Angular 前端/C# API 后端 - 在同一篇文章中发布 FormData（文件）和对象

Question

希望有人可以帮助我了解将文件（FormData）和对象从 Angular 上传到 C# API 的过程。据我了解，HttpClient Post 方法仅接受一个主体参数，因此我可以发布 FormData 对象或“SomeObject”对象，但不能同时发布两者。我尝试在 FormData 中封装“SomeObject”（使用 FormData.append），但没有成功。

Angular 前端代码片段：

uploadAttachment(abcId: number, someObject: SomeObject)
{
  const url = this.apiUrl + '/abc/' + abcId;

  const formData = new FormData();
  formData.append('file', fileData);

  return this.http.post<ScopeItemAttachment>(url, formData, 
  {
    reportProgress: true,
    observe: 'events'
  });
}

C# API 片段：

[HttpPost("{abcID}", Name = "UploadAttachment")]
public IActionResult UploadAttachment(int abcId, SomeObject someObject)
{
    try
    {
        var file = Request.Form.Files[0];
        var temp = Request.Form.Keys;

        if (file.Length > 0)
        {
            fileName = ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');

            MemoryStream ms = new MemoryStream();
            file.CopyTo(ms);

            ms.Close();
            ms.Dispose();

            return Ok();
        }
        else
            return BadRequest(new { message = "File content length must be greater than zero" });
    }
    catch (Exception ex)
    {
        return StatusCode(500, $"Internal server error: {ex}");
    }
}

Answer 1

假设您的

SomeObject

实现如下：

public class SomeObject
{
    public IFormFile File { get; set; }
}

1. 将

   [FromForm]

   属性应用于请求正文 (

   someObject

   )。

2. 您可以通过

   file

   而不是

   someObject.File

   获得

   Request.Form.File[0]

   。

[HttpPost("{abcId}", Name = "UploadAttachment")]
public IActionResult UploadAttachment(int abcId, [FromForm] SomeObject someObject)
{

    var file = someObject.File;

    ...
}