我的代码如下：
Excel.Application app= new Excel.Application();
Excel.Workbook xbook=app.Workbooks._Open(@"D:\Sample.xlt",Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value);
Excel.Worksheet xsheet=(Excel.Worksheet)xbook.Sheets[1];
xsheet = (Excel.Worksheet)app.ActiveSheet;
for(inti=0;i<datagridview1.RowCount;i++)
{//导入到Excel，从第五行开始写入数据。
app.cells[5+i,1] = datagridview1["Column1", i].Value.ToSteing();
app.cells[5+i,2] = datagridview1["Column2", i].Value.ToSteing();
app.cells[5+i,3] = datagridview1["Column3", i].Value.ToSteing();
app.cells[5+i,4] = datagridview1["Column4", i].Value.ToSteing();
app.cells[5+i,5] = datagridview1["Column5", i].Value.ToSteing();
app.cells[5+i,6] = datagridview1["Column6", i].Value.ToSteing();
app.cells[5+i,7] = datagridview1["Column7", i].Value.ToSteing();
app.cells[5+i,8] = datagridview1["Column8", i].Value.ToSteing();
}
message.box.Show("导入成功);
app.Visible=true;
当数据很多时，速度会很慢，望高人指点。给出一个好方法。最好有代码。谢谢！
