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Setting up JsonOutputFormatter with AddMvcCore

I am trying to set up an ASP.NET Core thin pipeline and am using AddMvcCore

instead AddMvc

. I copied this mostly from AddMvc , omitting the Razor related items:

public void ConfigureServices(IServiceCollection services) =>
    services
        .AddMvcCore(
            options => 
            {
                // JsonOutputFormatter not found in OutputFormatters!
                var jsonOutputFormatter = 
                    options.OutputFormatters.OfType<JsonOutputFormatter>.First();
                jsonOutputFormatter.SupportedMediaTypes.Add("application/ld+json");
            })
        .AddApiExplorer()
        .AddAuthorization()
        .AddFormatterMappings()
        .AddRazorViewEngine()
        .AddRazorPages()
        .AddCacheTagHelper()
        .AddDataAnnotations()
        .AddJsonFormatters()
        .AddCors();

I want to add a MIME type to JsonOutputFormatter

, but it cannot be found in the collection OutputFormatters

. However, the application can still output JSON, so I think this JsonOutputFormatter

is being added later. How can I get the JsonOutputFormatter?

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2 answers


You can use AddMvcOptions

at the end (position important) to access the JSON formatters after adding them:



services
    .AddMvcCore()
    .AddJsonFormatters()
    .AddMvcOptions(options => { // do your work here });
+2


source 


public void ConfigureServices(IServiceCollection services) =>
services
    .AddMvcCore(
        options => 
        {
            var jsonOutputFormatter = options.OutputFormatters.FirstOrDefault(p => p.GetType() == typeof(JsonOutputFormatter)) as JsonOutputFormatter;

            // Then add
            jsonOutputFormatter?.SupportedMediaTypes.Add("application/ld+json");
        })
    .AddApiExplorer()
    .AddAuthorization()
    .AddFormatterMappings()
    .AddRazorViewEngine()
    .AddRazorPages()
    .AddCacheTagHelper()
    .AddDataAnnotations()
    .AddJsonFormatters()
    .AddCors();


+1


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