c# - 如何禁用C#中的最小化按钮？

Question

在我的应用程序中，我需要暂时使主窗体的最小化按钮变灰。有什么想法可以实现吗？我不介意对 Win32 dll 执行 p/调用。

编辑:将最小化按钮灰显是首选解决方案，但是还有其他方法可以防止表单最小化吗？

Answer 1

我阅读了您对我的回复的评论，并能够为您制定更完整的解决方案。我跑得很快，它似乎有你想要的行为。不要从 Form 派生 winforms，而是从这个类派生:

using System;
using System.Windows.Forms;
using System.ComponentModel;

namespace NoMinimizeTest
{
    public class MinimizeControlForm : Form
    {
        private const int WM_SYSCOMMAND = 0x0112;
        private const int SC_MINIMIZE = 0xf020;

        protected MinimizeControlForm()
        {
            AllowMinimize = true;
        }

        protected override void WndProc(ref Message m)
        {
            if (!AllowMinimize)
            {
                if (m.Msg == WM_SYSCOMMAND)
                {
                    if (m.WParam.ToInt32() == SC_MINIMIZE)
                    {
                        m.Result = IntPtr.Zero;
                        return;
                    }
                }
            }
            base.WndProc(ref m);
        }

        [Browsable(true)]
        [Category("Behavior")]
        [Description("Specifies whether to allow the window to minimize when the minimize button and command are enabled.")]
        [DefaultValue(true)]
        public bool AllowMinimize
        {
            get;
            set;
        }
    }
}

如果您希望能够在发送点击时决定是否允许最小化，您可以做更多的事情，例如:

using System;
using System.Windows.Forms;
using System.ComponentModel;

namespace NoMinimizeTest
{
    public class MinimizeControlForm : Form
    {
        private const int WM_SYSCOMMAND = 0x0112;
        private const int SC_MINIMIZE = 0xf020;

        protected MinimizeControlForm()
        {

        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_SYSCOMMAND)
            {
                if (m.WParam.ToInt32() == SC_MINIMIZE && !CheckMinimizingAllowed())
                {
                    m.Result = IntPtr.Zero;
                    return;
                }
            }
            base.WndProc(ref m);
        }

        private bool CheckMinimizingAllowed()
        {
            CancelEventArgs args = new CancelEventArgs(false);
            OnMinimizing(args);
            return !args.Cancel;
        }

        [Browsable(true)]
        [Category("Behavior")]
        [Description("Allows a listener to prevent a window from being minimized.")]
        public event CancelEventHandler Minimizing;

        protected virtual void OnMinimizing(CancelEventArgs e)
        {
            if (Minimizing != null)
                Minimizing(this, e);
        }
    }
}

有关此窗口通知的更多信息，请参阅 MSDN article about it .