如何将表格设置为最高

Question

我正在尝试做的只是将其上有一个图片框的位置设置为我计算机上最上面的对象，并保持这种状态。 我尝试使用f.topmost = true; 但是，如果我单击某些内容，则我的表单不再是最重要的。 我正在从dll运行我的表单（下面是dll的代码）。 我还尝试过在表单上添加加载内容，这也没有执行任何操作。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace pic
{
public class Class1
{
    [DllImport("user32.dll", SetLastError = true)]
    private static extern UInt32 GetWindowLong(IntPtr hWnd, int nIndex);
    [DllImport("user32.dll")]
    static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
    [DllImport("user32.dll")]
    static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
    public const int GWL_EXSTYLE = -20;
    public const int WS_EX_LAYERED = 0x80000;
    public const int WS_EX_TRANSPARENT = 0x20;
    public const int LWA_ALPHA = 0x2;
    public const int LWA_COLORKEY = 0x1;
    Form f = new Form();

    public void t(int LocalX, int LocalY, string PicLocal, byte transparency)
    {
        f.Load += new EventHandler(ProgramViwer_Load);
        Bitmap bitmap;
       // Form f = new Form();
        f.BackColor = Color.White;
        f.FormBorderStyle = FormBorderStyle.None;
        f.Bounds = Screen.PrimaryScreen.Bounds;

        bitmap = new Bitmap(PicLocal);
        f.Size = new Size(bitmap.Size.Width, bitmap.Size.Height);
        f.StartPosition = FormStartPosition.Manual;
        f.SetDesktopLocation(LocalX, LocalY);

        Application.EnableVisualStyles();



        PictureBox PictureBox1 = new PictureBox();

        PictureBox1.Location = new System.Drawing.Point(0, 0);
        PictureBox1.Image = bitmap;

        PictureBox1.Size = new System.Drawing.Size(bitmap.Size.Width, bitmap.Size.Height);

        PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;

        f.Controls.Add(PictureBox1);

        f.AllowTransparency = true;
        SetWindowLong(f.Handle, GWL_EXSTYLE,
        (IntPtr)(GetWindowLong(f.Handle, GWL_EXSTYLE) | WS_EX_LAYERED | WS_EX_TRANSPARENT));
        // set transparency to 50% (128)
        SetLayeredWindowAttributes(f.Handle, 0, transparency, LWA_ALPHA);

        Color BackColor = Color.White;
        f.TransparencyKey = BackColor;
        f.Opacity = transparency / 255f;

        Application.Run(f);

    }

    private void ProgramViwer_Load(object sender, EventArgs e)
    {
        f.TopMost = true;
    }

}
}

Answer 1

您的问题是其他窗口也将其“ TopMost”属性设置为true。 这不是最干净的解决方案，但它应该可以工作。

new Thread(() =>
                {
                    try
                    {
                        while (true)
                        {
                            this.TopMost = true;
                            Thread.Sleep(1);
                        }
                    }
                    catch (Exception ex) { }
                }).Start();