Initializing fields through attribute?

I want the value to be initialized according to the attribute When Instance is created.

class FieldAttr : Attribute
{
    public readonly string key;
    public Key_FieldAttr(string key)
    {
        this.key = key;
    }
}

class CtorAttr : Attribute
{
}

static string FromTable(string key)
{
    // will return localized string of key from table.
}

...

class LocalizedMetadata
{
    [FieldAttr("NAME")]
    public string Name { get; }

    [FieldAttr("DESC")]
    public readonly string Description;
    
    [CtorAttr]
    public LocalizedMetadata(string header)
    {
        // I want "Key" attribute to do as below...
        // this.Name = FromTable(header + "NAME");
        // this.Description = FromTable(header + "DESC");
    }
}


        
public static void Main(string[] args)
{
    var foo = new LocalizedMetadata("UNITY_");
    Console.WriteLine(foo.Name);        // = FromTable("UNITY_NAME");
    Console.WriteLine(foo.Description); // = FromTable("UNITY_DESC");
}

I don't know where to attach what kind of Attribute (Field, Construction, Class) will be possible. I looked up documents about Attribute and Reflection, but I don't know if this is possible.

I think below solution will solve your problem.

class LocalizedMetadata
    {
        [FieldAttr("NAME")]
        public string Name { get; set; }

        [FieldAttr("DESC")]
        public string Description { get; set; }

        public LocalizedMetadata(string header)
        {
            foreach (var property in typeof(LocalizedMetadata).GetProperties())
            {
                foreach (var attr in property.GetCustomAttributes(false))
                {
                    FieldAttr fieldAttr = (FieldAttr)attr;

                    property.SetValue(this, header + fieldAttr.Key);
                }
            }
        }
    }

public static void Main(string[] args)
{
    var foo = new LocalizedMetadata("UNITY_");
    Console.WriteLine(foo.Name);
    Console.WriteLine(foo.Description);
}

Output:

UNITY_NAME
UNITY_DESC