Question

所以我有两个组成部分。第一个是代表节点的Image。然后为父图像的每个角落另外4个图像，它们代表占位符。

public class Node : Image 
{
    public int ID { get; set; }
    public int Type { get; set; }
    public List<NodePlaceholder> PlaceholderList = new List<NodePlaceholder>();

    //creating Node Image, Creating 4 instances of NodePlaceholder for each corner and adding them to PlaceholderList

    TargetCanvas.Children.Add(this);
    foreach (var placeholder in PlaceholderList)
    {
         TargetCanvas.Children.Add(placeholder);
    }
 }


public class NodePlaceholder : Image
{
     this.MouseLeftButtonDown += NodePlaceholder_MouseLeftButtonDown;
}

void NodePlaceholder_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    //how to get Parent Node ID?
}

您能否告诉我如何获取父ID？

我通过传递创建内部属性来表示父ID并将其传递给NodePlaceholders构造函数来完成此操作，但这会创建冗余（5个不同属性中的相同值）。我确定有更优雅的方式这样做。

Answer 1

您应该将成员对象添加到NodePlaceholder类以指回＆＃34; Parent＆＃34;，然后确保分配它，例如：

foreach (var placeholder in PlaceholderList)
{
     TargetCanvas.Children.Add(placeholder);
     placeholder.Parent = this; //or this.ID, or whatever you need to access...
}

从复合对象访问父级

1 个答案: