.NET 6 Minimal API and multipart/form-data-CodePudding

Using the .NET 6 Minimal API, I'm trying to handle multipart/form-data in the POST method. However, with the following code:

app.MapPost("/tickets", async (IFreshdeskApiService s, [FromForm] CreateTicketDto dto) => await s.Add(dto))
   .Accepts<CreateTicketDto>("multipart/form-data");

I'm receiving 400 Bad Request with body:

{
    "error": "Expected a supported JSON media type but got \"multipart/form-data; boundary=--------------------------391539519671819893009831\"."
}

I switched to the non-minimal API (i.e. using app.MapControllers()), but is there any way to handle this in minimal API?

CodePudding user response：

Please see the Explicit Parameter Binding section of

Personally, I would remove the [FromForm] attribute from the endpoint, however, in my testing it works with or without it. The above technique will work with class types too, not just records.

Simpler alternative

A simpler implementation is to pass HttpContext into the action and read all values from the ctx.Request.Form collection. In this case your action might look something like the following:

app.MapPost("/tickets", (HttpContext ctx, IFreshdeskApiService s) =>
{
    // read value from Form collection
    int.TryParse(ctx.Request.Form["Id"], out var id);
    var name = ctx.Request.Form["Name"];
    var status = ctx.Request.Form["Status"];

    var dto = new CreateTicketDto(id, name, status);
 
    s.Add(dto);
    return Results.Accepted(value: dto);
});