C#•16mo ago

✅ [JsonProprety] isn't being respected ASP.NET Core

Howdy! I've been having this issue that I can't get figure out. For context this is a ASP.NET Core WebAPI I have only one controller which is causing me issues and I can't quite figure out why. This is the signature for it:

[HttpPost]
public async Task<IActionResult> Post([FromForm] PostRequest request, [FromForm] IFormFile? file)
{
  ...
}

[HttpPost]
public async Task<IActionResult> Post([FromForm] PostRequest request, [FromForm] IFormFile? file)
{
  ...
}

This is how PostRequest class looks like:

using Newtonsoft.Json;

public class PostRequest
{
    [JsonProperty("stamps")]
    public bool TimeStamps { get; set; }

    [JsonProperty("lang")]
    public string Lang { get; set; } = "auto";

    [JsonProperty("translate")]
    public bool Translate { get; set; }

    [JsonProperty("model")]
    public string Model { get; set; } = "base";
}

using Newtonsoft.Json;

public class PostRequest
{
    [JsonProperty("stamps")]
    public bool TimeStamps { get; set; }

    [JsonProperty("lang")]
    public string Lang { get; set; } = "auto";

    [JsonProperty("translate")]
    public bool Translate { get; set; }

    [JsonProperty("model")]
    public string Model { get; set; } = "base";
}

The issue is that [JsonProperty] Attribute isn't being respected, whenever I sent a request like this:

curl -X POST \
  -H "Content-Type: multipart/form-data" \
  -F "file=@/path/to/file.mp3" \
  -F "lang=en" \
  -F 'stamps=true' \
  -F "model=base" \
  -F "translate=true" \
  <insert url>

curl -X POST \
  -H "Content-Type: multipart/form-data" \
  -F "file=@/path/to/file.mp3" \
  -F "lang=en" \
  -F 'stamps=true' \
  -F "model=base" \
  -F "translate=true" \
  <insert url>

The TimeStamps doesn't get set to true even though it has the stamps attribute. If I set stamps in curl to timestamps it will work which leads me to believe that they're something wrong with the attributes. 🤔 I originally was using System.Text.Json but switch to Newtonsoft.Json thinking It might be a bug in System.Text.Json but sadly nothing changed.

7 Replies

Mayor McCheese•16mo ago

Iirc default package is System.Text.Json (STJ) and uses a different attribute You have to do something different in builder to use newtonsoft

Sarco•16mo ago

Do you know what's the other Attribute called? 🤔

ACiDCA7•16mo ago

i think its JsonPropertyName https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/customize-properties?pivots=dotnet-7-0

How to customize property names and values with System.Text.Json

Learn how to customize property names and values when serializing with System.Text.Json in .NET.

Mayor McCheese•16mo ago

public class WeatherForecastWithPropertyNameAttribute { public DateTimeOffset Date { get; set; } public int TemperatureCelsius { get; set; } public string? Summary { get; set; } [JsonPropertyName("Wind")] public int WindSpeed { get; set; } }

Sarco•16mo ago

I was originally using System.Text.Json and JsonPropertyName I still had same isuse

Wz•16mo ago

Change all the JsonProperty to FromForm https://learn.microsoft.com/en-us/aspnet/core/mvc/models/model-binding?view=aspnetcore-7.0#model-binding-simple-and-complex-types

Model Binding in ASP.NET Core

Learn how model binding in ASP.NET Core works and how to customize its behavior.

Sarco•16mo ago

Thank you a lot! That worked

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✅ [JsonProprety] isn't being respected ASP.NET Core