delegate-params-reflection.cs

using System;
using System.Linq;
using static System.Reflection.BindingFlags;

Type t = typeof(D);
t.GetMethods(Public | Instance).Where(m => m.Name is "Invoke").ToArray().Inspect("method");
t.GetMethod("Invoke")!.GetParameters().Inspect("parameters");

delegate void D(string s, int i, object o, decimal d);

​delegate-params-reflection.output.txt

[method:{ Void Invoke(System.String, Int32, System.Object, System.Decimal) }]
[parameters:{ System.String s, Int32 i, System.Object o, System.Decimal d }]

​​.sharplab.json

{
    "version": 1,
    "target": "Run",
    "mode": "Release"
}