event subscription test | C# Online Compiler

event subscription test by MyBlindy

using System;
using System.Linq.Expressions;
using System.Reflection;

namespace eventtest
{
    class Program
    {
        static event EventHandler E;

        static void Handle(Expression<Func<Delegate>> eventExpression, EventHandler handler)
        {
            // get the event
            var memberExpression = eventExpression.Body as MemberExpression;
            var eventField = memberExpression.Member as FieldInfo;

            // subscribe
            var eventHandlerList = eventField.GetValue(null) as Delegate;
            eventField.SetValue(null, Delegate.Combine(eventHandlerList, handler));
        }

        static void Main(string[] args)
        {
            Handle(() => E, (s, e) => Console.WriteLine("Event received"));
            E(null, EventArgs.Empty);
        }
    }
}

​x
 
using System;
using System.Linq.Expressions;
using System.Reflection;
​
namespace eventtest
{
    class Program
    {
        static event EventHandler E;
​
        static void Handle(Expression<Func<Delegate>> eventExpression, EventHandler handler)
        {
            // get the event
            var memberExpression = eventExpression.Body as MemberExpression;
            var eventField = memberExpression.Member as FieldInfo;
​
            // subscribe
            var eventHandlerList = eventField.GetValue(null) as Delegate;
            eventField.SetValue(null, Delegate.Combine(eventHandlerList, handler));
        }
​
        static void Main(string[] args)
        {
            Handle(() => E, (s, e) => Console.WriteLine("Event received"));
            E(null, EventArgs.Empty);
        }
    }
}
​

Converted the Boolean value 'True' to the Single value 1.
Converted the null value 'null' to the null value null.
Conversion of the Char value a to a float is not supported.
Converted the Int32 value '123' to the Single value 123.
Converted the Double value '1.764E+32' to the Single value 1.764E+32.
Converted the String value '9.78' to the Single value 9.78.
Converted the String value '1e-02' to the Single value 0.01.
Converted the Double value '1670' to the Single value 1670.
The String value A100 is not recognized as a valid float value.
Converted the String value '1,033.67' to the Single value 1033.67.
Conversion of the DateTime value 5/31/2025 3:14:46 AM to a float is not supported.
Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.
Converted the Double value '1.79769313486232E+308' to the Single value ∞.

Last Run:	3:14:46 am
Compile:	0.206s
Execute:	0.046s
Memory:	441.16kb
CPU:	0.109s

View IL Code