是否可以将一个表单放在另一个表单之上，而不是在TopMost之上?

问题描述

我想做的事情很简单:将WinForm放在另一个之上，而不是最顶层.就像，当我单击一个窗口时，我的winform会在它的顶部，但是当我单击其他东西(例如浏览器)时，我的窗体将不在它的顶部.

What I'm trying to do is simple: make my WinForm on top of another, but not topmost.Like, when I click on a window, my winform will be on top of it, but when I click on something else, like a browser, my form will not be on top of it.

类似于TopMost WinForm，但仅适用于特定过程.(我正在为游戏制作叠加层，所以我需要它在游戏中位于最高位置.)

Like a TopMost WinForm, but only for a specific process.(Im making a overlay for a game, so I need it to be topmost ONLY on the game.)

有帮助的图片(红色边框内的所有内容都是我的形式):

Pictures to help (Everything inside the RED border is my form):

然后，当我切换到另一个窗口(在本例中为Explorer)时，我希望表单位于背景中，就像《英雄联盟》客户端

And then when I change to another window (In this case, Explorer) I want my form to be in the background, just like the League of Legends client

推荐答案

所拥有的表单始终显示在其所有者表单的顶部.要使表单归所有者所有，可以将所有者表单的引用分配给拥有表单的 Onwer 属性，例如:

Owned forms are always displayed on top of their owner form. To make a form owned by an owner, you can assign a reference of the owner form to Onwer property of the owned form, for example:

var f = new Form();
f.Owner = this;
f.Show();

将另一个进程的窗口设置为所有者

为此，您应该首先找到另一个进程的窗口句柄，然后使用 SetWindowLong API函数，您可以将其设置为以下内容的所有者您的表格，例如:

To do so, you should first find the handle of window of the other process, then using SetWindowLong API function, you can set it as owner of your form, for example:

//using System.Runtime.InteropServices;
//using System.Diagnostics;

[DllImport("user32.dll", EntryPoint = "SetWindowLong", CharSet = CharSet.Auto)]
public static extern IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
private void button1_Click(object sender, EventArgs e)
{
    var notepad = Process.GetProcessesByName("notepad").FirstOrDefault();
    if(notepad!=null)
    {
        var owner = notepad.MainWindowHandle;
        var owned = this.Handle;
        var i = SetWindowLong(owned, -8 /*GWL_HWNDPARENT*/, owner);
    }
}

在上面的示例中，您的表单将始终位于记事本窗口的顶部.

In above example, your form will be always on top of the notepad window.

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