禁止ListView使所选项目为零

Question

我的项目是.NET/WinForms.

我有一个列表视图,总是填充项目.我希望它总是有选择.但是,如果单击列表视图项下方的空白区域,则会丢失选择.

该列表有多个selection = true和hide selection = false.

Answer 1

您需要阻止本机控件看到鼠标单击,以便它不会取消选择项目.在项目中添加一个新类并粘贴下面显示的代码.编译.将它从工具箱顶部放到表单上,替换现有表单.

using System;
using System.Drawing;
using System.Windows.Forms;

class MyListView : ListView {
    protected override void WndProc(ref Message m) {
        // Swallow mouse messages that are not in the client area
        if (m.Msg >= 0x201 && m.Msg <= 0x209) {
            Point pos = new Point(m.LParam.ToInt32());
            var hit = this.HitTest(pos);
            switch (hit.Location) {
                case ListViewHitTestLocations.AboveClientArea :
                case ListViewHitTestLocations.BelowClientArea :
                case ListViewHitTestLocations.LeftOfClientArea :
                case ListViewHitTestLocations.RightOfClientArea :
                case ListViewHitTestLocations.None :
                    return;
            }
        }
        base.WndProc(ref m);
    }
}