在RowCommand事件中获取索引值示例代码

protected void lpg_RowCommand(object sender, GridViewCommandEventArgs e) 

{ 

if (e.CommandName == "ItemCollect") 
{ 
GridViewRow gvr = (GridViewRow)(((LinkButton)(e.CommandSource)).NamingContainer); 
LinkButton lk = lpgKnowledgeExchange.Rows[gvr.RowIndex].FindControl("lbtnCollect") as LinkButton; 

} 

} 
 
2.如果是模板列中的button直接click事件 

利用sender 取其parent 也可以实现