将选择所有快捷方式(Ctrl + A)添加到.net列表视图？

Question

就像主题说我有一个listview,我想添加Ctrl+ Aselect all快捷方式.我的第一个问题是我无法弄清楚如何以编程方式选择列表视图中的所有项目.它似乎应该相对容易,比如ListView.SelectAll()或ListView.Items.SelectAll(),但似乎并非如此.我的下一个问题是如何定义键盘快捷键ListView.我是否在某个KeyUp活动中这样做,但那你怎么一次检查两台印刷机？或者它是你设置的属性？

这里的任何帮助都会很棒.

Answer 1

你可以用这样的东西完成两件事:

private void listView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.A && e.Control)
    {
        listView1.MultiSelect = true;
        foreach (ListViewItem item in listView1.Items)
        {
            item.Selected = true;
        }
    }
}

Answer 2

这些适用于小型列表,但如果虚拟列表中有100,000个项目,则可能需要很长时间.这可能是你的目的矫枉过正,但以防万一::

class NativeMethods {
    private const int LVM_FIRST = 0x1000;
    private const int LVM_SETITEMSTATE = LVM_FIRST + 43;

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct LVITEM
    {
        public int mask;
        public int iItem;
        public int iSubItem;
        public int state;
        public int stateMask;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pszText;
        public int cchTextMax;
        public int iImage;
        public IntPtr lParam;
        public int iIndent;
        public int iGroupId;
        public int cColumns;
        public IntPtr puColumns;
    };

    [DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = CharSet.Auto)]
    public static extern IntPtr SendMessageLVItem(IntPtr hWnd, int msg, int wParam, ref LVITEM lvi);

    /// <summary>
    /// Select all rows on the given listview
    /// </summary>
    /// <param name="list">The listview whose items are to be selected</param>
    public static void SelectAllItems(ListView list) {
        NativeMethods.SetItemState(list, -1, 2, 2);
    }

    /// <summary>
    /// Deselect all rows on the given listview
    /// </summary>
    /// <param name="list">The listview whose items are to be deselected</param>
    public static void DeselectAllItems(ListView list) {
        NativeMethods.SetItemState(list, -1, 2, 0);
    }

    /// <summary>
    /// Set the item state on the given item
    /// </summary>
    /// <param name="list">The listview whose item's state is to be changed</param>
    /// <param name="itemIndex">The index of the item to be changed</param>
    /// <param name="mask">Which bits of the value are to be set?</param>
    /// <param name="value">The value to be set</param>
    public static void SetItemState(ListView list, int itemIndex, int mask, int value) {
        LVITEM lvItem = new LVITEM();
        lvItem.stateMask = mask;
        lvItem.state = value;
        SendMessageLVItem(list.Handle, LVM_SETITEMSTATE, itemIndex, ref lvItem);
    }
}

你像这样使用它::

NativeMethods.SelectAllItems(this.myListView);

Answer 3

private void listView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyData == (Keys.A | Keys.Control))
        foreach (ListViewItem item in listView1.Items)
            item.Selected = true;
}

要只去做就按Ctrl + A,不是像按Ctrl + Shift + A等其他组合