Reflection in c#

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C#

public static void Main()
       {
           int[,] a = new int[3,4];
           a[1, 1] = 10;
           int y = a[1, 1];

Now the ildasm shows me following output-

.method public hidebysig static void  Main() cil managed
{
  .entrypoint
  // Code size       29 (0x1d)
  .maxstack  4
  .locals init ([0] int32[0...,0...] a,
           [1] int32 y)
  IL_0000:  nop
  IL_0001:  ldc.i4.3
  IL_0002:  ldc.i4.4
  IL_0003:  newobj     instance void int32[0...,0...]::.ctor(int32,
                                                             int32)
  IL_0008:  stloc.0
  IL_0009:  ldloc.0
  IL_000a:  ldc.i4.1
  IL_000b:  ldc.i4.1
  IL_000c:  ldc.i4.s   10
  IL_000e:  call       instance void int32[0...,0...]::Set(int32,
                                                           int32,
                                                           int32)
  IL_0013:  ldloc.0
  IL_0014:  ldc.i4.1
  IL_0015:  ldc.i4.1
  IL_0016:  call       instance int32 int32[0...,0...]::Get(int32,
                                                            int32)
  IL_001b:  stloc.1
  IL_001c:  ret
} // end of method Class5::Main

Now see also result for three dimentionl array

public static void Main()
        {
            int[,,] a = new int[3,4,3];
            a[1, 1,2] = 10;
            int y = a[1, 1,2];
        }

Now see ildasm result

.method public hidebysig static void  Main() cil managed
{
  .entrypoint
  // Code size       32 (0x20)
  .maxstack  5
  .locals init ([0] int32[0...,0...,0...] a,
           [1] int32 y)
  IL_0000:  nop
  IL_0001:  ldc.i4.3
  IL_0002:  ldc.i4.4
  IL_0003:  ldc.i4.3
  IL_0004:  newobj     instance void int32[0...,0...,0...]::.ctor(int32,
                                                                  int32,
                                                                  int32)
  IL_0009:  stloc.0
  IL_000a:  ldloc.0
  IL_000b:  ldc.i4.1
  IL_000c:  ldc.i4.1
  IL_000d:  ldc.i4.2
  IL_000e:  ldc.i4.s   10
  IL_0010:  call       instance void int32[0...,0...,0...]::Set(int32,
                                                                int32,
                                                                int32,
                                                                int32)
  IL_0015:  ldloc.0
  IL_0016:  ldc.i4.1
  IL_0017:  ldc.i4.1
  IL_0018:  ldc.i4.2
  IL_0019:  call       instance int32 int32[0...,0...,0...]::Get(int32,
                                                                 int32,
                                                                 int32)
  IL_001e:  stloc.1
  IL_001f:  ret
} // end of method Class5::Main

Now my question is that
Is set,get,constructor of System.Array class uses params int[] as parameter
But if it is then reflection is not showing such "Set(params int[])"output in reflection.
How this result is possible?

Posted 20-Oct-12 0:55am

fdiu

Updated 20-Oct-12 0:57am

v3

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OriginalGriff · Accepted Answer · 2012-10-20T00:58:00

Solution 1

params is a C# specific language feature: it is seen in ILDASM as int, int, int... as ILDASM doesn't have (or need) such a construct - it is effectively an assembler language, rather than high level.

Posted 20-Oct-12 0:58am

OriginalGriff

Comments

fdiu 20-Oct-12 7:05am

class Class5
{
public static void Main()
{
demo d = new demo();
d.xx(1, 2, 3, 4);
}
}
class demo
{
public void xx(params int[] a)
{

}
}

Here is ildasm output:

.method public hidebysig static void Main() cil managed
{
.entrypoint
// Code size 39 (0x27)
.maxstack 4
.locals init ([0] class data_types_literals_and_variables.demo d,
[1] int32[] CS$0$0000)
IL_0000: nop
IL_0001: newobj instance void data_types_literals_and_variables.demo::.ctor()
IL_0006: stloc.0
IL_0007: ldloc.0
IL_0008: ldc.i4.4
IL_0009: newarr [mscorlib]System.Int32
IL_000e: stloc.1
IL_000f: ldloc.1
IL_0010: ldc.i4.0
IL_0011: ldc.i4.1
IL_0012: stelem.i4
IL_0013: ldloc.1
IL_0014: ldc.i4.1
IL_0015: ldc.i4.2
IL_0016: stelem.i4
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: ldc.i4.3
IL_001a: stelem.i4
IL_001b: ldloc.1
IL_001c: ldc.i4.3
IL_001d: ldc.i4.4
IL_001e: stelem.i4
IL_001f: ldloc.1
IL_0020: callvirt instance void data_types_literals_and_variables.demo::xx(int32[])
IL_0025: nop
IL_0026: ret
} // end of method Class5::Main

see it shows xx(int32[]) not shows xx(int32,int32,int32,int32)