请解释这个对象[，] obj Data = new Object [rowCnt，20] [英] Please explain this object[,] obj Data = new Object[rowCnt, 20]

问题描述

我在我的项目中得到了这个： - object [，] objData = new Object [rowCnt，20] ...



请让我知道为什么逗号（ ，）在Object之后的方括号中。

以及上面代码行中指定的rowCnt和20......

解决方案

OK：它指定这是一个二维数组。

 对象 [] ar =  new  对象 [ 5 ]; 

创建一个包含5个对象的数组 - 这是一维数组，因为要访问它，您只需提供一个坐标，或 index ：

  object  o1 = ar [ 0 ]; 
  object  o2 = ar [ 1 ]; 
  object  o3 = ar [ 2 ]; 
  object  o4 = ar [ 3 ]; 
  object  o5 = ar [ 4 ]; 

添加时一个逗号，你创建一个二维数组：

  object  [，] ar =  new   object  [ 3 ， 5 ]; 

这将创建一个包含15个对象的数组 - 三行乘五列 - 它需要两个坐标或索引访问：

  object  o1 = ar [ 0 ， 0 ]; 
  object  o2 = ar [ 0 ， 1 ]; 
  object  o3 = ar [ 0 ， 2 ]; 
  object  o4 = ar [ 0 ， 3 ]; 
  object  o5 = ar [ 0 ， 4 ]; 
  object  o6 = ar [ 1 ， 0 ]; 
  object  o7 = ar [ 1 ， 1 ]; 
  object  o8 = ar [ 1 ， 2 ]; 
  object  o9 = ar [ 1 ， 3 ]; 
  object  o10 = ar [ 1 ， 4 ]; 
  object  o11 = ar [ 2 ， 0 ]; 
  object  o12 = ar [ 2 ， 1 ]; 
  object  o13 = ar [ 2 ， 2 ]; 
  object  o14 = ar [ 2 ， 3 ]; 
  object  o15 = ar [ 2 ， 4 ]; 

还有一个Jagged数组，其中每行的列数不相同：

 < span class =code-keyword> object  [] [] ar =  new   object  [ 3 ]; 
 ar [ 0 ] =  new   object  [ 5 ]; 
 ar [ 1 ] =  new   object  [ 2 ]; 
 ar [ 2 ] =  new   object  [ 1024 ]; 

同样，这需要索引，但这次你需要更加小心！

  object   01  = ar [ 0 ] [ 3 ]; 

没问题，但

< pre lang =c＃> object o1 = ar [ 1 ] [ 3 ];

会给你一个错误，因为第二行没有足够的元素！

I got this in my project:- object[,] objData = new Object[rowCnt, 20] ...

Please let me know why comma(,) is there in square brackets after Object.
and what "rowCnt" and "20" specify in the above line of code...

解决方案

OK: it specifies that this is a two dimensional array.

object[] ar = new object[5];

creates an array of 5 objects - this is a one dimensional array because to access it you only need to provide one coordinate, or index:

object o1 = ar[0];
object o2 = ar[1];
object o3 = ar[2];
object o4 = ar[3];
object o5 = ar[4];

When you add a comma, you create a two dimensional array:

object[,] ar = new object[3, 5];

This creates an array of 15 objects - three rows by five columns - and it requires two coordinates or indexes to access:

object o1 = ar[0, 0];
object o2 = ar[0, 1];
object o3 = ar[0, 2];
object o4 = ar[0, 3];
object o5 = ar[0, 4];
object o6 = ar[1, 0];
object o7 = ar[1, 1];
object o8 = ar[1, 2];
object o9 = ar[1, 3];
object o10 = ar[1, 4];
object o11 = ar[2, 0];
object o12 = ar[2, 1];
object o13 = ar[2, 2];
object o14 = ar[2, 3];
object o15 = ar[2, 4];

There is also a Jagged array, where the number of columns for each row are not the same:

object[][] ar = new object[3];
ar[0] = new object[5];
ar[1] = new object[2];
ar[2] = new object[1024];

Again, this requires to indexes, but this time you have to be a lot more carefull!

object 01 = ar[0][3];

is fine, but

object o1 = ar[1][3];

will give you an error because the second row does not contain enough elements!

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