JSON deserialization returns {null,null} for KeyValuePair

Question

I've declared the below key:value pair in JSON:

"saleParameters": [
        {"saleName":"FlashSale2018"},
  ]

I'm mapping the above using the below property in my contract class:

    [JsonProperty("saleParameters")]
    public IEnumerable<KeyValuePair<string,string>> SaleParameters { get; set; }

But for some reason, I always receive null values in SaleParameters after deserialization. I'm using NewtonSoft.JSON for JSON serialize/deserialize, code is running on .net core.

Any idea on why this is happening and how to solve this ?

Pardon me, but I didn't get it. If it's working in that editor, why is it not working with the above format ? — vinit
– vinit, Commented Oct 4, 2018 at 4:26

ProgrammingLlama · Accepted Answer · 2018-10-04 12:07:35Z

3

The problem is that your current code expects JSON like this:

"saleParameters": [
    {"Key": "saleName", "Value": "FlashSale2018"}]
]

You should use a dictionary instead:

public IEnumerable<IDictionary<string,string>> SaleParameters { get; set; }

This will deserialize "saleName" as they key and "FlashSale2018" as the value. And, if you really need IEnumerable<KeyValuePair<string, string>>, you can call SaleParameters.SelectMany(p => p). ToEnumerable().

edited Oct 4, 2018 at 12:07

answered Oct 4, 2018 at 4:37

ProgrammingLlama

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2 Comments

dbc Over a year ago

Actually, since the outer JSON container is an array, it needs to be public IEnumerable<Dictionary<string,string>> SaleParameters { get; set; }. Then you can do SaleParameters.SelectMany(d => d).ToList(); to get a flat list.

ProgrammingLlama Over a year ago

@dbc Oops. Yup.

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