C#中的System.Array

问题描述

我对C#中的数组实现感到惊讶.
int [] arr = new int [2];
"arr"如何显示System.Array类的方法和属性?.

我知道System.Array类是仅由编译器在内部实例化的，我们无法显式实例化它.

但是a.GetType().Name再次显示int []类型.即，一次保存对数组以及System.Array类的引用

I m amazed by seeing arrays implementation in c#.
int[] arr=new int[2];
how ''arr'' shows methods and properties of System.Array class?.

I know System.Array class is instantiated internally by only compiler we can not explicitly instantiate it.

But again a.GetType().Name shows int[] type.ie a holds reference to array as well as System.Array class at a time ??

推荐答案

class Program
    {
    static void Main(string[] args)
        {
        int[,] arr = new int[2, 3];
        }
    }

并使用ILDASM检查EXE:

And examine the EXE with ILDASM:

.method private hidebysig static void  Main(string[] args) cil managed
{
  .entrypoint
  // Code size       10 (0xa)
  .maxstack  2
  .locals init (int32[0...,0...] V_0)
  IL_0000:  nop
  IL_0001:  ldc.i4.2
  IL_0002:  ldc.i4.3
  IL_0003:  newobj     instance void int32[0...,0...]::.ctor(int32,
                                                             int32)
  IL_0008:  stloc.0
  IL_0009:  ret
} // end of method Program::Main

的结尾您将看到为二维数组定义了一个构造函数.
实际上，它很可能被定义为params int[] dimensions，以允许二维，三维等等.


好，我认为这是System.Array(params int [])的构造函数.
但我的问题实际上是这个，

int i = a [2,2];
然后这里a [2,2]返回一个整数值.
但是System.Array不包含带有两个参数的索引器，因此它如何返回值.然后它如何出现".


同样，解决方案是使用ILDASM进行查看:

You will see that a constructor is defined for two dimensional arrays.
In all probability it is actually defined as params int[] dimensions to allow for two dimensional, three dimensional, and so on.


"Good,I think this is an constructor for System.Array(params int[])
But my question is actually this,

int i=a[2,2];
then here a[2,2] return an integer value.
But System.Array not contain indexer with two parameters so how it returns value.Then how it comes"


Again, the solution is to look at it with ILDASM:

class Program
    {
    static void Main(string[] args)
        {
        int[,] arr = new int[4, 5];
        arr[2, 3] = 7;
        }
    }

.method private hidebysig static void  Main(string[] args) cil managed
{
  .entrypoint
  // Code size       19 (0x13)
  .maxstack  4
  .locals init (int32[0...,0...] V_0)
  IL_0000:  nop
  IL_0001:  ldc.i4.4
  IL_0002:  ldc.i4.5
  IL_0003:  newobj     instance void int32[0...,0...]::.ctor(int32,
                                                             int32)
  IL_0008:  stloc.0
  IL_0009:  ldloc.0
  IL_000a:  ldc.i4.2
  IL_000b:  ldc.i4.3
  IL_000c:  ldc.i4.7
  IL_000d:  call       instance void int32[0...,0...]::Set(int32,
                                                           int32,
                                                           int32)
  IL_0012:  ret
} // end of method Program::Main

的结尾，同样，我会怀疑Set方法的params参数.

对于Get方法，结果类似:

Again, I would suspect a params parameter to the Set method.

And a similar result for the Get method:

class Program
    {
    static void Main(string[] args)
        {
        int[,] arr = new int[4, 5];
        arr[2, 3] = 7;
        int i = arr[2, 3];
        }
    }

.method private hidebysig static void  Main(string[] args) cil managed
{
  .entrypoint
  // Code size       28 (0x1c)
  .maxstack  4
  .locals init ([0] int32[0...,0...] arr,
           [1] int32 i)
  IL_0000:  nop
  IL_0001:  ldc.i4.4
  IL_0002:  ldc.i4.5
  IL_0003:  newobj     instance void int32[0...,0...]::.ctor(int32,
                                                             int32)
  IL_0008:  stloc.0
  IL_0009:  ldloc.0
  IL_000a:  ldc.i4.2
  IL_000b:  ldc.i4.3
  IL_000c:  ldc.i4.7
  IL_000d:  call       instance void int32[0...,0...]::Set(int32,
                                                           int32,
                                                           int32)
  IL_0012:  ldloc.0
  IL_0013:  ldc.i4.2
  IL_0014:  ldc.i4.3
  IL_0015:  call       instance int32 int32[0...,0...]::Get(int32,
                                                            int32)
  IL_001a:  stloc.1
  IL_001b:  ret
} // end of method Program::Main

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