程序启动时文本框处于焦点状态

Question

如何在程序启动时将我的文本框 "Fahrenheit" 设置为焦点，而不必手动单击它？因为程序只有1个功能，会比较舒服

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

    private void label2_Click(object sender, EventArgs e)
    {
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
      this.ActiveControl = textBox1;

      double Fahrenheit = Convert.ToDouble(textBox1.Text);
      double Celsius = (Fahrenheit - 32) * 5.0 / 9.0;

      textBox2.Text = Celsius.ToString("F");
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }
  }
}

Answer 1

行 this.ActiveControl = textBox1; 应该在 InitializeComponent(); 下方，像这样：

public Form1()
{
  InitializeComponent();
  this.ActiveControl = textBox1;
}

程序启动时文本框处于焦点状态

Text box in focus when program starts

c#

textbox

focus