Parse Json works partly - empty sub object

Question

I want to parse a json file. My first attempt with a simplified version was only partial successfull.

The simplifiend json structure looks like this

{
    "rowCount": 102,
    "data": [
        {"id": "56", "bezeichnung": "Main Center", "strasse": "foostreet"},
        {"id": "34", "bezeichnung": "Side Location", "strasse": "5th aveneue"}
    ]
}

For the outer json { "rowCount":102, "data":[]} i have a class jsonEnvelope which looks like this

public class JsonEnvelope
{
    public int RowCount { get; set; }
    public Location[] Data{ get; set; }
}

To parse the json inside the array data "data":[] i have class location which looks like this

public class Location
{
  public string id;
  public string bezeichnung;
  public string strasse;
}

My code to parse the json looks like this

string jsonString = GetJsonFromFile();
var jsonEnvelope = new JsonEnvelope();

var options = new JsonSerializerOptions();
options.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
jsonEnvelope = JsonSerializer.Deserialize<JsonEnvelope>(jsonString, options);
foreach (Location h in jsonEnvelope.Data)
{
    Console.WriteLine(String.Format("{0} in {1}", h.bezeichnung, h.strasse));
}
Console.WriteLine("row count = " + jsonEnvelope.RowCount);

What is working?

The line jsonEnvelope.RowCount works. The number 102 is written to the console

The foreach is not working the values of h.bezeichnung and h.strasse are not written to the console

Question

while writing my question i figured it out - i will self answer it briefly

surfmuggle · Accepted Answer · 2021-04-23 08:27:17Z

1

The problem was that i used a field in class location instead of property. Changing the class location to this solved the issue

public class Location
{
    public string Id { get; set; }
    public string Bezeichnung { get; set; }
    public string Strasse { get; set; } 
}

edited Apr 23, 2021 at 8:27

answered Apr 23, 2021 at 8:20

surfmuggle

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Comments

tmaj · Accepted Answer · 2021-04-23 08:35:54Z

1

Please note that with:

.NET 5 or
System.Text.Json package version 5 added to Core3.1 projects you can use IncludeFields option:

var serializeOptions = new JsonSerializerOptions
{
    IncludeFields = true,
};

var o = JsonSerializer.Deserialize<Location>(json, serializeOptions);

answered Apr 23, 2021 at 8:35

tmaj

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1 Comment

surfmuggle Over a year ago

Thanks for pointing that out. Hint "use fields only for variables that have private or protected accessibility. Data that your class exposes to client code should be provided through methods, properties, and indexers." learn.microsoft.com

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