C#如何读取Excel文件

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.Application excel=null;
 

Excel.Workbooks wbs=null;  

Excel.Workbook wb=null;  

Excel.Worksheet ws=null;  

Excel.Range range1=null;  

object Nothing=System.Reflection.Missing.Value;  

 

try  

{  

excel=new Excel.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"];
 

 

 

int rowCount=ws.UsedRange.Rows.Count;
 

int colCount=ws.UsedRange.Columns.Count;  

if(rowCount<=0)  

throw new InvalidFormatException  

("文件中没有数据记录");  

if(colCount<4)  

throw new InvalidFormatException  

("字段个数不对");  

 

for(int i=0;i{  

this.rowNo=i+1;  

object[]row=newobject[4];  

for(int j=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;  

 

DataRow dataRow=this.readExcel(row);  

 

if(this.isNullRecord==1)  

continue;  

 

d50b
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

private DataSet importExcelToDataSet  

(string FilePath)  

{  

string strConn;  

strConn="Provider=Microsoft.Jet.  

OLEDB.4.0;"+"DataSource="+FilePath+";
 

ExtendedProperties=Excel8.0;";  

OleDbConnection conn=new OleDbConnection  

(strConn);  

OleDbDataAdapter myCommand=new OleDbDataAdapter  

("SELECT *FROM [Sheet1$]",strConn);  

DataSetmy DataSet=new DataSet();  

try  

{  

myCommand.Fill(myDataSet);  

}  

catch(Exception ex)  

{  

throw new InvalidFormatException  

("该Excel文件的工作表的名字不正确,"+ex.Message);  

}  

returnmyDataSet;  

}

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