HtmlHelper and RouteValueDictionary Methods

Question

When writing the htmlhelper extension, if I want to support similarly structured ctors for my htmlhelper extension method, I use the RouteValueDictionaryfollowing:

public static string ListBoxDict(this HtmlHelper htmlHelper, 
                                 string name, 
                                 object value, 
                                 object htmlAttributes)
{
    return ListBoxDict(htmlHelper, 
                       name, 
                       value, 
                       ((IDictionary<string, object>)
                           new RouteValueDictionary(htmlAttributes)));
}

My question really is why I need it RouteValueDictionary... I know you can't just drop it htmlAttributesuntil IDictionary<string, object>... although I'm not sure why it could be where I'm confused. Shouldn't it RouteValueDictionarybe routing, and therefore has nothing to do with the HtmlHelper methods? As I said, I probably skipped this point, so I would be glad if someone could tell me what I missed.

Greeting...

edit: in response to Dan's answer →

I just watched what I saw in the mvc source code for input helpers ...

• . "src\SystemWebMvc\Mvc\Html\InputExtensions.cs"

:

public static string TextBox(this HtmlHelper htmlHelper, 
                             string name, 
                             object value, 
                             object htmlAttributes)
{
    return TextBox(htmlHelper, 
                   name, 
                   value,
                   new RouteValueDictionary(htmlAttributes))
}

, , ?

Answer 1

.

:

Codedump:

public static string ToAttributeList(this object list)
{
  StringBuilder sb = new StringBuilder();
  if (list != null)
  {
    Hashtable attributeHash = GetPropertyHash(list);
    string resultFormat = "{0}=\"{1}\" ";
    foreach (string attribute in attributeHash.Keys)
    {
      sb.AppendFormat(resultFormat, attribute.Replace("_", ""), 
          attributeHash[attribute]);
    }
  }
  return sb.ToString();
}

public static string ToAttributeList(this object list,
                                     params object[] ignoreList)
{
  Hashtable attributeHash = GetPropertyHash(list);

  string resultFormat = "{0}=\"{1}\" ";
  StringBuilder sb = new StringBuilder();
  foreach (string attribute in attributeHash.Keys)
  {
    if (!ignoreList.Contains(attribute))
    {
      sb.AppendFormat(resultFormat, attribute, 
          attributeHash[attribute]);
    }
  }
  return sb.ToString();
}

public static Hashtable GetPropertyHash(object properties)
{
  Hashtable values = null;

  if (properties != null)
  {
    values = new Hashtable();
    PropertyDescriptorCollection props = 
        TypeDescriptor.GetProperties(properties);

    foreach (PropertyDescriptor prop in props)
    {
      values.Add(prop.Name, prop.GetValue(properties));
    }
  }
  return values;
}

:

public static string ListBoxDict(this HtmlHelper htmlHelper, 
                                 string name, 
                                 object value, 
                                 object htmlAttributes)
{
    return htmlHelper.ListBoxDict(name,
                                  value,
                                  htmlAttributes.ToAttributeList()));
}

.ToAttributeList() , htmlAttribute

name = "value"

, .