c# - 在其他所有内容后面显示一个表单，而不窃取焦点？

Question

StackOverflow 上存在一个关于如何在不转移焦点的情况下显示表单的问题。答案是覆盖 ShowWithoutActivation 并返回 true:

protected override bool ShowWithoutActivation
{
  get { return true; }
}

这很好用。

现在我想更进一步。我想要显示一个表单(即使其可见)，但让它在 z 顺序中落后于其他表单。

在 .net 中可能吗？

如果不行，可以使用 P/Invoke 吗？

奖金聊天

调用 SendToBack() 无效:

   RunnerForm frm = new RunnerForm();
// frm.Show();
   frm.Visible = true;
   frm.SendToBack();

Answer 1

一点 PInvoke 使用 SetWindowPos function

public static class HWND {
  public static readonly IntPtr
  NOTOPMOST = new IntPtr(-2),
  BROADCAST = new IntPtr(0xffff),
  TOPMOST = new IntPtr(-1),
  TOP = new IntPtr(0),
  BOTTOM = new IntPtr(1);
}

public static class SWP {
  public static readonly int
  NOSIZE = 0x0001,
  NOMOVE = 0x0002,
  NOZORDER = 0x0004,
  NOREDRAW = 0x0008,
  NOACTIVATE = 0x0010,
  DRAWFRAME = 0x0020,
  FRAMECHANGED = 0x0020,
  SHOWWINDOW = 0x0040,
  HIDEWINDOW = 0x0080,
  NOCOPYBITS = 0x0100,
  NOOWNERZORDER = 0x0200,
  NOREPOSITION = 0x0200,
  NOSENDCHANGING = 0x0400,
  DEFERERASE = 0x2000,
  ASYNCWINDOWPOS = 0x4000;
}

[DllImport("user32.dll")]
public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags);

private void button1_Click(object sender, EventArgs e) {
  RunnerForm frm = new RunnerForm();
  SetWindowPos(frm.Handle, HWND.BOTTOM, 0, 0, 0, 0, SWP.SHOWWINDOW | SWP.NOMOVE | SWP.NOOWNERZORDER | SWP.NOSIZE | SWP.NOACTIVATE);
}