c# – 悬停事件错误触发

出于某种原因,当我将鼠标悬停在我的c#表单应用程序中的按钮上时,它会导致我的代码重置.考虑到我实际上按钮上没有任何悬停事件,这对我来说似乎很奇怪.我甚至尝试添加另一个按钮,即使我什么都不做,悬停仍会导致重置.

该程序应该用颜色填充油箱,颜色可以在填充时更改.一旦填满,它将重置为空.它应该在下一次滑块控制填充速度与之交互时开始填充.

它正确执行此操作但当我将鼠标悬停在按钮上时它也会再次开始填充.

namespace Assignment5A
{
    public partial class MainForm : Form
    {
        public float streamHeight = 370;
        public float lastWaterHeight = 0;
        public float waterHeight = 0;
        public float waterBottom = 500;
        public float fillSpeed = 300;

        public Color brushColor = Color.LightBlue;
        public Graphics g;
        public Pen pen;
        public Brush brush = new SolidBrush(Color.LightBlue);

        public MainForm()
        {
            InitializeComponent();
            this.Width = 500;
            this.Height =600;
            this.BackColor = Color.Black;
            SpeedTimer.Interval = (int)fillSpeed;
        }

        private void MainForm_Paint(object sender,PaintEventArgs e)
        {
            g = e.Graphics;
            pen = new Pen(Color.White);
            g.DrawLine(pen,50,200,500);
            g.DrawLine(pen,350,500,500);

            SpeedTimer.Start();
        }

        private void SpeedTimer_Tick(object sender,EventArgs e)
        {
            if (waterHeight < 270)
            {
                brush = new SolidBrush(brushColor);
                g = this.CreateGraphics();

                g.FillRectangle(brush,108,136,20,waterBottom - 136 - waterHeight);
                waterHeight += 1f;
                g.FillRectangle(brush,51,waterBottom - waterHeight,299,waterHeight - lastWaterHeight);
                lastWaterHeight = waterHeight;
            }
            else
            {
                SpeedTimer.Stop();
                waterHeight = 0;
                lastWaterHeight = 0;
                brush = new SolidBrush(Color.Black);
                g.FillRectangle(brush,364);
            }
        }

        private void Speed_Scroll(object sender,EventArgs e)
        {
            if (waterHeight < 270)
            {
                float scrollValue = Speed.Value;
                fillSpeed = 300 / scrollValue;
                SpeedTimer.Interval = (int)fillSpeed;
            }
            else
            {
                brush = new SolidBrush(Color.Black);
                g.FillRectangle(brush,230,270);
                SpeedTimer.Start();
            }
        }

        private void ColorButton_Click(object sender,EventArgs e)
        {
            SetColor.ShowDialog();
            brushColor = SetColor.Color;
        }
    }
}