private void HighLightingText(HTMLDocument document, IHTMLDOMNode node, string keyword, int cnt)
{
// nodeType = 3：text节点
if (node.nodeType == 3)
{
string nodeText = node.nodeValue.ToString();
// 如果找到了关键字
if (nodeText.Contains(keyword))
{
IHTMLDOMNode parentNode = node.parentNode;
// 将关键字作为分隔符，将文本分离，并逐个添加到原text节点的父节点
string[] result = nodeText.Split(new string[] { keyword }, StringSplitOptions.None);
for (int i = 0; i < result.Length - 1; i++)
{
if (result[i] != "")
{
IHTMLDOMNode txtNode = document.createTextNode(option[cnt] + result[i] + option[cnt]);
parentNode.insertBefore(txtNode, node);
}
IHTMLDOMNode orgNode = document.createTextNode(option[cnt] + keyword + option[cnt]);
IHTMLDOMNode hilightedNode = (IHTMLDOMNode)document.createElement("SPAN");
IHTMLStyle style = ((IHTMLElement)hilightedNode).style;
style.color = "black";
style.backgroundColor = color[cnt];
hilightedNode.appendChild(orgNode);
parentNode.insertBefore(hilightedNode, node);
}
if (result[result.Length - 1] != "")
{
IHTMLDOMNode postNode = document.createTextNode(option[cnt] + result[result.Length - 1] + option[cnt]);
parentNode.insertBefore(postNode, node);
}
parentNode.removeChild(node);
} // End of nodeText.Contains(keyword)
}
else
{
// 如果不是text节点，则递归搜索其子节点
IHTMLDOMChildrenCollection childNodes = node.childNodes as IHTMLDOMChildrenCollection;
foreach (IHTMLDOMNode n in childNodes)
{
HighLightingText(document, n, keyword, cnt);
}
}
}
