当我对虚拟模式下的 ListView 的基础列表进行排序时，如何对选择进行排序？

发布于 2025-01-07 12:20:56 字数 388 浏览 0 评论 0原文

当 ListView 处于虚拟模式时，您负责向 ListView 提供与索引 对应的 ListItem >n 当它通过 OnRetrieveItem 事件询问时。

我根据自己的规则对列表进行排序，并告诉列表视图重新绘制：

listView1.Invalidate();

这很好。

除非用户选择了某些项目。现在，当树重新绘制时，会选择不同的项目。

对SelectedIndices进行排序的技术是什么？

但如果我整理我自己的个人清单

原文

When a ListView is in virtual mode, you are responsible for feeding the ListView a ListItem corresponding to index n when it asks through the OnRetrieveItem event.

i sort my list according to my own rules, and tell the listview to repaint:

listView1.Invalidate();

That's fine and dandy.

Except when the user has selected some items. Now when the tree repaints, different items are selected.

What is the technique to sort SelectedIndices?

But if i sort my own personal list

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靖瑶 2025-01-14 12:20:56

您需要存储选定的对象、排序、按新索引查找对象并重新选择它们。

代码可能看起来像这样（根据您的需要进行优化）：

void listView1_ColumnClick( object sender, ColumnClickEventArgs args )
{
    // Store the selected objects
    List<MyDataObject> selectedObjects = new List<MyDataObject>();
    foreach ( int index in listView1.SelectedIndices )
    {
        selectedObjects.Add( m_MyDataObjectsColl[index] );
    }

    // Clear all selected indices
    listView1.SelectedIndices.Clear();

    // Sort the list
    SortListView(listView1, args);

    // Reselect the objects according to their new indices
    foreach ( MyDataObject selectedObject in selectedObjects )
    {
        int index = m_MyDataObjectsColl.FindIndex(
                delegate( MyDataObject obj ) { return obj == selectedObject; }
            );
        listView1.SelectedIndices.Add( index );
    }
}

You'll need to store the selected objects, sort, find the objects by their new indices and reselect them.

The code could look something like this (optimize it as you see fit):

void listView1_ColumnClick( object sender, ColumnClickEventArgs args )
{
    // Store the selected objects
    List<MyDataObject> selectedObjects = new List<MyDataObject>();
    foreach ( int index in listView1.SelectedIndices )
    {
        selectedObjects.Add( m_MyDataObjectsColl[index] );
    }

    // Clear all selected indices
    listView1.SelectedIndices.Clear();

    // Sort the list
    SortListView(listView1, args);

    // Reselect the objects according to their new indices
    foreach ( MyDataObject selectedObject in selectedObjects )
    {
        int index = m_MyDataObjectsColl.FindIndex(
                delegate( MyDataObject obj ) { return obj == selectedObject; }
            );
        listView1.SelectedIndices.Add( index );
    }
}

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