C# 用循环来遍历无限级分类
//为下拉框填充数据无限级分类，用循环完成 public void DropClass() { //效率太低,已经不用了
string sql, ids, f_id, str;
int tempi, i, j;
tempi = 0; ids = "-1"; str = ""; sql = "select * from News_type where fid=0 order by fid,sortnum"; SqlDataReader oRs, Rs, Mys, frs; Rs = MyData.ExecuteReader(sql); i = 0; while (Rs.Read()) {
News_lb.Items.Insert(i, new ListItem(MyData.DelHTML(Rs["ClassName"].ToString()), Rs["id"].ToString())); i = i + 1; f_id = Rs["id"].ToString(); ids = ids + "," + Rs["id"].ToString(); do { sql = "select * from News_type where fid=" + f_id + " and id not in(" + ids + ") order by fid,sortnum"; oRs = MyData.ExecuteReader(sql);
if (!oRs.Read()) { sql = "select * from News_type where fid=(select fid from News_type where id=" + f_id + ") and id not in(" + ids + ") order by fid,sortnum"; Mys = MyData.ExecuteReader(sql); if (Mys.Read()) { if (Mys["fid"].ToString() == "0") { break; }
for (j = 1; j <= tempi * 2; j++) { str = str + " "; } News_lb.Items.Insert(i, new ListItem(str + MyData.DelHTML(Mys["ClassName"].ToString()), Mys["id"].ToString())); i = i + 1; ids = ids + "," + Mys["id"].ToString(); f_id = Mys["id"].ToString(); str = "";
} else { tempi = tempi - 1; sql = "select * from News_type where id=" + f_id + " order by fid,sortnum"; frs = MyData.ExecuteReader(sql); if (frs.Read()) { f_id = frs["fid"].ToString(); if (f_id == "0") { break; }
} frs.Close(); } Mys.Close();
} else {
tempi = tempi + 1; for (j = 1; j <= tempi * 2; j++) { str = str + " "; }
News_lb.Items.Insert(i, new ListItem(str + MyData.DelHTML(oRs["ClassName"].ToString()), oRs["id"].ToString())); str = ""; i = i + 1; f_id = oRs["id"].ToString(); ids = ids + "," + oRs["id"].ToString();
} oRs.Close();
} while (1 == 1);
} Rs.Close();
} //为下拉框填充数据无限级分类，用循环完成