如何在c#中使用继承从另一个类调用对象
本文关键字:另一个 调用 对象 继承 | 更新日期: 2023-09-27 18:03:54
我试图从另一个对象上的MouseHover事件调用按钮的可见性。我要做的是,当我把鼠标放在一个pictureBox上,设置附着在那个pictureBox上的按钮是可见的,默认情况下,按钮被创建时是不可见的。当我尝试从MouseHover事件调用它时,它说按钮为空。我不太擅长继承,所以我被困在这里,任何帮助都会很感激。下面是代码(我要做的只是在MouseHover事件上):
private void Button1_Click(object sender, EventArgs e)
{
FlowLayoutPanel flP = new FlowLayoutPanel();
PictureBox picB = new PictureBox();
Label laB = new Label();
Button btn = new Button();
picB.Size = new Size(130, 70);
laB.Size = new Size(130, 20);
flP.Size = new Size(130, 90);
btn.Size = new Size(20, 20);
laB.Text = "Text";
laB.Name = "Name";
flP.Name = "Name";
btn.Text = "X";
btn.Name = "Name";
btn.Visible = false;
flP.Controls.Add(picB);
flP.Controls.Add(laB);
picB.Controls.Add(btn);
flP.Location = new System.Drawing.Point(3, 3);
laB.Location = new System.Drawing.Point(3, 70);
btn.Location = new System.Drawing.Point(100, 5);
mainFLP.Controls.Add(flP);
picB.MouseHover += picB_MouseHover;
picB.DoubleClick += picB_DoubleClick;
}
private void picB_MouseHover(object sender, EventArgs e)
{
PictureBox pb = (PictureBox)sender;
Button bt = pb.Parent as Button;
//bt.Visible = true;
}
private void Form1_Load(object sender, EventArgs e)
{
for (int i = 1; i <= 10; i++)
{
FlowLayoutPanel flP = new FlowLayoutPanel();
PictureBox picB = new PictureBox();
Label laB = new Label();
Button btn = new Button();
picB.Size = new Size(130, 70);
laB.Size = new Size(130, 20);
flP.Size = new Size(130, 90);
btn.Size = new Size(20, 20);
flP.Name = i.ToString();
laB.Name = "Link";
laB.Text = "Name";
btn.Text = "X";
btn.Name = "b" + i.ToString();
btn.Visible = false;
flP.Controls.Add(picB);
flP.Controls.Add(laB);
picB.Controls.Add(btn);
flP.Location = new System.Drawing.Point(3, 3);
laB.Location = new System.Drawing.Point(3, 70);
btn.Location = new System.Drawing.Point(100, 5);
mainFLP.Controls.Add(flP);
picB.MouseHover += picB_MouseHover;
picB.DoubleClick += picB_DoubleClick;
}
}
private void picB_DoubleClick(object sender, EventArgs e)
{
PictureBox pb = (PictureBox)sender;
FlowLayoutPanel flp = pb.Parent as FlowLayoutPanel;
flp.Dispose();
}
一种方法是将Button变量存储在图片框的tag属性中:
PictureBox picB = new PictureBox();
Button btn = new Button();
picB.Tag = btn;
及以后,在鼠标悬停处理程序
中private void picB_MouseHover(object sender, EventArgs e)
{
PictureBox pb = (PictureBox)sender;
Button bt = pb.Tag as Button;
//bt.Visible = true;
}
为空,因为事件的发送者是图片,而不是按钮。您可以简单地在类级别声明按钮
private Button btn;
private void Button1_Click(object sender, EventArgs e)
{
FlowLayoutPanel flP = new FlowLayoutPanel();
PictureBox picB = new PictureBox();
Label laB = new Label();
btn = new Button();
,然后直接使其可见
private void picB_MouseHover(object sender, EventArgs e)
{
bt.Visible = true;
}
编辑
或者您可以定义一个Dictionary来将找到的PictureBox与相应的Button关联起来
private var btnDict = new Dictionary<PictureBox,Button>();
,当你创建它们时,你也可以链接它们,
PictureBox picB = new PictureBox();
Label laB = new Label();
Button btn = new Button();
btnDict.Add(picB,btn);
以便您可以使用像
这样的命令检索按钮PictureBox pb = (PictureBox)sender;
var btn = btnDict[pb];