Question

我正在使用Microsoft Visual Studio 2013并使用c＃编写。我编写了TabControl类的后代并重写了OnClick方法，然后更改了现有的TabControl元素以使用新类。一切都编译并运行，我的构造函数中的断点已到达，但它没有使用OnClick覆盖！这是TabControl后代代码，提前感谢您的帮助！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace LumaSense.Imaging.Calibration.UI
{
    public partial class TabControlModified : TabControl
    {
        public TabControlModified()
        {
            InitializeComponent();
        }

        private bool superuser;
        public int lastTabSelectedIndex = 0;

        public bool Superuser
        {
            get { return superuser; }
            set { superuser = value; }
        }

        public int LastTabSelectedIndex
        {
            get { return lastTabSelectedIndex; }
            set
            { this.lastTabSelectedIndex = value; }
        }

        protected override void OnClick(EventArgs e)
        {
            // SelectedIndex and tab have already changed before we get here
            if (this.superuser == false)
            {
                if (this.SelectedIndex <= this.lastTabSelectedIndex)
                {
                    this.LastTabSelectedIndex = this.SelectedIndex;
                    base.OnClick(e);
                }
                else
                {
                    base.OnClick(e);
                    this.SelectedIndex = lastTabSelectedIndex;
                }
            }
            else
            {
                this.LastTabSelectedIndex = this.SelectedIndex;
                base.OnClick(e);
            }
        }
    }
}

Answer 1

这个代码段运行得很好。您需要确保已将选项卡控件添加到选项卡控件中，以便显示选项卡并供用户单击使用。

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        var mTab = new MyTab();
        mTab.Location = new System.Drawing.Point(100, 100);

        // The OnClick will only work on the 
        // Tabs themselves so Pages must be added to display the Tabs.
        var mtabPage1 = new System.Windows.Forms.TabPage();
        mTab.Controls.Add(mtabPage1);

        this.Controls.Add(mTab);
    }

    class MyTab : TabControl
    {
        protected override void OnClick(EventArgs e)
        {
            MessageBox.Show("I was clicked.");

            base.OnClick(e);
        }
    }
}

Answer 2

我发现使用取消选择和选择而不是创建TabControl的后代修复了问题。不知何故，当使用TabControl后代时，添加TabControlModified .SelectedIndex的Reactive UI绑定搞砸了事情并且不再调用被覆盖的OnClick。

重写的c＃TabControl OnClick未被调用

2 个答案: