實現窗體的最大最小關閉效果

        public static string ImaDir = "";//存儲圖片的路徑

        #region  獲取圖片路徑
        /// <summary>
        /// 獲取圖片路徑
        /// </summary>
        public void ImageDir()
        {
            string Tem_Imadir = "";
            Tem_Imadir = UpAndDown_Dir(System.AppDomain.CurrentDomain.BaseDirectory);
            Tem_Imadir = UpAndDown_Dir(Tem_Imadir);
            Tem_Imadir = UpAndDown_Dir(Tem_Imadir);
            ImaDir = Tem_Imadir;
        }
        #endregion

 

#region  返回上一級目錄
        /// <summary>
        /// 返回上一級目錄
        /// </summary>
        /// <param dir="string">目錄</param>
        /// <returns>返回String對象</returns>
        public string UpAndDown_Dir(string dir)
        {
            string Change_dir = "";
            Change_dir = Directory.GetParent(dir).FullName;
            return Change_dir;
        }
        #endregion

 

private void Image_Min_Click(object sender, EventArgs e)
        {
            if (this.WindowState != FormWindowState.Minimized)
                this.WindowState = FormWindowState.Minimized;
        }

        private void Image_Max_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
                this.WindowState = FormWindowState.Maximized;
            else
            {
                if (this.WindowState == FormWindowState.Maximized)
                    this.WindowState = FormWindowState.Normal;
            }
           
        }

        private void Image_Close_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Image_Min_MouseEnter(object sender, EventArgs e)
        {
            switch (Convert.ToInt32(((PictureBox)sender).Tag.ToString()))
            {
                case 1:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//最小化變色.jpg");
                        break;
                    }
                case 2:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//最大化變色.jpg");
                        break;
                    }
                case 3:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//關閉變色.jpg");
                        break;
                    }
                case 4:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//發送按鈕變色.png");
                        break;
                    }
            }
        }

        private void Image_Min_MouseLeave(object sender, EventArgs e)
        {
            switch (Convert.ToInt32(((PictureBox)sender).Tag.ToString()))
            {
                case 1:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//最小化按鈕.jpg");
                        break;
                    }
                case 2:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//最大化按鈕.jpg");
                        break;
                    }
                case 3:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//關閉按鈕.jpg");
                        break;
                    }
                case 4:
                    {
                        ((PictureBox)sender).Image = null;
                        ((PictureBox)sender).Image = Image.FromFile(Form1.ImaDir + "//Image//發送按鈕.png");
                        break;
                    }
            }
        }

 

 

 

        private void Form1_Load(object sender, EventArgs e)
        {
            this.ImageDir();
        }