c# - 你能控制 TagBuilder 类呈现属性的顺序吗？

Question

我知道这有点强制症，但是有没有一种方法可以控制 TagBuilder 类在您调用 ToString() 时呈现 HTML 标记属性的顺序>?

即这样

var tb = new TagBuilder("meta");            
tb.Attributes.Add("http-equiv", "Content-Type");            
tb.Attributes.Add("content", "text/html; charset=utf-8");    
tb.ToString(TagRenderMode.SelfClosing)

会回来

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

不是

<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />

更改添加属性的顺序不会改变它，它似乎是按字母顺序呈现的

Answer 1

尝试使用此类，它继承了 TagBuilder 并覆盖了 ToString 方法，从属性构建 SortedDictionary 并使用该字典进行渲染。

    public class MyTagBuilder : TagBuilder
    {
        //required to inherit from TagBuilder
        public MyTagBuilder(string tagName) : base(tagName){}

        //new hides the original ToString(TagRenderMode renderMode) 
        //The only changes in this method is that all calls to GetAttributesString
        //have been changed to GetMyAttributesString 
        public new string ToString(TagRenderMode renderMode)
        {
            switch (renderMode)
            {
                case TagRenderMode.StartTag:
                    return string.Format(CultureInfo.InvariantCulture, "<{0}{1}>", new object[] { this.TagName, this.GetMyAttributesString() });

                case TagRenderMode.EndTag:
                    return string.Format(CultureInfo.InvariantCulture, "</{0}>", new object[] { this.TagName });

                case TagRenderMode.SelfClosing:
                    return string.Format(CultureInfo.InvariantCulture, "<{0}{1} />", new object[] { this.TagName, this.GetMyAttributesString() });
            }
            return string.Format(CultureInfo.InvariantCulture, "<{0}{1}>{2}</{0}>", new object[] { this.TagName, this.GetMyAttributesString(), this.InnerHtml });
        }

        //Implement GetMyAttributesString where the Attributes are changed to a SortedDictionary
        private string GetMyAttributesString()
        {
            var builder = new StringBuilder();
            var myDictionary = new SortedDictionary<string, string>();     //new
            foreach (KeyValuePair<string, string> pair in this.Attributes) //new
            {                                                              //new
                myDictionary.Add(pair.Key, pair.Value);                    //new
            }                                                              //new 
            //foreach (KeyValuePair<string, string> pair in this.Attributes)
            foreach (KeyValuePair<string, string> pair in myDictionary)    //changed
            {
                string key = pair.Key;
                if (!string.Equals(key, "id", StringComparison.Ordinal) || !string.IsNullOrEmpty(pair.Value))
                {
                    string str2 = HttpUtility.HtmlAttributeEncode(pair.Value);
                    builder.AppendFormat(CultureInfo.InvariantCulture, " {0}=\"{1}\"", new object[] { key, str2 });
                }
            }
            return builder.ToString();
        }
    }