JsonConvert.SerializeObject 和处理空字符串

Question

I have an object that is returned from a web service containing empty strings. The object is called Docs and the object Docs.Rows is a List<List<string>> which is then used in the code below as filteredRows . When I use JsonConvert.SerializeObject , it removes every column that has an empty string. These columns are important.

I've tried these 2 approaches:

JsonConvert.SerializeObject(filteredRows,
    Formatting.Indented,
    new JsonSerializerSettings { });

JsonConvert.SerializeObject(filteredRows,
    Formatting.Indented,
    new JsonSerializerSettings { NullValueHandling = NullValueHandling.Include });

All columns with empty strings are still being removed. How do I make it keep them?

The filteredRows is also defined as List<List<string>> . Can I serialize that into a defined object?

Answer 1

Can you provide an example program that demonstrates the problem? A simple example like the following seems to work fine. Neither null nor empty strings are removed during serialization. Could it be your filtering process that is actually removing the values?

class Program
{
    static void Main(string[] args)
    {
        List<List<string>> rows = new List<List<string>>
        {
            new List<string>
            {
                "A",
                null,
                ""
            },
            new List<string>
            {
                null,
                "B",
                ""
            },
            new List<string>
            {
                "",
                null,
                "C"
            }
        };

        string json = JsonConvert.SerializeObject(rows);
        Console.WriteLine(json);
    }
}

Output:

[["A",null,""],[null,"B",""],["",null,"C"]]