小编kls*_*kls的帖子

 string field = ViewState["Field"].ToString();

 DataTable dt = (DataTable)Session["Academic"];
 foreach (DataRow dr in dt.Rows)
 {
      if (dr["Degree"].ToString() == field)
      {
            dr.Delete();
            dt.AcceptChanges();
      }
 }
 Session["Academic"] = dt;
 gdvwAcademic1.DataSource = Session["Academic"] as DataTable;
 gdvwAcademic1.DataBind();

执行此代码时会引发错误，因为“集合已修改，枚举操作可能无法执行”。为什么这样..？