圆形应用程序中的背景颜色不改变

Question

我正在我编写的一个简单的背景颜色更改程序中使用视觉控件和颜色。我还想合并圆形应用程序窗口，这是通过创建一个被黑色包围的实心圆的位图并使黑色透明来实现的。现在我的背景色不再循环。谁能告诉我如何解决这个问题。我将包含我的代码以防万一它有帮助，但我认为这是一个表单属性问题。感谢您的帮助！

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();      
    }

    public Point mouse_offset;
    public int c;

    private void button1_Click(object sender, EventArgs e)
    {
        using (SpeechSynthesizer synth = new System.Speech.Synthesis.SpeechSynthesizer())
        {
            synth.Speak("This is a test of the emergency see sharp broadcasting network!");
            synth.Speak("The man to the left is actually trying to dance without graphics capabilities");

        }
        while (Visible)
        {
            using (SpeechSynthesizer synth = new System.Speech.Synthesis.SpeechSynthesizer())
            {
                synth.Speak("Flash dance commencing in three. two. one.");
            }
            while (Visible)
            {
                for (int c = 0; c < 255 && Visible; c++)
                {
                    this.BackColor = Color.FromArgb(c, 255 - c, c);
                    Application.DoEvents();
                    //slow();

                }


                for (int c = 255; c > 0 && Visible; c--)
                {
                    this.BackColor = Color.FromArgb(c, 255 - c, c);
                    Application.DoEvents();
                    //slow();

                }

            }
        }
    }

    public static void slow()
    {
        System.Threading.Thread.Sleep(3);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        mouse_offset = new Point(-e.X, -e.Y);

    }

    private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left) 
        {
            Point mousePos = Control.MousePosition;
             mousePos.Offset(mouse_offset.X, mouse_offset.Y);
            Location = mousePos;
        }
    }


}

}

Answer 1

每次您更改组件的外观并想要显示此更改时，请调用

myComponent.Invalidate();

这会强制组件重新绘制自身。现在您已经了解了，有多种方法可以优化重绘，但我认为上述内容应该可以帮助您入门。