Find class method by value

Question

How to make a search method for a class object that finds a property that contains the searched value?

I now the class property has string value - "Anna", but I need to know what property holds it.

Tell if need more information.

class Program 
{
    public static void Main(string[] args)
    {
        First first = new First()
        {
            Name = "Anna",
            Nick = "Alise"
        };

        string find = "Anna";

        string some = first.Equals_SomeMethodWith(find);// How to do this?
      Console.WriteLine(some);
    }
        
}

class First
{
    public string Name { get; set; }

    public string Nick { get; set; }
}

Answer 1

Assuming you mean properties, not methods, then something like:

var props = first.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
foreach (var prop in props)
{
    if (prop.PropertyType == typeof(string))
    {
        try
        {
            if (prop.GetValue(first) is string val && val == find)
            {
                Console.WriteLine($"{prop.Name}={val}");
            }
        }
        catch { } // best efforts
    }
}

---

Or for an array (comments):

First[] objects = new[] {
    new First()
    {
        Name = "Fred",
        Nick = "Freddy"
    },
    new First()
    {
        Name = "Anna",
        Nick = "Alise"
    },
    new First()
    {
        Name = "Robert",
        Nick = "Bob"
    },
};

string find = "Anna";
var index = Array.FindIndex(objects, x => AnyPropEquals(x, find));
Console.WriteLine(index);


static bool AnyPropEquals<T>(object obj, T value)
{
    var props = obj.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
    foreach (var prop in props)
    {
        if (prop.PropertyType == typeof(T))
        {
            try
            {
                if (prop.GetValue(obj) is T val && EqualityComparer<T>.Default.Equals(val, value))
                    return true;
            }
            catch { } // best efforts
        }
    }
    return false;
}