为什么 .txt 文件输出中的每一行都以 'System.int32' 结尾？ C＃

Question

C#, Console Application, Virtual Studio 2015, Paralelles: Windows 8.1.

代码如下：

class txt_program
{
    public void txt()
    {
        /* 0 */
        int[] M_array_0 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        /* 1 */
        int[] M_array_1 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        /* 2 */
        int[] M_array_2 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        // etc.

        // the M matrix
        int[][] M = { M_array_0, M_array_1, M_array_2, M_array_3, M_array_4,
        M_array_5, M_array_6, M_array_7, M_array_8, M_array_9, M_array_10,
        M_array_12, M_array_13 };

        // the time pick is beeing called into this item.
        Time_pick_2 T2 = new Time_pick_2();

        // the if loop making

        // 0
        if (T2.M_build_0() == true)
        {
            int nr_0 = 0;
            for (int i = nr_0; i < nr_0 + 2; i++)
            {
                M[1][i] = M_array_0[i] + 1;
            }
        }

        // 1
        else if (T2.M_build_1() == true)
        {
            int nr_1 = 1;
            for (int i = nr_1; i < nr_1 + 2; i++)
            {
                M[1][i] = M_array_1[i] + 1;
            }
        }

        // 2
        else if (T2.M_build_2() == true)
        {
            int nr_2 = 2;
            for (int i = nr_2; i < nr_2 + 2; i++)
            {
                M[2][i] = M_array_2[i] + 1;

            }
        }

        // etc.



        using (StreamWriter SW = new StreamWriter(@"txt.txt"))
            {
                // the loops creating the .txt-file.
                for (int i = 0; i < M.GetLength(0); i++)
                {
                    for (int a = 0; a < 13; a++)
                    {
                        SW.Write(" " + M[i][a]);
                    }
                    SW.WriteLine(M);
                }
            }
        }
    }
}

作为 pastebin：

http://pastebin.com/3HDYwzzZ

输出为：

0 0 0 0 0 0 0 0 0 0 0 0 0System.Int32[][]
0 1 1 0 0 0 0 0 0 0 0 0 0System.Int32[][]
0 0 0 0 0 0 0 0 0 0 0 0 0System.Int32[][]
// etc.

我检查了一些其他 post 关于 System.Int32[][] 的外观，但在所有情况下，它是代码没有生成任何输出，除了 System.Int32[]，这意味着代码可以不解释 for-loop 创建输出。这里显示了正确的输出，但仍然以 System.Int32[][] 结尾。为什么会这样，我做错了什么？

Answer 1

您在内循环后输出了整个数组。如果你想要一个换行符，你可以使用 Console.WriteLine("")

using (StreamWriter SW = new StreamWriter(@"txt.txt"))
{
    // the loops creating the .txt-file.
    for (int i = 0; i < M.GetLength(0); i++)
    {
        for (int a = 0; a < 13; a++)
        {
            SW.Write(" " + M[i][a]);
        }
        //SW.WriteLine(M); // <-- this line was generating your output
        SW.WriteLine("");
    }
}

Answer 2

默认情况下，ToString 方法returns对象的类型。因此，如果您在不覆盖 ToString 方法（在 Object class 中定义）的情况下打印非原始类型，您将获得类型名称。

您遇到的问题是：

SW.WriteLine(M);

Answer 3

正如 Heinzbeinz 已经说过的，您正在打印一个数组，该数组在 C# 中将导致打印对象类型，例如：

int[] ar1 = {0,1,2,3};
int[] ar2 = {0,1,2,3};
int[][] m = {ar1,ar2};

Console.WriteLine(m);

将导致打印 System.Int32[][]

为什么 .txt 文件输出中的每一行都以 'System.int32' 结尾？ C＃

Why does every line in the .txt-file output end with 'System.int32'? C#

c#

int32

streamwriter