The uploaded files are not supported due to a media type error (415)

Although I found a similar query, it didn't provide a solution to the error I am encountering.

Below is the PUT action in my API's Controller, which functions correctly in Swagger:

[HttpPut("{id}/upload")]
public async Task<IActionResult> UploadFile(string id, IFormFile file)  
{
    // code snippets using id are excluded, unrelated to the error

    var path = Path.Combine(
        Directory.GetCurrentDirectory(),
        "wwwroot",
        file.FileName
    );

    using (var stream = new FileStream(path, FileMode.Create))  
    {  
        await file.CopyToAsync(stream);
    }

    return Ok();
}

Here are the snippets of code in my Angular webpage:

HTML

<input type="file" (change)="setFile($event.target.files)"/>

<button (click)="save()"> Save </button>

TypeScript

forUpload: File = null;
@Input() someModel: SomeModel;

// file setup
setFile(myFile: File){
    if (myFile === null){
      return;
    }
    this.forUpload = myFile[0];
}

// saving
save() {
    const addFileFnc = this.theService.addFile.bind(this.theService);
    addFileFnc(this.someModel, this.forUpload).subscribe(
        () => { this.ref.close(); },
        (e) => { console.log(e); }
    );
}

My service counterpart is as follows:

addFile(someModel: SomeModel, myFile: File): Observable<any> {
    return this.http.put(`${api_url}/api/somemodels/${someModel.id}/upload`, {
        id: someModel.id,
        file: myFile
    });
}

Even after attempting to use FormData as suggested in the aforementioned post, where I added my forUpload File to a FormData, I am still facing the same error. Is there a way to resolve this issue without any specific media type configurations?

Answer №1

Great job on your code! A slight tweak to your controller could make it even better. You can simply add the FromForm attribute to your method parameters like this:

[HttpPut("{id}/upload")]
public async Task<IActionResult> UploadFile(string id, [FromForm] IFormFile file)  
{
    // your code goes here
}

While the suggestion to use FormData from the previous answer is good, I recommend making only a small addition to your setFile() method in typescript:

forUpload: File = null;
@Input() someModel: SomeModel;

save() {

    const addFileFnc = this.theService.addFile.bind(this.theService);

    const formdata = new FormData();
    formdata.append("id", this.someModel.id);
    formdata.append("file", this.forUpload);

    addFileFnc(formdata).subscribe(
        () => { this.ref.close(); },
        (e) => { console.log(e); }
    );
}

Instead of passing the entire someModel object, I noticed that only someModel.id is used in your service, so I simplified it to just that:

addFile(formdata: FormData): Observable<any> {
    return this.http.put(`${api_url}/api/somemodels/${formdata.get("id")}/upload`, formdata);
}

Your Error 400 Bad Request (as discussed here) could be due to sending a JSONified version of formdata instead of the actual FormData object in your service method.

Answer №2

If you're looking to upload a file in ASP.Net Core and Angular, here's a helpful guide.

On the Angular side, utilize FormData to submit the data:

const formData = new FormData();
formData.append("SomeProp", "somestring");
formData.append("Image", myFile); // adjust code as needed

return this.http.put(`${api_url}/api/somemodels/${someModel.id}/upload`, {
    formData
});

For the server side, define a PostViewModel class:

public class PostViewModel
{
    public string SomeProp { get; set; }
    public IFormFile Image { get; set; }
}

In the controller, use the FromForm attribute:

public async Task<IActionResult> SavePost([FromForm]PostViewModel viewModel)

Additionally, ensure CORS support is enabled in ASP.Net Core:

Enabling CORS:

public void ConfigureServices(IServiceCollection services)
{
      services.AddCors();
      services.AddMvc();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    app.UseCors(
        options => options.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader()
    );

    app.UseMvc();
}

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