按下按钮时如何创建任意数量的对象实例 c# winforms

Question

在我的代码中，每次按下 button1 时，面板中都会生成一个名为 NOT 的图片框实例。当图像被单击并按住时，可以四处拖动。我的问题是每次按下按钮 1 时，我都希望创建另一个具有相同属性的图片框，这样理论上我可以整天按下按钮 1 并根据需要拖动尽可能多的非图片框对象。到目前为止，一旦按下按钮，只会创建一个 NOT 实例，而无法生成另一个实例。所以基本上如何在每次按下 button1 时创建 NOT 的新唯一实例。

public Form1()

    {

        InitializeComponent();

        Drag();

    }

    private void button1_Click(object sender, EventArgs e)

    {

        spawnGate("not");

    }

    PictureBox NOT = new PictureBox();

    private Point startPoint = new Point();

    public void Drag()

    {

        NOT.MouseDown += (ss, ee) =>

        {

            if (ee.Button == System.Windows.Forms.MouseButtons.Left)

            {

                startPoint = Control.MousePosition;

            }

        };

        NOT.MouseMove += (ss, ee) =>

        {

            if (ee.Button == System.Windows.Forms.MouseButtons.Left)

            {

                Point temp = Control.MousePosition;

                Point res = new Point(startPoint.X - temp.X, startPoint.Y - temp.Y);

                NOT.Location = new Point(NOT.Location.X - res.X, NOT.Location.Y - res.Y);

                startPoint = temp;

            }

        };

    }

    public void spawnGate(string type)

    {

        switch (type)

        {

            case "not":

                NOT.Width = 100;

                NOT.Height = 50;

                NOT.Image = Properties.Resources.Not_gate;

                NOT.SizeMode = PictureBoxSizeMode.Zoom;

                workspace.Controls.Add(NOT);

            break;

        }

    }

}

Answer 1

更改NOT为List<PictureBox>.然后，在方法中添加一个new PictureBox实例。请注意，需要更改以获取参数。NOTspawnGate()Drag()PictureBox编辑：根据评论中的要求，为了访问此问题的其他人的利益，这里正是需要更改代码才能获得 OP 请求的行为的方法。请注意，此设计可以而且应该在几个方面进行重构。List<PictureBox> NOT = new List<PictureBox>();Point startPoint = new Point();public Form1(){&nbsp; &nbsp; InitializeComponent();&nbsp; &nbsp; Drag();}private void button1_Click(object sender, EventArgs e){&nbsp; &nbsp; spawnGate();}public void spawnGate(){&nbsp; &nbsp; var pictureBox = new PictureBox()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; Width = 100,&nbsp; &nbsp; &nbsp; &nbsp; Height = 50,&nbsp; &nbsp; &nbsp; &nbsp; Image = Properties.Resources.Not_gate,&nbsp; &nbsp; &nbsp; &nbsp; SizeMode = PictureBoxSizeMode.Zoom&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; }&nbsp; &nbsp; Drag(pictureBox);&nbsp; &nbsp; NOT.Add(pictureBox);&nbsp; &nbsp; workspace.Controls.Add(pictureBox);}public void Drag(PictureBox pictureBox){&nbsp; &nbsp; pictureBox.MouseDown += (ss, ee) =>&nbsp;&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; if (ee.Button == System.Windows.Forms.MouseButtons.Left)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startPoint = Control.MousePosition;&nbsp; &nbsp; };&nbsp; &nbsp; pictureBox.MouseMove += (ss, ee) =>&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; if (ee.Button == System.Windows.Forms.MouseButtons.Left)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Point temp = Control.MousePosition;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Point res = new Point(startPoint.X - temp.X, startPoint.Y - temp.Y);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pictureBox.Location = new Point(pictureBox.Location.X - pictureBox.X, pictureBox.Location.Y - res.Y);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startPoint = temp;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; };}

Answer 2

您不必直接在表单上保存指向 NOT 的指针（或者，如果您以后需要调用它们，可以将它们保存到列表中）。public Form1(){&nbsp; &nbsp; InitializeComponent();}private void button1_Click(object sender, EventArgs e){&nbsp; &nbsp; spawnGate("not");}// This list is optional, if you easily want to find them laterList<PictureBox> allNOTs = new List<PictureBox>();public void spawnGate(string type){&nbsp; &nbsp; switch (type)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; case "not":&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PictureBox NOT = new PictureBox();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NOT.Width = 100;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NOT.Height = 50;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NOT.Image = Properties.Resources.Not_gate;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NOT.SizeMode = PictureBoxSizeMode.Zoom;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NOT.MouseDown += (ss, ee) =>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Mouse down event code here&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NOT.MouseMove += (ss, ee) =>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Mouse move event code here&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; allNOTS.Add(NOT); // Optional if you easily want to find it later&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; workspace.Controls.Add(NOT);&nbsp; &nbsp; &nbsp; &nbsp; break;&nbsp; &nbsp; }}}