range)ews.UsedRange.Cells[i,j]).Text.ToString();
   if (strText.ToUpper().IndexOf(strKeyWord.ToUpper())>=0)
   {
   MessageBox.Show("文档中包含指定的关键字!","搜索结果",MessageBoxButtons.OK);
   }
   }
   }
  } 

 显然这种方法比第一种繁琐得多,不过这里有一个关于遍历单元格的索引很特别的地方,当工作表中的使用区域UsedRange为单行单列的时候,对 UsedRange中的单元格遍历起始索引值为1,为多行多列的时候,起始索引值为0,不知这是Excel程序设计者出于什么样的考虑?

2.3 方法二补充案例

有效数据的行列数,可以通过下面的代码获取。

 nUsedRow = sheet.UsedRange.Rows.Count;
 nUsedCol =  sheet.UsedRange.Columns.Count;

本文表示对参考文章1,文章2.2中原作者所说的那种奇怪的现象表示质疑,并不会出现那种情况。 2016-8-27

准备工作

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);
        }
View Code

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。

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);
        }
View Code

参考文章

1.C#编程实现Excel文档中搜索文本内容的方法及思路 ,2013-7

2.How to append existing excel file using C# ?

3.MSDN, Workbooks.Open Method

4. C#读取excel文件,并且追加内容到最后一行

原文地址:https://www.cnblogs.com/arxive/p/5813901.html