无法将自定义控件点击事件发送到主机表单 [英] Cant ripple a custom control click event up to the host form

问题描述

我正在使用两个AForge PictureBox和一个ListBox创建一个自定义控件（称为视口）。这三个控件填充UserControl。



我希望主机表单上的事件处理程序响应鼠标单击任何视口（每个网络摄像头1个）在计算机上，最多六个）在运行时添加到主机表单。



我已经阅读了几天的论坛，并尝试了不同的方式结束。我得到的最接近的如下所示。我在vpClick对象上得到一个null对象异常。

I am creating a custom control (called a viewport) with two AForge PictureBox’s and one ListBox. The three controls fill the UserControl.

I want an event handler on the host form to respond to a mouse click on any of the viewports (1 per each web cam attached to the computer, up to six) added to the host form at runtime.

I have been reading forums for several days and tried no end of different ways. The closest I have got is shown below. I get a null object exception on the vpClick object.

vpClick(103, this.Name);

我尝试了什么：



在自定义控件中

What I have tried:

In the Custom Control

<pre>using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace FlowerControls
{
    // Add delegate for all control click events
    public delegate void VPClick(int Code, string Title);

    public partial class ViewPort: UserControl
    {
        // Define event from delegate
        public event VPClick vpClick;

:::::

:::::

<pre>        private void PictureFlower_Click(object sender, EventArgs e)
        {
            vpClick(101, this.Name);
        }

        private void ListBoxViews_SelectedIndexChanged(object sender, EventArgs e)
        {
            vpClick(102, this.Name);
        }

        private void KeyIcon_Click(object sender, EventArgs e)
        {
            vpClick(103, this.Name);
        }

在房东形式

In The host form

// Declare a delegate
public delegate void ViewPort_click(object sender, MouseEventArgs e);

::::

::::

FlowerControls.ViewPort VP01;
int a = 1;
while (a < 7)
{
    VP01 = new FlowerControls.ViewPort();
    //VP01.ContextMenuStrip = contextMenuStripViewPort;
    VP01.Height = viewPortHeight;
    VP01.Width = viewPortHeight;



    //VP01.SizeMode = PictureBoxSizeMode.Zoom;
    VP01.BloomPhoto = Properties.Resources.testpattern; VP01.BorderStyle = BorderStyle.FixedSingle;

    VP01.Location = new Point(I * viewPortHeight, 0);
    I += 1;
    viewports.Add(a, VP01);
    splitContainer2.Panel1.Controls.Add(viewports[a]);

    //viewports[a].Click += new ViewPort_click(object sender, MouseEventArgs e);
    a++;
}

::::

::::

public void ViewPort_click(object sender, MouseEventArgs e)
{
    //do stuff here
    MessageBox.Show("Click");
}

public void vpClick(int Code, string Name) { MessageBox.Show(Name); }

推荐答案

请看这里：在两种形式之间传递信息，第2部分：儿童到父母 [ ^ ] - 它显示了如何将事件传递到父表单但是它与UserControl的代码完全相同（部分原因是Form派生自Control）。

See here: Transferring information between two forms, Part 2: Child to Parent[^] - it shows how to pass an event up to a "parent form" but it's exactly the same code for a UserControl (partly because a Form is derived from Control).

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