FormData 未进入 API 控制器的 Post 方法

我正在尝试将文件从 Angular 5 应用程序发送到 .NET Core 2 中的 Web API 控制器，但我的模型始终为空。

如果我查看 chrome 工具，我会在请求中看到以下表单负载：

------WebKitFormBoundaryHbjYM4AKAkl6rQFo
Content-Disposition: form-data; name="quotationId"

4
------WebKitFormBoundaryHbjYM4AKAkl6rQFo
Content-Disposition: form-data; name="quotationFile"; filename="Analisis y Oferta E3M-v1.1.pdf"
Content-Type: application/pdf

------WebKitFormBoundaryHbjYM4AKAkl6rQFo--

角度POST：

  quotationFileUpload(files: FileList, quotationId: number) {
    if (files && files[0].size > 0) {
      const formData = new FormData();

      formData.append('quotationId', quotationId.toString());
      formData.append('quotationFile', files[0]);

      this.projectService.uploadQuotation(formData).subscribe(
        response => {
          this.alertService.success('Proyecto', 'Presupuesto subido correctamente.');
        },
        error => {
          this.alertService.error('Proyecto', error.error);
        }
      );
    }
  }

Angular 服务方式：

  public uploadQuotation(quotation: FormData) {
    return this.http.post(this.config.apiUrl + '/projects/quotations/file', quotation);
  }

.NET 代码：

/// <summary>
/// Upload a Quotation document.
/// </summary>
/// <param name="model"></param>
[HttpPost("quotations/file")]
[ProducesResponseType(200, Type = typeof(Quotation))]
[ProducesResponseType(400, Type = typeof(string))]
[ProducesResponseType(404, Type = typeof(string))]
[Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme)]
public async Task<ActionResult> UploadQuotation([FromForm] QuotationUploadViewModel model)
{
    try
    {
        var quotation = await _context.Quotations
                                      .AsNoTracking()
                                      .SingleOrDefaultAsync(c => c.QuotationId == System.Convert.ToInt32(model.QuotationId));

        if (quotation == null)
        {
            return NotFound($"Presupuesto con Id {model.QuotationId} no encontrado.");
        }

        _context.Quotations.Update(quotation);

        // Save file
        var filePath = Path.Combine(_hostingEnvironment.ContentRootPath, @"Uploads", model.QuotationFile.FileName);

        using (var stream = new FileStream(filePath, FileMode.Create))
        {
            await model.QuotationFile.CopyToAsync(stream);
        }

        quotation.FileName = model.QuotationFile.FileName;
        await _context.SaveChangesAsync();

        return Ok(quotation);
    }
    catch (System.Exception ex)
    {
        _errorResponseMsg = $"No se pudo subir el Presupuesto {model.QuotationId}: {ex.Message}";
        _logger.LogError(_errorResponseMsg);
    }

    return BadRequest(_errorResponseMsg);
}

报价上传查看模型

using Microsoft.AspNetCore.Http;

namespace E3m.Api.ViewModels.E3m
{
    public class QuotationUploadViewModel
    {
        public string QuotationId { get; set; }
        public IFormFile QuotationFile { get; set; }
    }
}

使用此代码，web api 方法中的模型属性始终为空。

关于这个问题的任何想法？问候