这篇文章主要讲解了“怎么用C#读取Excel文件”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“怎么用C#读取Excel文件”吧!
C#读取Excel文件方法一:直接读取(这种直接读取单元格的方法释放很重要)
Excel.Applicationexcel=null; Excel.Workbookswbs=null; Excel.Workbookwb=null; Excel.Worksheetws=null; Excel.Rangerange1=null; objectNothing=System.Reflection.Missing.Value; try { excel=newExcel.Application(); excel.UserControl=true; excel.DisplayAlerts=false; excel.Application.Workbooks.Open(this. FilePath,Nothing,Nothing,Nothing,Nothing, Nothing,Nothing,Nothing,Nothing,Nothing, Nothing,Nothing,Nothing); wbs=excel.Workbooks; wb=wbs[1]; ws=(Excel.Worksheet)wb.Worksheets["Sheet2"]; introwCount=ws.UsedRange.Rows.Count; intcolCount=ws.UsedRange.Columns.Count; if(rowCount<=0) thrownewInvalidFormatException ("文件中没有数据记录"); if(colCount<4) thrownewInvalidFormatException ("字段个数不对"); for(inti=0;i{ this.rowNo=i+1; object[]row=newobject[4]; for(intj=0;j<4;j++) { range1=ws.get_Range(ws.Cells[i+2,j+1], ws.Cells[i+2,j+1]); row[j]=range1.Value; if(row[0]==null) { this.isNullRecord++; break; } } if(this.isNullRecord>0) continue; DataRowdataRow=this.readExcel(row); if(this.isNullRecord==1) continue; if(this.verifyData(dataRow)==false) errFlag++; this.updateTableCurr(dataRow); } } finally { if(excel!=null) { if(wbs!=null) { if(wb!=null) { if(ws!=null) { if(range1!=null) { System.Runtime.InteropServices.Marshal. ReleaseComObject(range1); range1=null; } System.Runtime.InteropServices.Marshal. ReleaseComObject(ws); ws=null; } wb.Close(false,Nothing,Nothing); System.Runtime.InteropServices.Marshal. ReleaseComObject(wb); wb=null; } wbs.Close(); System.Runtime.InteropServices.Marshal. ReleaseComObject(wbs); wbs=null; } excel.Application.Workbooks.Close(); excel.Quit(); System.Runtime.InteropServices.Marshal. ReleaseComObject(excel); excel=null; GC.Collect(); } }
C#读取Excel文件方法二:通过OleDb连接,把excel文件作为数据源来读取(这里是fill进dataset,也可以返回OleDbDataReader来逐行读,数据较快)
注:这种方法容易把混合型的字段作为null值读取进来,解决办法是改造连接字符串
strConn = "Provider=Microsoft.Jet. OLEDB.4.0;Data Source=C:\\Erp1912.xls;Extended Properties='Excel8.0;HDR=Yes;IMEX=1'";
通过Imex=1来把混合型作为文本型读取,避免null值,来实现C#读取Excel文件
privateDataSetimportExcelToDataSet (stringFilePath) { stringstrConn; strConn="Provider=Microsoft.Jet. OLEDB.4.0;"+"DataSource="+FilePath+"; ExtendedProperties=Excel8.0;"; OleDbConnectionconn=newOleDbConnection (strConn); OleDbDataAdaptermyCommand=newOleDbDataAdapter ("SELECT*FROM[Sheet1$]",strConn); DataSetmyDataSet=newDataSet(); try { myCommand.Fill(myDataSet); } catch(Exceptionex) { thrownewInvalidFormatException ("该Excel文件的工作表的名字不正确,"+ex.Message); } returnmyDataSet; }
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