c#在json对象中组合列表

本文关键字：组合 列表 对象 json | 更新日期: 2023-09-27 18:08:16

我有两个字符串列表:

        List<string> tmpCols = new List<string>();
        List<string> tmpRows = new List<string>();

。tmpCols = [A,B,C];and tmpRows = [X, Y];

我需要迭代这两个列表，并得到一个Json结果，像这样:

        new matrix() { id = "1", col = "A", row = "X" });
        new matrix() { id = "2", col = "B", row = "X" });
        new matrix() { id = "3", col = "C", row = "X" });
        new matrix() { id = "4", col = "A", row = "Y" });
        new matrix() { id = "5", col = "B", row = "Y" });
        new matrix() { id = "6", col = "C", row = "Y" });

本例中的维度为2行3列

c#在json对象中组合列表

这是一个教科书式的嵌套循环示例。循环可以包含其他循环，其中内部循环为外部循环的每个元素重复。这个可能看起来像:

var result = new List<matrix>();
var count = 1;
foreach (var r in tmpRows)
    foreach (var c in tmpCols)
        result.Add(new matrix { id = (count++).ToString(), col = c, row = r });

我觉得这是个迟来的回答

需要迭代这两个列表并得到一个Json结果，像这样:

不是json，我猜你想要这样的格式

List<string> tmpCols = new List<string>() { "A", "B", "C" };
List<string> tmpRows = new List<string>() { "X", "Y" };
var query = tmpCols.SelectMany(c => tmpRows.Select(r => new {id=index++, col=c, row = r }));
var json = JsonConvert.SerializeObject(query, Newtonsoft.Json.Formatting.Indented);
Console.WriteLine(json);
输出:

[
  {
    "id": 6,
    "col": "A",
    "row": "X"
  },
  {
    "id": 7,
    "col": "A",
    "row": "Y"
  },
  {
    "id": 8,
    "col": "B",
    "row": "X"
  },
  {
    "id": 9,
    "col": "B",
    "row": "Y"
  },
  {
    "id": 10,
    "col": "C",
    "row": "X"
  },
  {
    "id": 11,
    "col": "C",
    "row": "Y"
  }
]

使用以下代码解决:

        var tmpMatrix = new List<matrix>();
        for (int k = 0; k < tmpRows.Count; k++)
        {
            for (int j = 0; j < tmpCols.Count; j++)
            {
                int ident = k*tmpCols.Count + j;
                tmpMatrix.Add(new matrix() { id = ident.ToString(), col = tmpCols[j], row = tmpRows[k] });
            }
        }
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