. NET, have you forgotten? (vii)--from the perspective of A?B:C

1. The SUMMARY

In this article, I will analyze a simple statement through IL.

If it feels really simple, you can skip it.

2. Intro

The thing is, a colleague wrote a code like this:

class　Program
{
　　　　　　 static　void　Main(string[]　args)
　　　　　　 {
　　　　　　　　　　　　 object　o　=　new　object();
　　　　　　　　　　　　 int　i;
　　　　　　　　　　　　 Int32.TryParse(Console.ReadLine(),　out　i);
　　　　　　　　　　　　 o　=　i　>　3　?　null　:　3.5;
　　　　　　 }
}

Not in the console program, of course, I'm just writing a simulation here.

Then the system reported one such error.

3. Error analysis

My colleague asked me in amazement, why is this?

The reason he gives is that object is the parent of all classes, so I have 3.5 or null assigned to him is no problem ah, so what is the problem?

I realized that my language skills were far less persuasive than the code, so write a piece of code and then take the IL.