A strange question about overloading!

 

Today, I found a strange problem when writing a reload. Let's look at such a program first!

 

Static void main (string [] ARGs)
{
Test (null );
}

Static void test (Object OBJ)
{
Console. writeline ("OBJ ");
}

Static void test (object [] OBJ)
{
Console. writeline ("OBJ array ");
}
Class Program
{
Static void main (string [] ARGs)
{
Test (null );
}

Static void test (Object OBJ)
{
Console. writeline ("OBJ ");
}

Static void test (object [] OBJ)
{
Console. writeline ("OBJ array ");
}
}

 

The program output is "OBJ array ".

However, why is test (null); automatically called?

Static void test (object [] OBJ)
{
Console. writeline ("OBJ array ");
}

 

What about this method?

 

I tried to open it with IL, and I didn't find any difference. The IL code is as follows:

. Method private hidebysig static void main (string [] ARGs) cel managed
{
. Entrypoint
// Code size 9 (0x9)
. Maxstack 8
Il_0000: NOP
Il_0001: ldnull
Il_0002: Call void consoleapplication1.program: Test (object [])
Il_0007: NOP
Il_0008: Ret

} // End of method program: Main

 

* ********** This is the main method ************

 

. Method private hidebysig static void test (object [] OBJ) cel managed
{
// Code size 13 (0xd)
. Maxstack 8
Il_0000: NOP
Il_0001: ldstr "OBJ array"
Il_0006: Call void [mscorlib] system. Console: writeline (string)
Il_000b: NOP
Il_000c: Ret
} // End of method program: Test

* ********** This is the ************* of the test (object [] OBJ) method ************

 

. Method private hidebysig static void test (Object OBJ) cel managed
{
// Code size 13 (0xd)
. Maxstack 8
Il_0000: NOP
Il_0001: ldstr "OBJ"
Il_0006: Call void [mscorlib] system. Console: writeline (string)
Il_000b: NOP
Il_000c: Ret
} // End of method program: Test

* ********** This is the ************** of the test (Object OBJ) method ************

 

. Method private hidebysig static void test (object [] OBJ) cel managed
{
// Code size 13 (0xd)
. Maxstack 8
Il_0000: NOP
Il_0001: ldstr "OBJ array"
Il_0006: Call void [mscorlib] system. Console: writeline (string)
Il_000b: NOP
Il_000c: Ret
} // End of method program: Test

 

Conclusion: The best solution is to add a overload without parameters. In this way, everything will be OK! (Thanks To qu bin*)

Static void main (string [] ARGs)
{
Test ();
}

Static void test ()
{
Console. writeline ("null ");
}

Static void test (Object OBJ)
{
Console. writeline ("OBJ ");
}

Static void test (object [] OBJ)
{
Console. writeline ("OBJ array ");
}