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New Message on BDOTNET
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From: Anand_2004
Message 5 in Discussion
Hi, To explore this its ideal to look at the IL code of the program .Its look
like as below method private hidebysig static void Main(string[] args) cil
managed
{
.entrypoint
.custom instance void [mscorlib]System.STAThreadAttribute::.ctor() = ( 01 00
00 00 )
// Code size 37 (0x25)
.maxstack 1
.locals init ([0] string initial,
[1] object o,
[2] string 'final',
[3] string IsUnboxing,
[4] string IsUnboxing1)
IL_0000: ldstr "Initialize"
IL_0005: stloc.0
IL_0006: ldloc.0
IL_0007: stloc.1
IL_0008: ldstr "Re-Initialize"
IL_000d: stloc.0
IL_000e: ldloc.1
IL_000f: castclass [mscorlib]System.String
IL_0014: stloc.2
IL_0015: ldloc.1
IL_0016: callvirt instance string [mscorlib]System.Object::ToString()
IL_001b: stloc.3
IL_001c: ldloc.1
IL_001d: isinst [mscorlib]System.String
IL_0022: stloc.s IsUnboxing1
IL_0024: ret
} // end of method Class1::Main its clearly says there is no boxing or
unboxing , actually its called up-casting and down-casting operation .if we
look at another example
static void Main1()
{
int i=500;
object obj=i;
obj=400;
i = (int) obj;
}
the IL code of the above code is
.method private hidebysig static void Main1() cil managed
{
// Code size 33 (0x21)
.maxstack 1
.locals init ([0] int32 i,
[1] object obj)
IL_0000: ldc.i4 0x1f4
IL_0005: stloc.0
IL_0006: ldloc.0
IL_0007: box [mscorlib]System.Int32
IL_000c: stloc.1
IL_000d: ldc.i4 0x190
IL_0012: box [mscorlib]System.Int32
IL_0017: stloc.1
IL_0018: ldloc.1
IL_0019: unbox [mscorlib]System.Int32
IL_001e: ldind.i4
IL_001f: stloc.0
IL_0020: ret
} // end of method Class1::Main1
have a look at the unbox and box symbols that means in this scenario its
actually doing boxing and unboxing.
HTH
Cheers
Thanx<o:p></o:p>
Anand<o:p></o:p>
Blog @ http://spaces.msn.com/members/anandkumar
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