在C#中打开一个没有焦点的表单

using System.Windows.Forms;

public class MyForm : Form
{
    protected override void OnShown(EventArgs e)
    {
        base.OnShown(e);
        this.TopMost = true;
    }
}

class Program
{
    static void Main()
    {
        Application.Run(new MyForm());
    }
}