[英]Nested list of SQL query result
運行查詢后,將結果保存到dataTable中,如下所示(這只是簡化的結果集):
food_cat food
-----------------------
vegit carrot
vegit onion
vegit tomato
fruit cherry
fruit banana
fruit orange
我想在無序列表中列出按food_cat
分組的結果。
<h3> Vegit </h3>
<ul>
<li>carrot</li>
<li>onion</li>
<li>tomato</ti>
</ul>
<h3>fruit</h3>
<ul>
<li>cherry</li>
<li>banana</li>
<li>orange</li>
</ul>
我已經嘗試了一些for
, if
, while
控制,但無法找到一個很好的解決方案。
由於您不提供表格名稱等。我將嘗試以一般方式給出答案。
string previous_food_cat = '';
bool firstEntrance = true
while(trace resultSet until no elements left)
{
if resultSet.food_cat != previous_food_cat //check if food_cat value changed
{
if (!firstEntrance) //if not first entrance close the <ul> tag before opening new one
{
print </ul>
}
print <h3> resultSet.food_cat </h3> //open new <h3> tag
print <ul> //open new <ul> tag
previous_food_cat = resultSet.food_cat //update previous_food_cat for new food_cat value
firstEntrance = false //set firstEntrance false so that ul tqags should be closed
}
print <li> resultSet.food </li>
}
謝謝@zibidyum,您的技術使我達成了解決方案。 但是最終的解決方案在這里:
public bool firstcat; // defined at before Page_Load method
public int temp_cat; // defined at before Page_Load method
for (int i = 0; i < dt.Rows.Count; i++)
{
if (temp_cat != Convert.ToInt32(dt.Rows[i]["food_cat"]))
{
if (i > 0 && !firstcat)
content.InnerHtml += "</ul>"; //solution's most critic point is here
content.InnerHtml += "<ul>"
}
content.InnerHtml += String.Format("<li>{0}</li>", dt.Rows[i]["food"].ToString());
temp_cat = Convert.ToInt32(dt.Rows[i]["food_cat"]);
}
歡迎任何更好的解決方案,建議和/或想法。
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