private static string GetNodeText(HtmlNode htmlNode, string attributeName, HtmlAnalysisAttributeEnum attributeEnum)
{
if (htmlNode == null)
{
return(null);
}
if (attributeEnum == HtmlAnalysisAttributeEnum.Text)
{
return(htmlNode.InnerText);
}
if (attributeEnum == HtmlAnalysisAttributeEnum.Html)
{
return(htmlNode.InnerHtml);
}
if (htmlNode.Attributes[attributeName] == null)
{
return(null);
}
return(htmlNode.Attributes[attributeName].Value);
}
/// <summary>
/// 获取内容
/// </summary>
/// <typeparam name="T">基类类型，例：string</typeparam>
/// <param name="htmlDocument">HtmlDocument</param>
/// <param name="xPath">XPath 查询语句</param>
/// <param name="attributeName">属性名称</param>
/// <param name="attributeEnum">属性枚举</param>
/// <returns></returns>
public static T ToT <T>(HtmlDocument htmlDocument, string xPath, string attributeName, HtmlAnalysisAttributeEnum attributeEnum = HtmlAnalysisAttributeEnum.Attribute)
{
T t = default(T);
HtmlNode documentNode = htmlDocument.DocumentNode;
if (documentNode == null)
{
return(t);
}
HtmlNode htmlNode = documentNode.SelectSingleNode(xPath);
if (htmlNode == null)
{
return(t);
}
string attributeValue = GetNodeText(htmlNode, attributeName, attributeEnum);
if (string.IsNullOrEmpty(attributeValue))
{
return(t);
}
t = (T)Convert.ChangeType(attributeValue, typeof(T));
return(t);
}
/// <summary>
/// 实体属性映射 Attribute 名称
/// </summary>
/// <param name="name">属性所对应的 Attribute 名称</param>
/// <param name="nameType">属性枚举</param>
public HtmlAnalysisTAttribute(string name, HtmlAnalysisAttributeEnum nameType = HtmlAnalysisAttributeEnum.Attribute)
{
this.name = name;
this.nameType = nameType;
}
/// <summary>
/// 返回基础类型数据列表
/// </summary>
/// <typeparam name="T">基类类型，例：string</typeparam>
/// <param name="htmlDocument">HtmlDocument</param>
/// <param name="xPath">XPath 查询语句</param>
/// <param name="attributeName">属性名称</param>
/// <param name="attributeEnum">属性枚举</param>
/// <returns></returns>
public static List <T> ToList <T>(HtmlDocument htmlDocument, string xPath, string attributeName, HtmlAnalysisAttributeEnum attributeEnum = HtmlAnalysisAttributeEnum.Attribute)
{
HtmlNode documentNode = htmlDocument.DocumentNode;
if (documentNode == null)
{
return(null);
}
List <T> dataList = new List <T>();
HtmlNodeCollection htmlNodeCollection = documentNode.SelectNodes(xPath);
if (htmlNodeCollection == null || htmlNodeCollection.Count == 0)
{
return(null);
}
foreach (HtmlNode htmlNode in htmlNodeCollection)
{
string attributeValue = GetNodeText(htmlNode, attributeName, attributeEnum);
if (!string.IsNullOrEmpty(attributeValue))
{
dataList.Add((T)Convert.ChangeType(attributeValue, typeof(T)));
}
}
return(dataList);
}
