如何访问正则表达式组的 .Name？

Question

I have a regex that is like this:

var a = new Regex("(?<PageNumber>.{2})(?<ListType>.{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);

Match:

a.Match("02KLThisIsATest");

When I then after a successfull match use:

foreach (Group gr in match.Groups)
{
...
}

I can see clearly in the debugger that the "Name" is filled out and thus "0", "Page'Number", "ListType". BUT I cannot in the source use: gr.Name. The compiler just says "no there is no Name".

Now my question is: How can I access the Name?

Answer 1

try this

  var a = new Regex("(?<PageNumber>.{2})(?<ListType>.{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);

  GroupCollection groups = a.Match("02KLThisIsATest").Groups;
  var names = a.GetGroupNames();

foreach (var grpName in names )
  {
      Console.WriteLine("Group: {0}, Value: {1}", grpName, groups[grpName].Value);
  }

Answer 2

It works as expected when I am running on .Net runtime > 4.6.2. Some properties are not accessible because of boxing\\ unboxing of an object to an underlying abstract or base type so that extra members in inherited or child class are hidden. I made it to dynamic to expose all public\\ protected members.

Related: Why some properties/fields are being visible in debugger, but not accessible from the code?

public static void Main(string[] args)
{
    var a = new Regex("(?<PageNumber>.{2})(?<ListType>.{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Multiline);
    var match = a.Match("02KLThisIsATest");

    foreach (dynamic gr in match.Groups)
    {
        //Your code goes here
        Console.WriteLine(gr.Name + " | " + gr.Value);
    }
}

Published the example in, https://rextester.com/FKYG47557