What does GenericType<(param1, param2...)> means

Question

I have been on that link but there are some lines I really don't understand.

1) List<()>

    private readonly List<(string MemberName, Func<T, object> Fingerprint)> _fingerprints;

2) For < Tproperty>

    public FingerprintBuilder<T> For<TProperty>(Expression<Func<T, TProperty>> memberExpression, Expression<Func<TProperty, TProperty>> fingerprint

How are they called? Can you provide some good links/explanations about them?

C# named tuple https://learn.microsoft.com/en-us/dotnet/csharp/tuples — Pavel Anikhouski, Nov 26 '19 at 11:16
Does this answer your question? [Better naming in Tuple classes than "Item1", "Item2"](https://stackoverflow.com/questions/7745938/better-naming-in-tuple-classes-than-item1-item2) — Tanveer Badar, Nov 26 '19 at 11:26
It looks like the link is dictionary [or List] where the key is a string and the value is an object. Your item 1 is a List>. Your item 2 is enumerating through the values item 1. — jdweng, Nov 26 '19 at 11:28
Questions about tutorial or documentation are off-topic here. — MakePeaceGreatAgain, Nov 26 '19 at 11:38
@TanveerBadar Not really. However, I finally got what that basically means. — Nick King, Nov 26 '19 at 12:12

score 2 · Answer 1 · edited Nov 26 '19 at 12:54

2

When you see Func<T, TProperty> that is a delegate fingerprint, last item under <> is output, all others inputs.

So

Func<string, string, int> Fcn

Is a function that accepts 2 string parameters and returns integer value.

Lets define a function that accepts 2 strings and returns sum of their lengths

        Func<string, string, int> Fcn = (string s1, string s2) => s1.Length + s2.Length;

        var result = Fcn.Invoke("test", "test2");
        Console.WriteLine(result); // will return 9

In your case, it is just some generic types, but functionally it is the same like this example

edited Nov 26 '19 at 12:54

Madushan

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answered Nov 26 '19 at 11:23

Djuro

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This explains generic delegates. The question is about something else entirely. – Tanveer Badar Nov 26 '19 at 11:27
Not entirely, but this answers the question only partially. OP seems to fail the entire basics behind generics, delegates are just one way to use generics. – MakePeaceGreatAgain Nov 26 '19 at 11:28
@Djuro Thanks for the explanation concerning **Func<>** but what about the **For**? Can you? – Nick King Nov 26 '19 at 12:19

What does GenericType<(param1, param2...)> means

1 Answers1