如何检查XML中是否存在特定属性? [英] How do I check particular attributes exist or not in XML?

问题描述

部分XML内容:

<section name="Header">
  <placeholder name="HeaderPane"></placeholder>
</section>

<section name="Middle" split="20">
  <placeholder name="ContentLeft" ></placeholder>
  <placeholder name="ContentMiddle"></placeholder>
  <placeholder name="ContentRight"></placeholder>
</section>

<section name="Bottom">
  <placeholder name="BottomPane"></placeholder>
</section>

我要检入每个节点，如果属性 split 存在，请尝试在变量中分配属性值.

I want to check in each node and if attribute split exist, try to assign an attribute value in a variable.

在循环中，我尝试:

foreach (XmlNode xNode in nodeListName)
{
    if(xNode.ParentNode.Attributes["split"].Value != "")
    {
        parentSplit = xNode.ParentNode.Attributes["split"].Value;
    }
}

但是如果条件只检查值而不检查属性是否存在，那我是错的.我应该如何检查属性的存在?

But I'm wrong if the condition checks only the value, not the existence of attributes. How should I check for the existence of attributes?

推荐答案

您实际上可以直接索引到Attributes集合中(如果使用的是C#而不是VB):

You can actually index directly into the Attributes collection (if you are using C# not VB):

foreach (XmlNode xNode in nodeListName)
{
  XmlNode parent = xNode.ParentNode;
  if (parent.Attributes != null
     && parent.Attributes["split"] != null)
  {
     parentSplit = parent.Attributes["split"].Value;
  }
}

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