C#•2y ago

❔ How to calculate event expression?

c#
var result = a+b-c+d-c+d-b+a;

c#
var result = a+b-c+d-c+d-b+a;

a,b,c,d are all events, and each of them contains more than one method. So what is result like?

10 Replies

Thinker•2y ago

What type are they?

thirteenbinaryOP•2y ago

They are events. Like:

c#
delegate void F();
event F a, b, c, d;

c#
delegate void F();
event F a, b, c, d;

Thinker•2y ago

$tias

MODiX•2y ago

https://images-ext-1.discordapp.net/external/CO2vsU2aXbRqYy1RdewOYnkBq1nGFBjdbjlNgjvG67A/https/media.discordapp.net/attachments/364492811489509376/964064233035816990/unknown.png?width=543&height=257

Thinker•2y ago

although I don't know if you can add and subtract delegate types like that

thirteenbinaryOP•2y ago

But I just see the result but I don't know the rule.

MODiX•2y ago

thinker227#5176

REPL Result: Success

delegate void F();

F a = () => Console.WriteLine("a");
F b = () => Console.WriteLine("b");
F c = () => Console.WriteLine("c");
F d = () => Console.WriteLine("d");

var result = a + b - c + d - c + d - b + a;
result();

delegate void F();

F a = () => Console.WriteLine("a");
F b = () => Console.WriteLine("b");
F c = () => Console.WriteLine("c");
F d = () => Console.WriteLine("d");

var result = a + b - c + d - c + d - b + a;
result();

Console Output

a
d
d
a

a
d
d
a

Compile: 697.949ms | Execution: 124.181ms | React with ❌ to remove this embed.

Thinker•2y ago

a + b - c + d - c + d - b + a

a + b - c + d - c + d - b + a

If we think about it like algebra

+ a
+ b
- c (doesn't do anything)
+ d
- c (doesn't do anything)
+ d
- b (removes b)
+ a

+ a
+ b
- c (doesn't do anything)
+ d
- c (doesn't do anything)
+ d
- b (removes b)
+ a

So the result is that + b and - b cancel out, and the - cs don't do anything.

+ a
+ d
+ d
+ a

+ a
+ d
+ d
+ a

thirteenbinaryOP•2y ago

You dismiss a condition, the event can contain more than one method. I want a more general rule like we know 1+1=2.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ How to calculate event expression?