winform中,自定义控件,添加了一个集合属性,为其添加成员,没有立即刷新,什么问题?

Question

由于要求MyRect要是只读属性,不能执行invalidate,即使我将它改成非只读属性,并在set{}中添加invalidate方法,它也并不执行.大家帮帮忙

Answer 1

 public void Add(myRect rect)
            {
                List.Add(rect);
                //试试在这里进行重绘
            }
            

Answer 2

不行,那里没有办法调用invalidate,但是我在add和remove下添加了事件,但似乎只有初始化控件的时候触发了事件,其他时候都没有触发.

Answer 3

感觉你的处理逻辑存在问题。不是没有触发，是没给它响应的时间。
invalidate 之后调用 update试试。或者直接调用refresh试试。
this.invalidate();
this.update();
或者
this.refresh();

Answer 4

这样不能解决问题,我在design time状态下要及时刷新,而不是run time下

Answer 5

对,但是什么时候响应呢?应该是添加了新的项,或者是删除了项,又或者更改了项的属性值是进行刷新,那么我要对myRect添加事件,当集合里面的内容有变化时,进行invalidate.但是如何为myRect添加事件,我不太清楚

Answer 6

try:        public partial class Userconrol : Control
        {
            public Userconrol()
            {
                myRect.MyRectChanged += myRect_MyRectChanged;
            }            void myRect_MyRectChanged(object sender, EventArgs e)
            {
                Invalidate();
            }            private MyRectCollectin myRect = new MyRectCollectin();            public class MyRectCollectin : CollectionBase
            {
                public event EventHandler MyRectChanged;                public myRect this[int index]
                {
                    get
                    {
                        return (myRect)List[index];
                    }
                }
                public void Add(myRect rect)
                {
                    List.Add(rect);
                    if (MyRectChanged != null)
                        MyRectChanged(rect, null);
                }
                public void Remove(int index)
                {
                    if (index > Count - 1 || index < 0)
                    {
                        MessageBox.Show("Index not valid!");
                    }
                    else
                    {
                        List.RemoveAt(index);
                        if (MyRectChanged != null)
                            MyRectChanged(index, null);
                    }
                }
            }
        }

Answer 7

试过了,仍然没有立即刷新,添加集合中新的项时,在add处添加断点,似乎并没有走进去.因此没有触发这个事件,但是集合中的count确实增加了1.

Answer 8

public class MyCircle 
    {
        private Point position;
        private int radius;
        public Point Position
        {
            get
            {
                return position;
            }
            set
            {
                position = value;
            }
        }
        public int Radius
        {
            get
            {
                return radius;
            }
            set
            {
                radius = value;
            }
        }
    }
    public partial class MyButton : Control
    {
  public MyCircleCollection m_MyCircle = new MyCircleCollection();
     public MyButton()
        {
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
            m_MyCircle.ItemChanged += OnItemChanged;
        }
        public void OnItemChanged(object sender,EventArgs e)
        {
            this.Invalidate();
        }
        public class MyCircleCollection : CollectionBase
        {   
            public event EventHandler ItemChanged;            public MyCircle this[int index]
            {
                get
                {
                    return (MyCircle)List[index];
                }
            }
            public void Add(MyCircle circle)
            {
                List.Add(circle);
                ItemChanged(this, null);
            }
            public void Remove(int index)
            {
                if (index > Count - 1 || index < 0)
                {
                    MessageBox.Show("Index not valid!");
                }
                else
                {
                    List.RemoveAt(index);
                }
                ItemChanged(this, null);
            }
           
        }
  protected override void OnPaint(PaintEventArgs e)
        {
if (MyCircle.Count != 0)
            {
                foreach (MyCircle c in MyCircle)
                {
                    e.Graphics.DrawEllipse(Pens.Black, c.Position.X, c.Position.Y, c.Radius, c.Radius);//Draw circle
                }
            }
        }
}
大致是这样,就是在一个自定义控件上画圆圈,其实和你的代码差不多.但是不起效果.

Answer 9

请问如何判断委托事件有没有被执行?比如在design time下我添加了一个圆圈吧,然后run一下,itemchanged事件这时被调用了,圆圈也在控件上画出来了,但是如果我在propertygrid中再添加一个圆圈在集合里,那么第二个圆圈没有被画上去,但是把鼠标移到控件内,那个圆圈就出来了.因为我在mouseenter中进行了重绘.

Answer 10

测试了一下，没有问题：    public class MyCircle
    {
        private Point position;
        private int radius;
        public Point Position
        {
            get
            {
                return position;
            }
            set
            {
                position = value;
            }
        }
        public int Radius
        {
            get
            {
                return radius;
            }
            set
            {
                radius = value;
            }
        }
    }
    public partial class MyButton : Control
    {
        public MyCircleCollection m_MyCircle = new MyCircleCollection();
        public MyButton()
        {
            //这句得去掉this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
            m_MyCircle.ItemChanged += OnItemChanged;
        }
        public void OnItemChanged(object sender, EventArgs e)
        {
            this.Invalidate();
        }
        public class MyCircleCollection : CollectionBase
        {
            public event EventHandler ItemChanged;            public MyCircle this[int index]
            {
                get
                {
                    return (MyCircle)List[index];
                }
            }
            public void Add(MyCircle circle)
            {
                List.Add(circle);
                ItemChanged(this, null);
            }
            public void Remove(int index)
            {
                if (index > Count - 1 || index < 0)
                {
                    MessageBox.Show("Index not valid!");
                }
                else
                {
                    List.RemoveAt(index);
                }
                ItemChanged(this, null);
            }        }
        protected override void OnPaint(PaintEventArgs e)
        {
            if (m_MyCircle.Count != 0)
            {
                foreach (MyCircle c in m_MyCircle)
                {
                    e.Graphics.DrawEllipse(Pens.Black, c.Position.X, c.Position.Y, c.Radius, c.Radius);//Draw circle
                }
            }
        }
    }调用：    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();            this.Load += Form3_Load;
        }        void Form3_Load(object sender, EventArgs e)
        {
            MyButton btn = new MyButton();
            btn.Name = "myBtn";
            btn.Width = this.Width;
            btn.Height = this.Height;
            btn.Location = new Point(5, 5);
            this.Controls.Add(btn);        }        private void button1_Click(object sender, EventArgs e)
        {
            MyButton btn = this.Controls["myBtn"] as MyButton;
            Random r = new Random();
            btn.m_MyCircle.Add(new MyCircle { Position = new Point(r.Next(0, this.Width / 2), r.Next(this.Height / 2)), Radius = 10 });
        }
    }

Answer 11

您这样用代码去添加的确没问题,要直接在属性栏上更改,就像更改其他控件一样.点击MyCircle属性,会跳出一个dialog,然后添加半径圆心.点击ok,关闭dialog,这时应该添加的圆已经画在控件上了,但是实际却没有.代码也的确生成了.就是没有重绘.

Answer 12

这个我解决不了……
您接着等大神吧，
good luck