blocks|key|761488|text|我会在dropbox中添加一个标识Id或类，然后使用Javascript删除。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|761489|here这篇文章应该会有所帮助。|offset|length|761490|D|761491|entityMap|0|LINK|mutability|MUTABLE|url|http://www.plus2net.com/javascript_tutorial/list-remove.php^0|0|0|4|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

I would add an identifying Id or class to the dropbox and remove using Javascript.

The article <a href="http://www.plus2net.com/javascript_tutorial/list-remove.php" rel="nofollow">here</a> should help.

D

blocks|key|977056|text|您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|977057|myDropDown.Items.Remove(ListItem+li);|code-block|syntax|javascript|977058|或|977059|myDropDown.Items.RemoveAt(int+index);|977060|使用C#将其删除。|977061|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can use the

<pre><code>myDropDown.Items.Remove(ListItem li);
</code></pre>

or

<pre><code>myDropDown.Items.RemoveAt(int index);
</code></pre>

to remove it using C#.

blocks|key|761542|text|正如其他人回答的那样，你需要这样做；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|761543|myDropDown.Items.Remove(ListItem+li);|code-block|syntax|javascript|761544|但是，如果希望页面异步刷新，则下拉列表需要位于asp:UpdatePanel中|offset|length|style|CODE|761545|在执行Remove调用之后，您需要调用：|761546|yourPanel.Update();|761547|entityMap^0|0|0|N|F|0|3|6|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@$I|Y|J|Z|K|L]]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

As other people have answered, you need to do;

<pre><code>myDropDown.Items.Remove(ListItem li);
</code></pre>

but if you want the page to refresh asynchronously, the dropdown needs to be inside an <code>asp:UpdatePanel</code>

after you do the <code>Remove</code> call, you need to call:

<pre><code>yourPanel.Update();
</code></pre>

blocks|key|977110|text|代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|977111|ListItem+removeItem=+myDropDown.Items.FindByValue("TextToFind");
drpCategory.Items.Remove(removeItem);|code-block|syntax|javascript|977112|将"TextToFind“替换为要删除的项目。|977113|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Code:

<pre><code>ListItem removeItem= myDropDown.Items.FindByValue("TextToFind");
drpCategory.Items.Remove(removeItem);
</code></pre>

Replace "TextToFind" with the item you want to remove.

blocks|key|761590|text|您可以使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|761591|myDropDown.Items.Remove(myDropDown.Items.FindByValue("TextToFind"));|code-block|syntax|javascript|761592|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use this:

<pre><code>myDropDown.Items.Remove(myDropDown.Items.FindByValue("TextToFind"));
</code></pre>

blocks|key|761606|text|myDropDown.Items.Remove(myDropDown.Items.FindByText("TextToFind"))|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|761607|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>myDropDown.Items.Remove(myDropDown.Items.FindByText("TextToFind"))
</code></pre>

blocks|key|977157|text|myDropDown.Items.Remove(myDropDown.Items.FindByText("Chicago"))；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|977158|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

myDropDown.Items.Remove(myDropDown.Items.FindByText("Chicago"));

blocks|key|761651|text|我已经这样做了，我已经删除了所有的项目，除了值为1和3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|761652|ListItemCollection+liCol+=+ddlcustomertype.Items;
for+(int+i+=+0;+i+<+liCol.Count;i%2B%2B+)
{
++++ListItem+li+=+liCol[i];
++++if+(li.Value+!=+"1"+%7C%7C+li.Value+!=+"3")
++++++++ddlcustomertype.Items.Remove(li);
}|code-block|syntax|javascript|761653|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have Done Like this, i have remove all items except the value coming as 1 and 3.

<pre><code>ListItemCollection liCol = ddlcustomertype.Items;
for (int i = 0; i &lt; liCol.Count;i++ )
{
 ListItem li = liCol[i];
 if (li.Value != "1" || li.Value != "3")
 ddlcustomertype.Items.Remove(li);
}
</code></pre>

blocks|key|761677|text|要插入DropDownList，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|761678|DropDownList.Items.Insert(0,+new+ListItem("--+Select+item+--",+"0"));|code-block|syntax|javascript|761679|并从DropDownList中删除项目：|761680|DropDownList.Items.Remove(new+ListItem("--+Select+item+--",+"0"));|761681|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

to insert into DropDownList:
<pre><code>DropDownList.Items.Insert(0, new ListItem(&quot;-- Select item --&quot;, &quot;0&quot;));
</code></pre>
and to remove item from DropDownList:
<pre><code>DropDownList.Items.Remove(new ListItem(&quot;-- Select item --&quot;, &quot;0&quot;));
</code></pre>

I have a dropdownlist, and in some cases need to remove an item (in the code-behind). I need to remove the item based on the value of the item.

How can I do this?

asp.net: How can I remove an item from a dropdownlist?

我有一个下拉列表，在某些情况下需要删除一个项目(在代码隐藏中)。我需要根据该项目的值删除该项目。我该怎么做呢？

问asp.net:如何从下拉列表中删除项目？
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