如何正确存储位置答案

【问题标题】：How to store locations properly如何正确存储位置
【发布时间】：2021-07-25 10:22:48
【问题描述】：

我有这个表单，它允许用户通过单击并拖动鼠标来创建图片框。每次添加图片框或将图片框移动到新位置时，如何存储图片框所在位置的坐标（位置）？我正在尝试将它们作为字符串存储在列表中以供导出。

private void Form_MouseClick(object sender, MouseEventArgs e)
{
    // create new control
    PictureBox pictureBox = new PictureBox();
    pictureBox.Location = new Point(e.X, e.Y);
    pictureBox.BackColor = Color.Red;
    this.Controls.Add(pictureBox);
    // bind event for each PictureBox
    pictureBox.MouseDown += pictureBox_MouseDown;
    pictureBox.MouseUp += pictureBox_MouseUp;
    pictureBox.MouseMove += pictureBox_MouseMove;
}


Point mouseDownPoint = Point.Empty;
Rectangle rect = Rectangle.Empty;
bool isDrag = false;

private void pictureBox_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        mouseDownPoint = e.Location;
        rect = (sender as PictureBox).Bounds;
    }
}

private void pictureBox_MouseUp(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        if (isDrag)
        {
            isDrag = false;
            (sender as PictureBox).Location = rect.Location;
            this.Refresh();
        }
        reset();
    }
}

private void pictureBox_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        isDrag = true;
        rect.Location = this.PointToClient((sender as PictureBox).PointToScreen(new Point(e.Location.X - mouseDownPoint.X, e.Location.Y - mouseDownPoint.Y)));
        this.Refresh();
    }
}

private void reset()
{
    mouseDownPoint = Point.Empty;
    rect = Rectangle.Empty;
    isDrag = false;
}

【问题讨论】：

标签： c# visual-studio picturebox windows-forms-designer

【解决方案1】：

要保存每个图片框的位置，可以定义一个字典来保存键值对。

首先，将字典box_location_Pairs定义为全局变量。

然后在“点击创建新图片框”时将新项目添加到字典中。

Dictionary<PictureBox, Point> box_location_Pairs = new Dictionary<PictureBox, Point>();

// ...

private void Form_MouseClick(object sender, MouseEventArgs e)
{
    PictureBox pictureBox = new PictureBox();
    pictureBox.Location = new Point(e.X, e.Y);
    box_location_Pairs.Add(pictureBox, pictureBox.Location);
    // ...
}

如果图片框被移动，修改它的值。

private void pictureBox_MouseUp(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        if (isDrag)
        {
            isDrag = false;
            (sender as PictureBox).Location = rect.Location;
            box_location_Pairs[sender as PictureBox] = rect.Location; // modifty key-value pair
            this.Refresh();
        }
        reset();
    }
}

【讨论】：

太棒了。干杯！