Why is Request.Content.ReadAsAsync case insensitive?

Question

Suppose I have the json payload sent from the client side as following

{"Number": 2, "number": 4}

Over on the server side, I have this model class.

public class Arg
{
    public int Number { get; set; }
}

The payload is deserialised in my controller like so:

Request.Content.ReadAsAsync<Arg>();

Why is Arg.Number == 4? How can I make ReadAsAsync case sensitive?

Answer 1

Deserialization done via Json.NET. I am digging into process and end up with next code:

public JsonProperty GetClosestMatchProperty(string propertyName)
{
    JsonProperty property = GetProperty(propertyName, StringComparison.Ordinal);
    if (property == null)
        property = GetProperty(propertyName, StringComparison.OrdinalIgnoreCase);

    return property;
}

So as you can see, if it fails to get property using String.Ordinal comparer, it will try String.OrdinalIgnoreCase , and thats why it overrides your value.

For name I see only one solution to add dummy property to catch this value:

public class Arg
{
    [JsonProperty("Number")]
    public int Number { get; set; }

    [JsonProperty("number")]
    public int SmallNumber { get; set; }
}

Answer 2

You need to add a new property in your custom deserializer

public class Arg
{
    public int Number { get; set; }
    public int number { get; set; }
}

Tested using newtonsoft

Trying to defining your class as wont work

public class Arg
{
    [JsonProperty("Number")]
    public int Number { get; set; }
}