如何在文本框密码字段上禁用系统的大写锁定通知

问题描述

在 Winforms Textbox 中，我定义了新的 ToolTip 并进行了配置.我已将 PasswordChar 设置为*".但是，当大写锁定打开时，会显示两个 tooltip.其中一个是我的，另一个是系统默认的 tooltip 通知.我只想显示我的 tooltip.我想禁用系统的tooltip.如何禁用它?

In Winforms Textbox, I have defined new ToolTip and configured it. I have set the PasswordChar to '*'. However, when caps lock is on, two tooltip is shown. One of them is mine the other one is system's default tooltip notification. I only want to show my tooltip. I want to disable system's tooltip. How can I disable it?

推荐答案

一种方法是从现有的文本框控件派生您自己的文本框控件并处理 EM_SHOWBALLOONTIP 消息.然后只需将此控件拖到您的表单上，而不是常规的文本框控件.

One way is to derive your own textbox control from the existing one and handle the EM_SHOWBALLOONTIP message. Then just drag this control onto your form instead of the regular textbox control.

public partial class PasswordTextBox : TextBox
{
    private const int EM_SHOWBALLOONTIP = 0x1503;

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == EM_SHOWBALLOONTIP)
        {
            m.Result = (IntPtr)0;
            return;
        }
        base.WndProc(ref m);
    }

    public PasswordTextBox()
    {
        InitializeComponent();
    }
}

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