Exactly ! I was trying to compare the IL for both the debug and the release
builds of the code that you had posted ..
class Class1
{
static void Main(string[] args)
{
if( args.Length == 0 )
{
Console.WriteLine("in if");
try
{
}
finally
{
}
}
else
{
Console.WriteLine("in else");
}
}
}
Now the IL suggests this when optimisation is turned ON in release mode and
debug mode !
Release:
.method private hidebysig static void Main(string[] args) cil managed
{
.entrypoint
// Code size 26 (0x1a)
.maxstack 1
IL_0000: ldarg.0
IL_0001: ldlen
IL_0002: conv.i4
IL_0003: brtrue.s IL_000f
IL_0005: ldstr "in if"
IL_000a: call void [mscorlib]System.Console::WriteLine(string)
IL_000f: ldstr "in else"
IL_0014: call void [mscorlib]System.Console::WriteLine(string)
IL_0019: ret
} // end of method Class1::Main
Debug
.method private hidebysig static void Main(string[] args) cil managed
{
.entrypoint
// Code size 31 (0x1f)
.maxstack 1
IL_0000: ldarg.0
IL_0001: ldlen
IL_0002: conv.i4
IL_0003: brtrue.s IL_0014
IL_0005: ldstr "in if"
IL_000a: call void [mscorlib]System.Console::WriteLine(string)
.try
{
IL_000f: leave.s IL_0012
} // end .try
finally
{
IL_0011: endfinally
} // end handler
IL_0012: br.s IL_001e
IL_0014: ldstr "in else"
IL_0019: call void [mscorlib]System.Console::WriteLine(string)
IL_001e: ret
} // end of method Class1::Main
If you see, the optimizer in the release mode has removed the try-catch
block for need to improve speed and to avoid extra IL instructions which do
not have any need or importance since they dont contain any code. Now i
think the compiler has also removed the else block along with the try-catch
and so what has happenned is that the code now is like this .
class Class1
{
static void Main(string[] args)
{
if( args.Length == 0 )
{
Console.WriteLine("in if");
}
Console.WriteLine("in else");
}
}
That explains the problem that shows up as saying, when there are no args,
both "in if" and "in else" show up while if there are then only "in else"
shows up !
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