Question

我想为一系列事件创建自定义Eventargs。我正在使用第三方X / Y范围，我在其中绘制强度与频率。该范围有能力放置标记＆＃34;在它上面只是各种频率的小三角形。这些标记支持事件，例如当鼠标进入标记时，执行单击，并且鼠标离开标记。所以对于两个标记，这里是代码：

        private void createEvents()
        {
            this.scope2.MarkerGroups[0].Click += new EventHandler(Marker0_Click);
            this.scope2.MarkerGroups[0].MouseEnter += new EventHandler(Marker0_Enter);
            this.scope2.MarkerGroups[0].MouseLeave += new EventHandler(Marker0_Leave);

            this.scope2.MarkerGroups[1].Click += new EventHandler(Marker1_Click);
            this.scope2.MarkerGroups[1].MouseEnter += new EventHandler(Marker1_Enter);
            this.scope2.MarkerGroups[1].MouseLeave += new EventHandler(Marker1_Leave);
        }
        // And now the event handlers

        private void Marker0_Click(object sender, EventArgs e)
        {
            //do something;           
        }

        private void Marker0_Enter(object sender, EventArgs e)
        {
              //do something          
        }

        private void Marker0_Leave(object sender, EventArgs e)
        {
            // do something
        }

        private void Marker1_Click(object sender, EventArgs e)
        {
            //do something;           
        }

        private void Marker1_Enter(object sender, EventArgs e)      
        {
              //do something          
        }

        private void Marker1_Leave(object sender, EventArgs e)
        {
            // do something
        }

现在这适用于两个标记......但我需要80个标记。我可以把整个事情写出去，但必须有更好的方法。所以我开始是这样的：

    private void createMarkerEvents()
    {
        for (int i = 0; i < 80; i++)
        {
            this.scope2.MarkerGroups[i].Click += new EventHandler(Marker_Click);
            this.scope2.MarkerGroups[i].MouseEnter += new EventHandler(Marker_Enter);
            this.scope2.MarkerGroups[i].MouseLeave += new EventHandler(Marker_Leave);
        }
     }

        private void Marker_Click(object sender, EventArgs e)
        {
            //do something;           
        }

        private void Marker_Enter(object sender, EventArgs e)
        {
              //do something          
        }

        private void Marker_Leave(object sender, EventArgs e)
        {
            // do something
        }

所以问题是如何将事件中的实际标记号传递给事件处理程序？必须要有办法。谢谢，汤姆

Answer 1

如果您想识别标记组，可以将object sender投射到MarkerGroup对象

private void AnyMarker_Click(object sender, EventArgs e)
{
    MarkerGroup group = (MarkerGroup)sender;
    int indexOfMarkerGroup = this.scope2.MarkerGroups.IndexOf(group);
    //do something;           
}

关闭：您应该定义一个自定义的EventArgs类：

public class MyEventArgs : EventArgs
{
    public int MyCustomProperty {get;set;}
}

然后在您的活动中使用它：

public event EventHandler<MyEventArgs> ButtonPressed;

使用自定义参数的火灾事件：

if(ButtonPressed != null)
{
    ButtonPressed(this, new MyEventArgs { MyCustomProperty = 1 });
}

修改完整的例子：

private void createMarkerEvents() { for (int i = 0; i < 80; i++) { this.scope2.MarkerGroups[i].Click += new EventHandler(Marker_Click); this.scope2.MarkerGroups[i].MouseEnter += new EventHandler(Marker_Enter); this.scope2.MarkerGroups[i].MouseLeave += new EventHandler(Marker_Leave); } } private void Marker_Click(object sender, EventArgs e) { // When markergroup fires and event, it passes reference to itself as `sender` parameter // so we can get access it MarkerGroup mg = (MarkerGroup)sender; // this marker has fired a click event // Now you know which marker has fired event // if you want to determine it's index in MarkerGroups collection: int index = this.scope2.MarkerGroup.IndexOf(mg); // now you know MarkerGroup and it's index } private void Marker_Enter(object sender, EventArgs e) { //do something } private void Marker_Leave(object sender, EventArgs e) { // do something }

如何为事件定义自定义事件标记？

1 个答案: