Question

我有一个C＃数组，我希望从中获取每个元素并将其存储在每个csv单元格中。我写了以下内容：

StreamWriter file = new StreamWriter("C:/mylocation/data.csv");
//my2darray  is my 2d array created.
for (int i = 0; i < my2darray.GetLength(1); i++)
   {
            for (int j=0; j<my2darray.GetLength(0);j++)
            {
                file.Write(my2darray[i][j]);
                file.Write("\t");
            }
            file.Write("\n"); // go to next line
     }

问题是每个csv单元包含多个数组元素。如何解决？

Answer 1

我会把循环写成像这样的东西：

  var my2darray = new[,]
  {
    { true, false, false, true },
    { true, false, false, true },
    { true, false, false, true },
    { true, false, false, true },
    { true, false, false, true },
  };

  var iLength = my2darray.GetLength(1);
  var jLength = my2darray.GetLength(0);

  for (int i = 0; i < iLength; i++)
  {
    for (int j = 0; j < jLength; j++)
    {
      file.Write("{0}\t", my2darray[j, i]);
    }
    file.WriteLine();
  }

请注意，当您使用my2darray.GetLength（x）时，您的数组的类型为arr [，]而不是arr [] []。

另请注意，如果您希望在csv文件中转换矩阵，则必须更改i和y：my2darray [j，i]

锯齿状的版本可能是这样的（期望j维度i等于通过外部数组（i-dimension）：

  var my2darray = new[]
  {
    new [] { true, false, false, true },
    new [] { true, false, false, true },
    new [] { true, false, false, true },
    new [] { true, false, false, true },
    new [] { true, false, false, true },
  };

  var iLength = my2darray.Length;
  var jLength = my2darray[0].Length;

  for (int j = 0; j < jLength; j++)
  {
    for (int i = 0; i < iLength; i++)
    {
      Console.Write("{0}\t", my2darray[i][j]);
    }
    Console.WriteLine();
  }

Answer 2

我更愿意将CSV代表并保存：

private static IEnumerable<String> ToCsv<T>(T[,] data, string separator = ",") {
  for (int i = 0; i < data.GetLength(0); ++i)
    yield return string.Join(separator, Enumerable
      .Range(0, data.GetLength(1))
      .Select(j => data[i, j])); // simplest, we don't expect ',' and '"' in the items
}

...

File.WriteAllLines(@"C:/mylocation/data.csv",
  ToCsv(my2array));

Answer 3

有效。您可能没有使用正确的分隔符。试试＆＃34; \ r \ n＆＃34;换行并使用你的csv分隔符，例如＆＃34;，＆＃34;

Answer 4

我得到了一个解决方案，如@ adv12

暗示的那样稍作修改

StreamWriter file = new StreamWriter("C:/mylocation/data.csv");
//my2darray  is my 2d array created.
for (int i = 0; i < my2darray.GetLength(1); i++)
  {
        for (int j=0; j<my2darray.GetLength(0);j++)
        {  
            file.Write(my2darray[i,j]);

            //it is comman and not a tab
            file.Write(",");  
        }
        //go to next line
        file.Write("\n"); 

 }

将2维c＃数组的内容存储到csv文件中

4 个答案: