Question

我试图将代码形式一个按钮放入一个类中，但在测试过程中我注意到我的表单上的面板没有更新。将面板直接设置为按钮时，它可以正常工作（参见buttons2的代码）。

button1代码......

private void button1_Click(object sender, EventArgs e)
        {
          SpecialPanelBuilder spb = new SpecialPanelBuilder();
          panel1 = spb.PopulatedPanel();

        }

特别小组班......

public class SpecialPanelBuilder
    {
        public Panel PopulatedPanel()
        {
            Panel p = new Panel();
            Graphics g;

            int size = 30;
            int TextLeft = size;
            //int LeftStartBox = 


            g = p.CreateGraphics();

            g.FillRectangle(Brushes.Red, 10, 10, size, size);
            g.DrawRectangle(new Pen(Color.Black), 10, 10, size, size);
            g.DrawString(("test"), new Font("Arial", size /2, FontStyle.Bold),
            Brushes.Black,
            (size + TextLeft),
            (size) - (-2));

            g.FillRectangle(Brushes.Orange, 300, 10, size, size);
            g.DrawRectangle(new Pen(Color.Black), 300, 10, size, size);
            g.DrawString(("test"), new Font("Arial", size / 2, FontStyle.Bold),
            Brushes.Black,
            (size + TextLeft + 300),
            (size) - (-2));

            g.FillRectangle(Brushes.Green, 600, 10, size, size);
            g.DrawRectangle(new Pen(Color.Black), 600, 10, size, size);
            g.DrawString(("test"), new Font("Arial", size/2, FontStyle.Bold),
            Brushes.Black,
            (size + TextLeft + 600),
            (size) - (-2));

            return p;
    }

按钮2代码，其中包含来自该类的所有代码...

private void button2_Click(object sender, EventArgs e)
        {



            int size = 30;
            int TextLeft = size;
            //int LeftStartBox = 

            Graphics g;
            g = panel1.CreateGraphics();

            g.FillRectangle(Brushes.Red, 10, 10, size, size);
            g.DrawRectangle(new Pen(Color.Black), 10, 10, size, size);
            g.DrawString(("Below Threshold"), new Font("Arial", size / 2, FontStyle.Bold),
            Brushes.Black,
            (size + TextLeft),
            (size) - (-2));

            g.FillRectangle(Brushes.Orange, 300, 10, size, size);
            g.DrawRectangle(new Pen(Color.Black), 300, 10, size, size);
            g.DrawString(("Less than 20% above threshold"), new Font("Arial", size / 2, FontStyle.Bold),
            Brushes.Black,
            (size + TextLeft + 300),
            (size) - (-2));

            g.FillRectangle(Brushes.Green, 600, 10, size, size);
            g.DrawRectangle(new Pen(Color.Black), 600, 10, size, size);
            g.DrawString(("On Order"), new Font("Arial", size / 2, FontStyle.Bold),
            Brushes.Black,
            (size + TextLeft + 600),
            (size) - (-2));

        }

Answer 1

好吧，我不确定是对的但是在按钮2中你的图形对象g是用panel1.CreateGraphics（）设置的，而button1.Code则不是这样。所以你实际上正在使用内部面板变量的图形对象。

我的代码在粘贴到按钮时起作用，但不是从类中起作用

1 个答案: