C# IFormFile Web Api PUT/POST wants application/json rather than multipart/form-data

[johnwnowlin]

Using C# 6, Carter 6.1.1 to create a PUT web api end point.

something like:

public void AddRoutes(IEndpointRouteBuilder app)
{
    app.MapPut("api/putLogo/{customerNumber}", PutLogo);
}
public async Task<IResult> Put(string customerNumber, IFormFile file) { 
 // get all the file information.
}

Unfortunately, swagger sees it as a "application/json" and therefore returns

Microsoft.AspNetCore.Http.BadHttpRequestException: Failed to read parameter "IFormFile file" from the request body as JSON. ---> System.Text.Json.JsonException: '0x89' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0. ---> System.Text.Json.JsonReaderException: '0x89' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.

PostMan oddly returns a 404. I have tried it without the customerNumber parm, annotated [FromForm], [FromBody] etc.

I can take the same code and move it to an ApiController and it works as expected.

using Microsoft.AspNetCore.Mvc;

using static RepData.Domain.IFSClient;

namespace RepData.Controllers;
[Route("api/[controller]")]
[ApiController]
public class LogoController : ControllerBase
{
    [HttpPut("{customerNumber}")]
    public async Task<IResult> Put(string customerNumber, IFormFile file)
    {

Not sure if I have something configured oddly or what, but it is what I am seeing.

[jchannon]

I’m not sure net6.0 minimal api supports file binding. You will have to use request.Form.Files or use the Carter extension methods called request.BindFile(s)

On Fri, 14 Jun 2024 at 18:50, John Nowlin @.***> wrote:

Using C# 6, Carter 6.1.1 to create a PUT web api end point.

something like:

public void AddRoutes(IEndpointRouteBuilder app){ app.MapPut("api/putLogo/{customerNumber}", PutLogo);}public async Task Put(string customerNumber, IFormFile file) { // get all the file information.}

Unfortunately, swagger sees it as a "application/json" and therefore returns

Microsoft.AspNetCore.Http.BadHttpRequestException: Failed to read parameter "IFormFile file" from the request body as JSON. ---> System.Text.Json.JsonException: '0x89' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0. ---> System.Text.Json.JsonReaderException: '0x89' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.

PostMan oddly returns a 404. I have tried it without the customerNumber parm, annotated [FromForm], [FromBody] etc.

I can take the same code and move it to an ApiController and it works as expected.

using Microsoft.AspNetCore.Mvc; using static RepData.Domain.IFSClient; namespace RepData.Controllers;[Route("api/[controller]")][ApiController]public class LogoController : ControllerBase{ [HttpPut("{customerNumber}")] public async Task Put(string customerNumber, IFormFile file) {

Not sure if I have something configured oddly or what, but it is what I am seeing.

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