如何在TextBox的文本更改事件中使用IF语句

Question

private void textBox1_TextChanged(object sender, EventArgs e)
{
    if (a.Equals(b))
    {
        result = a.ToString();
        textBox1.Text = result;
        textBox1.TextAlign = HorizontalAlignment.Left;
    }
    else
        result = b.ToString();
    textBox1.Text = result;
    textBox1.TextAlign = HorizontalAlignment.Center;
}

Answer 1

很可能你忘记在else语句中添加括号。

试试这段代码：

private void textBox1_TextChanged(object sender, EventArgs e)
{
    if (a.Equals(b))
    {
        result = a.ToString();
        textBox1.Text = result;
        textBox1.TextAlign = HorizontalAlignment.Left;
    }
    else
    {
        result = b.ToString();
        textBox1.Text = result;
        textBox1.TextAlign = HorizontalAlignment.Center;
    }
}

将大括号放在if，else语句，loops等中始终是一种好习惯。

阅读此问题的答案：Why is it considered a bad practice to omit curly braces?