Generate_Cnblogs_Articles_To_Markdown_Files.CnblogsHelper.GetArticleCategory C# (CSharp) Method

        private static string GetArticleCategory(string appName, int blogId, int postId)
        {
            var strReturn = string.Empty;
            var apiReturn =
                NetworkHelper.GetHtmlFromGet(string.Format("http://www.cnblogs.com/mvc/blog/CategoriesTags.aspx?blogApp={0}&blogId={1}&postId={2}", appName, blogId, postId), Encoding.UTF8);
            var content = StringHelper.ConvertUnicode(apiReturn); //注意parry的参数需要替换，其实blogid不要获取，是固定的。
            var regexCategory = new Regex(@".*?category.*?>(\d+\.)?(?<cata>.*?)</a>",
                RegexOptions.Singleline | RegexOptions.Multiline);
            var regexTag = new Regex(".*?tag.*?>(?<cata>.*?)</a>", RegexOptions.Singleline | RegexOptions.Multiline);
            var matches = regexCategory.Matches(content);
            var stringBuilder = new StringBuilder();
            foreach (Match match in matches)
            {
                var catName = match.Groups["cata"].ToString();
                if (catName == "Sugars") //一些分类的替换，可根据需要修改
                {
                    catName = "开发技巧";
                }
                stringBuilder.AppendFormat("\r\n- {0}", catName);
            }
            if (matches.Count > 0)
            {
                strReturn = "categories:" + stringBuilder;
            }

            var stringBuilderTags = new StringBuilder();
            var matchesTag = regexTag.Matches(content);
            foreach (Match match in matchesTag)
            {
                var catName = match.Groups["cata"].ToString();
                stringBuilderTags.AppendFormat("\r\n- {0}", catName);
            }
            if (!string.IsNullOrEmpty(strReturn))
            {
                strReturn += "\r\n";
            }
            if (matchesTag.Count > 0)
            {
                strReturn += "tags:" + stringBuilderTags + "\r\n- 我的博客园文章"; //导入的文章添加了默认的 tag，可去除。
            }
            return strReturn;
        }