How to configure the default XmlSerializer used in .net core api

user_5963571 0
Viewed 2005

Does anybody know how to configure the XML serializer which is added when you use the IMVCBuilder in the Startup up class of a .net core api project. Specifically when you use this:

services.AddMvc()
    .AddJsonOptions(options =>
    {
        options.SerializerSettings.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.IsoDateFormat; // UTC (ISO 8601) format for dates
        options.SerializerSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
    })
    .AddXmlSerializerFormatters()
    .AddXmlDataContractSerializerFormatters()

I tried using the AddXmlOptions extension method but there are no properties the MvcXmlOptions Class (apart from AllowRfc7807CompliantProblemDetailsFormat)

The specific setting I am trying to configure is to omit the xml declaration from the root element. There a plenty of answers on here which address this but they all involve instantiating a new XmlSerializer. I need the setting to apply the default serializer used by a controller when the Accept header is set to application/xml

asp.net-core .net-core xml c#
2 Answers

You can get to the XmlWriterSettings used by the output-formatter using something like the following:

services.Configure<MvcOptions>(options =>
{
    var xmlWriterSettings = options.OutputFormatters
        .OfType<XmlSerializerOutputFormatter>()
        .Single()
        .WriterSettings;

    xmlWriterSettings.OmitXmlDeclaration = true;
});

The call to AddXmlSerializerFormatters adds an instance of XmlSerializerOutputFormatter. The code above finds that particular instance and modifies its settings accordingly.

user_26300780

Try this:

services.Configure<MvcXmlOptions>(options =>
{
    //set options here
});
user_2395940
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