[Solved] C# combine to list in json object

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This is a textbook example of a nested loop. Loops can contain other loops, where the inner one repeats for each element of the outer one. This one might look something like:

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 });

solved C# combine to list in json object