Question

首先我添加了许多属性，但这不是传递变量的正确方法。我该怎么处理呢？

其次，此控件将像pictureBox1 esigner（或任何其他表单设计器）中的form1 d一样使用。在form1中，我使用了pictureBox1的一些事件。现在我需要在控件中使用picturebox1的事件，所以我是否需要创建和使用控制代码中的所有事件而不是form1？

这是用户控制代码：

namespace Find_Distance
{
    public partial class pictureBox1Control : UserControl
    {

        public static PictureBox pb1;
        // blinking colors: yellow, red, yellow, transparent, repeat...
        public static Brush[] cloudColors = new[] { Brushes.Yellow, Brushes.Transparent };
        // current color index
        public static int cloudColorIndex = 0;

        public pictureBox1Control()
        {
            InitializeComponent();

            pb1 = new PictureBox();
            this.pictureBox1 = pb1;
            SetStyle(
            ControlStyles.AllPaintingInWmPaint |

            ControlStyles.OptimizedDoubleBuffer |
            ControlStyles.UserPaint |
            ControlStyles.ResizeRedraw, true);
        }

        private void pictureBox1Control_Load(object sender, EventArgs e)
        {

        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
            e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            e.Graphics.SmoothingMode = SmoothingMode.HighQuality;

            e.Graphics.Clear(Color.White);
            e.Graphics.DrawImage(pictureBox1Control.pb1.Image, movingPoint);
            CloudEnteringAlert.Paint(e.Graphics, currentfactor, _distance);

            float distance = _kilometers / (float)1.09;//289617486; // One pixel distance is 1.09 kilometer.
            Pen p;
            p = new Pen(Brushes.Green);
            if (_points == null)
            {
                return;
            }
            foreach (Point pt in _pointsint)
            {
                e.Graphics.FillEllipse(Brushes.Red, pt.X * (float)currentfactor, pt.Y * (float)currentfactor, 2f, 2f);
            }
            foreach (PointF pt in _movingpoints)
            {
                if (_Cloud == null)
                {
                    e.Graphics.FillEllipse(Brushes.Red, (pt.X - distance) * (float)currentfactor, pt.Y * (float)currentfactor, 2f, 2f);
                }
            }
            foreach (PointF pt in _pointtocolor)
            {
                e.Graphics.FillEllipse(Brushes.Yellow, pt.X * (float)currentfactor, pt.Y * (float)currentfactor, 2f, 2f);
            }
            if (_Cloud != null)
            {
                foreach (PointF pt in _Cloud)
                {
                    e.Graphics.FillEllipse(cloudColors[cloudColorIndex], pt.X * (float)currentfactor, pt.Y * (float)currentfactor, 2f, 2f);
                }
            }
            else
            {
                return;
            }

            foreach (var cloud in _clouds)
            {
                e.Graphics.FillEllipse(
                   cloud.Brush, cloud.Center.X, cloud.Center.Y,
                   cloud.Diameter, cloud.Diameter);
            }
        }

        public static List<Ellipse> _clouds = new List<Ellipse>();
        public List<Ellipse> Clouds
        {
            get { return _clouds; }
        }

        public static List<PointF> _points = new List<PointF>();
        public List<PointF> Points
        {
            get { return _points; }
        }

        public static List<Point> _pointsint = new List<Point>();
        public List<Point> PointsInt
        {
            get { return _pointsint; }
        }

        public static List<PointF> _movingpoints = new List<PointF>();
        public List<PointF> MovingPoints
        {
            get { return _movingpoints; }
        }

        public static List<PointF> _pointtocolor = new List<PointF>();
        public List<PointF> PointtoColor
        {
            get { return _pointtocolor; }
        }

        public static List<PointF> _Cloud = new List<PointF>();
        public List<PointF> Cloud
        {
            get { return _Cloud; }
        }

        public static float _kilometers;
        public float Kilometers
        {
            get { return _kilometers; }
        }

        public static float _distance;
        public float Distance
        {
            get { return _distance; }
        }

        public static Point movingPoint;
        public static double currentfactor;
        public static float distance;
    }
}

在这个用户控件设计器上，我添加了一个pictureBox1。

这就是我在Form1中使用它的方式：

pictureBox1Control.pb1.Image = test.jpg;

但它不会在控件中的pictureBox1上显示图像。

Answer 1

而不是使用：

pictureBox1Control.pb1.Image = test.jpg;

尝试使用

pictureBox1Control.pb1.Load(@"c:\test.jpg");

当然，请确保该文件存在。此外，您应该从此行中删除“静态”：

 public static PictureBox pb1;

如果您打开了10个窗口，则可能不希望显示所有相同的图像。我看到你的PictureBox对象没有添加到控件中。在第一种方法中，在创建PictureBox之后，使用

this.Controls.Add(pb1)

如何使用pictureBox1创建用户控件，以便以后可以在任何项目中使用它？

1 个答案: