C# ListView 隐藏或折叠所选组
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ListView hide or collapse selected group
提问by sczdavos
How can I hide or collapse some group in ListView?
如何隐藏或折叠某些组ListView？
I just add some items
我只是添加了一些项目
contactListView.Items.Add(new ISIMlistViewItem(contact));
if (contact.availability == 6)
contactListView.Items[contact.identificator].Group = contactListView.Groups["offlineGroup"];
else
contactListView.Items[contact.identificator].Group = contactListView.Groups["onlineGroup"];
And I want to sometimes hide the offlineGroup.
我有时想隐藏offlineGroup.
if (hideOffline == true)
{
// something like
contactListView.Groups["offlineGroup"].Hide();
// or
contactListView.Groups["offlineGroup"].Visible = false;
}
But I don't know how can I do that. Can I just collapse it and don't draw it or is there any possibility to hide it?
但我不知道我该怎么做。我可以折叠它而不绘制它还是有可能隐藏它？
回答by Uwe Keim
It seems that the .NET version of the ListViewGroupclassdoes not provide a Collapseor Expandmethod.
似乎ListViewGroup该类的 .NET 版本没有提供CollapseorExpand方法。
Luckily, the native ListViewcontrol does support it and one guy provided an extension to enable expand and collapse.
幸运的是，本机ListView控件确实支持它，并且一个人提供了一个扩展来启用 expand 和 collapse。
Using his code you can then have a function to set the expand/collapse state with:
使用他的代码，您可以使用以下函数来设置展开/折叠状态：
private void SetGroupCollapse(GroupState state)
For hiding a complete group I would simply remove all the items in this group.
为了隐藏一个完整的组，我只需删除该组中的所有项目。
