从 xmlNodeList 中删除节点

Question

这是我的代码

    public bool limitOutput()
    {
        double lowerLeftPointX = m_mapControl.CurrentExtent.LowerLeftPoint.X;
        double lowerLeftPointY = m_mapControl.CurrentExtent.LowerLeftPoint.Y;
        double upperRightPointX = m_mapControl.CurrentExtent.UpperRightPoint.X;
        double upperRightPointY = m_mapControl.CurrentExtent.UpperRightPoint.Y;

        for(int i = locationElements.Count - 1; i >= 0; i--)
        {
            if (Double.Parse(locationElements[i]["GEOMETRY_X"].InnerText) < lowerLeftPointX || Double.Parse(locationElements[i]["GEOMETRY_X"].InnerText) > upperRightPointX || Double.Parse(locationElements[i]["GEOMETRY_Y"].InnerText) < lowerLeftPointY || Double.Parse(locationElements[i]["GEOMETRY_Y"].InnerText) > upperRightPointY)
            {
                locationElements[i].ParentNode.RemoveChild(locationElements[i]);
            }
        }

        if (locationElements.Count == 0)
        {
            PearMessageBox.Show(PearMessageBox.mBoxType.simpleNotification, "No results found in specified area");
            return false;
        }
        return true;


    }

我正在尝试删除所有不在我设置的边界内的节点。执行了删除行，但实际上并没有删除，因为当我计算 locationElements 时，它仍然是执行该方法之前的相同值。

知道代码有什么问题吗

Answer 1

问题是由于 RemoveChild() 从源 XmlDocument 中删除了元素，而不是从预填充的 XmlNodeList 中删除了元素。因此，您需要再次执行用于预填充 locationElements 变量的代码，如下所示：

//assume that GetLocationElements() is a method...
//...containing the same logic you used to populate locationElements variable
var updatedLocationElements = GetLocationElements();
if (updatedLocationElements.Count == 0)
{
    PearMessageBox.Show(PearMessageBox.mBoxType.simpleNotification, "No results found in specified area");
    return false;
}
return true;

从 xmlNodeList 中删除节点

Deleting a node from an xmlNodeList

c#

xml

for-loop

removechild

parent-node