关键新闻事件不起作用

问题描述

我遇到了按键事件的问题。当我在textbox1中输入10位数时，它需要10位数。但是当我清除textbox1按退格键然后再输入数字时，它只需9位数就是我的问题。请告诉我我的代码出现了什么问题，如

I have problem with keypress event. when i enter 10 digits in textbox1 it takes 10 digits as i want. but when i clear textbox1 pressing backspace and now enter digits again it takes only 9 digits that is my problem. please tell me what's going wrong with my code is given as under

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar != '\b' && textBox4.Text.Trim().Length > 9)
    {
        //here '\b' is for backspace
        e.Handled = true;
        MessageBox.Show("You can't enter more than ten digits...");
        textBox4.MaxLength = 9;
    }
}

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