Effective C#: 2.以嵌套数组取代 多维数组[4]

il_0000:  ldloc.1 //ma

il_0001:  dup

il_0002:  ldc.i4.1

il_0003:  ldc.i4.2

il_0004:  ldc.i4.1

il_0005:  ldc.i4.2

il_0006:  call instance int32

          int32[0...,0...]::get(int32,

                                int32)

il_000b:  ldc.i4.1

il_000c:  add

il_000d:  call       instance void

          int32[0...,0...]::set(int32,

                                int32,