How to get the custom attribute of a const string contained in struct in static class-CodePudding

I search a solution to get the custom attribute of a const string by the value of this const string. Like this example :

public static class Directory
{
    public struct Bank01
    {
        [SymbolAttribute("Attribute01")]
        public const string Value01 = "Bank01.Value01";
        [SymbolAttribute("Attribute02")]
        public const string Value02 = "Bank01.Value02";
    }
    public struct Bank02
    {
        [SymbolAttribute("Attribute03")]
        public const string Value01 = "Bank02.Value01";
        [SymbolAttribute("Attribute04")]
        public const string Value02 = "Bank02.Value02";
    }


    public static SymbolAttribute GetSymbolAttribute(string value)
    {
        return typeof(Directory)
            .GetMember(value.Split('.')[0])
            .GetType()
            .GetField(value.Split('.')[1])
            .GetCustomAttribute<SymbolAttribute>();
    }
}

I want use this function like this :

public static Main()
    {
        SymbolAttribute attribute = GetSymbolAttribute(Directory.Bank01.Value01);
    }

I don't understand why this one work :

return typeof(Directory.Bank01)
            .GetField(value.Split('.')[1])
            .GetCustomAttribute<SymbolAttribute>();

And this one doesn't work :

return typeof(Directory)
            .GetMember(value.Split('.')[0])
            .GetType()
            .GetField(value.Split('.')[1])
            .GetCustomAttribute<SymbolAttribute>();

Do you have an idea ? Thank you in advance ..

CodePudding user response：

Bank01 and Bank02 are not members, they are nested classes, so you should use GetNestedType instead.

typeof(Directory)
    .GetNestedType(value.Split('.')[0])
    .GetField(value.Split('.')[1])
    .GetCustomAttribute<SymbolAttribute>();