ASP.NET MVC 5 httpPostedFileBase在模型中始终为空

我正在尝试向服务器发送几个有额外字段的文件。

这是我的模型

// PreOrderInput contains some fields that getting populated correctly
public class PreOrderInputModel : PreOrderInput
{
    public new List<FileInputModel> Files { get; set; }
}

public class FileInputModel
{
    public HttpPostedFileBase FileContent { get; set; }
    public string FileName { get; set; }
    public DocumentTypeCodes DocumentTypeCode { get; set; }
}

这是vue.js应用程序准备表单数据的一部分

getFormData()
{
    var data = new FormData()

    data.append("LegalData[ProfileTypeCode]", this.model.type)
    data.append("LegalData[Inn]", this.model.inn)
    data.append("LegalData[OrganisationName]", this.model.organization)
    data.append("LegalData[Email]", this.model.email)
    data.append("Files[0][FileName]", this.model.files.passport.name)
    data.append("Files[0][FileContent]", this.model.files.passport.file)
    data.append("Files[0][DocumentTypeCode]", this.documentTypeCode.SNILS)

    return data
},

应用程序发布以下数据(示例)

mimeType: multipart/form-data; boundary=----WebKitFormBoundaryUTk0Jj2CJJCLZOYm

------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="LegalData[ProfileTypeCode]"

null
------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="LegalData[Inn]"

null
------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="LegalData[OrganisationName]"

null
------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="LegalData[Email]"

null
------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="Files[0][FileName]"

AdmittedSkzi.xlsx
------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="Files[0][FileContent]"; filename="AdmittedSkzi.xlsx"
Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet


------WebKitFormBoundaryUTk0Jj2CJJCLZOYm
Content-Disposition: form-data; name="Files[0][DocumentTypeCode]"

11
------WebKitFormBoundaryUTk0Jj2CJJCLZOYm--

我是管制员

[HttpPost]
public ActionResult CreatePreOrder(PreOrderInputModel preOrderInput)
{
    preOrderInput.CreatorLogin = UserLogin;
    return Json(_customerPreOrderService.CreatePreOrder(UserLogin, preOrderInput));
}

尽管request.files包含已发布的文件数据,但preorderinput.files[0].filecontent为空。

我错过重要的东西了吗?