C# 我获得二进制文件流怎么转化为EXCEL对象？之前是通过路径去拿一个EXCEL文件现在只有一个文件流

Application app = new Application();
Workbooks wbs = app.Workbooks;
_Workbook _wbk = wbs.Add(@"路径");
Sheets shs = _wbk.Sheets;
_Worksheet _wsh = (_Worksheet)shs.get_Item(1);

publicDataSet ImportExcel(string strFileName) //strFileName指定的路径+文件名.xls
{
if (strFileName != "")
{
string conn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strFileName + ";Extended Properties=Excel 8.0";
string sql = "select * from [Sheet1$]";
OleDbDataAdapter da = newOleDbDataAdapter(sql, conn);
DataSet ds = newDataSet();
try
{
da.Fill(ds, "datatable");
}
catch
{

}
return ds;
}
else
{
return null;
}
}

这个方法我经常用，转成dataset和datatable没什么太大区别吧，反正ds.Tables[0]就是dataTable了

<p>直接输入流 可以参考我以前写的一篇文章 <a href="http://wenwen.soso.com/z/urlalertpage.e?sp=shttp%3a%2f%2fblog.sina.com.cn%2fs%2fblog_60d07c310100qczn.html" target="_blank">http://blog.sina.com.cn/s/blog_60d07c310100qczn.html</a></p>