如何将ListView控件选中的项向上移动或向下移动

yx_luko 2008-07-08 06:32:44

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Jinglecat 2008-07-09

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// eg.
Rearranger.MoveUp(listView1, listViewItem);

public static class Rearranger
{
public static int MoveDown(IList list, object item)
{
return MoveDown(list, item, 1);
}

public static int MoveDown(IList list, object item, int offset)
{
CheckOffset(offset);
return Move(list, item, offset * -1);
}

public static int MoveUp(IList list, object item, int offset)
{
CheckOffset(offset);
return Move(list, item, offset);
}

public static int MoveUp(IList list, object item)
{
return MoveUp(list, item, 1);
}

public static int MoveDown(IList list, int index)
{
return MoveDown(list, index, 1);
}

public static int MoveDown(IList list, int index, int offset)
{
CheckOffset(offset);
return Move(list, index, offset * -1);
}

public static int MoveUp(IList list, int index, int offset)
{
CheckOffset(offset);
return Move(list, index, offset);
}

public static int MoveUp(IList list, int index)
{
return MoveUp(list, index, 1);
}

public static int Move(IList list, int index, int offset)
{
object item = list[index];
return MoveIternal(list, item, index, offset);
}

public static int Move(IList list, object item, int offset)
{
int index = list.IndexOf(item);
return MoveIternal(list, item, index, offset);
}

public static int MoveIternal(IList list, object item, int index, int offset)
{
int newIndex = index - offset;
if (newIndex < 0)
{
newIndex = 0;
}
else if (newIndex > list.Count - 1)
{
newIndex = list.Count - 1;
}
//
list.RemoveAt(index);
list.Insert(newIndex, item);
return (newIndex - index);
}

private static void CheckOffset(int offset)
{
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", offset, "The offset must be larger than -1.");
}
}
}

pp_shy 2008-07-08

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ListViewItem lvSelectItem = this.listView1.SelectedItems[0];//获取选中项

ListViewItem lvDownItem = this.listView1.Items[this.listView1.SelectedItems[0].Index + 1];//获取选中项的下一项

ListViewItem lvUpItem = this.listView1.Items[this.listView1.SelectedItems[0].Index - 1];//获取选中项的上一项