获取“异常".这段代码有什么问题? [英] Getting an 'Exception'. What is wrong in this code?

问题描述

该代码用于并行运行多行，但所有列均按顺序运行..

The code is for running multiple rows in parallel, but all the columns in sequence..

/*************ADDING two 2-d ARRAYS*********/

         int[,] c = new int[2,3];
         int[,] a = { { 1, 2, 3 }, { 4, 5, 6 } };
         int[,] b = { { 1, 2, 3 }, { 4, 5, 6 } };

         int j;

         // Console.WriteLine(c.Length / 2);   To get the length of second dimention of an array.

         Parallel.For(0, c.Length / 2, (int i) =>
             {
                 for (j = 0; j < 3; j++)
                 {
                     c[i, j] = a[i, j] + b[i, j];
                     Console.WriteLine("c[" + i + "," + j + "] = " + c[i, j]);
                 }
             }
         );

推荐答案

这是设计使然，您的Parallel.For仅对行进行操作.

列由普通的for处理.

This is by design, your Parallel.For is operating on rows only.

The columns are processed by a normal for.

如果进行简单检查，原因很明显:

If you do a simple check, the reason is obvious:

int[,] c = new int[2,3];
Console.WriteLine(c.Length / 2);

打印"3".
这意味着i会在0到2之间变化-并超出范围...

Prints "3".
Which means that i will vary between 0 and 2 - and go out of range...

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