如何创建继承自 TextBox 的类 [英] How to create class that inherits from TextBox

问题描述

我想做一个继承TextBox的自定义TextBox类并覆盖 onKeyDown 事件以在按下 Enter 键时启用 Tab 功能.

I want to make a custom TextBox class that inherits TextBox and overrides onKeyDown event to make Tab functionality when key Enter is pressed.

这个问题有重复，但我找到的答案都没有意义，所以我想开始新的讨论.

There is duplicates of this question but none of the answers I found make sense so I want to open a fresh discussion.

我不想从 UserControl 而是从 TextBox 继承...这真的很难吗?我似乎无法找到有关如何执行此操作的直接教程或示例.

I don't want to Inherit from UserControl but from TextBox... is this really that hard to do? I can't seem to find straightfoward tutorial or example on how to do this.

像这样:

public partial class CustomTextBox : TextBox
{
    public CustomTextBox()
    {
        this.KeyDown += customKeyDown;
    }

    void customKeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            SendKeys.Send("{TAB}");
        }
    }
}

请记住，我在使用 UserControls 或 CustomControls 方面的经验很少，而且是很久以前的事了，所以我忘记了关键的事情

Please keep in mind that I have very little experience with working with UserControls or CustomControls and it was long time ago so I forgot the key things

推荐答案

您只需覆盖 OnKeyDown 事件处理程序，此处无需 UserControl.

You just override OnKeyDown event handler, no need for UserControl here.

当在单行或多行文本框中按下 ENTER 键时，下面的类将移动到下一个控件.多行时，可以通过按 SHIFT+ENTER 插入 ENTER.

Class below moves to next control when ENTER key is pressed in single- or multiline textbox. When multiline, ENTER can be inserted by pressing SHIFT+ENTER.

作为额外的奖励，烦人的叮"声被抑制了(以最简单的方式，如果您不需要处理控制范围外的按键，效果会很好).

As added bonus, annoying "ding" sound is suppressed (in simplest possible way which works well if you do not need to handle the key outside the control).

namespace YourNameSpace
{
    public class CustomTextBox : TextBox
    {
        protected override void OnKeyDown(KeyEventArgs e)
        {
            base.OnKeyDown(e);

            if (e.KeyCode == Keys.Enter && (!Multiline || Multiline && !e.Shift))
            {
                SendKeys.Send("{TAB}");
                // Removes "ding" sound by NOT passing the key down to container
                e.SuppressKeyPress = true;
            }
        }
    }
}

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