为什么文件上传没有绑定到我的视图模型?

Why aren't file uploads binding to my viewmodel?

我正在尝试将文件上传绑定到 ViewModel(如 this post 中所示)。

但是我无法让文件绑定到 ViewModel 上的 Files 属性。

请看下面的代码。我做错了什么?

(为清楚起见进行编辑 - 我希望上传绑定到虚拟机,而不是将它们作为操作参数。)

ViewModel

public class PrimaryImageUploadViewModel
{
    public PrimaryImageUploadViewModel()
    {
    }

    public HttpPostedFileBase[] Files { get; set; }
    public string Title { get; set; }
}

动作

[HttpPost]
public async Task<ActionResult> Upload(PrimaryImageUploadViewModel postedModel)
{
    var requestFiles = postedModel.Files;  // THIS VALUE IS NULL - WHY?
    foreach (var f in requestFiles)
    {
        if (f.ContentLength == 0)
        {
            // do stuff
        }

    }
}

请求Headers

Accept:*/*
Content-Disposition:attachment; filename="MyImage.png"
Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryEj8zSF9hwGU3ZQA9
Origin:http://localhost:52588
Referer:http://localhost:52588/example/edit/1
User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36
X-Requested-With:XMLHttpRequest

请求负载

------WebKitFormBoundaryEj8zSF9hwGU3ZQA9
Content-Disposition: form-data; name="Title"

Some Test Title
------WebKitFormBoundaryEj8zSF9hwGU3ZQA9
Content-Disposition: form-data; name="files[]"; filename="MyImage.png"
Content-Type: image/png


------WebKitFormBoundaryEj8zSF9hwGU3ZQA9--

首先,如果您希望能够上传文件,请确保已将表单上的 enctype attribute 设置为 multipart/form-data

您可以在 post 操作参数中访问上传的文件,

[HttpPost]
public async Task<ActionResult> Upload(PrimaryImageUploadViewModel postedModel, HttpPostedFileBase file)
{
    if (file.ContentLength > 0)  
    {  
        string _FileName = Path.GetFileName(file.FileName);  
        string _path = Path.Combine(Server.MapPath("~/UploadedFilesFolder"), _FileName);  
        file.SaveAs(_path);  
    }            
}

 public class Model1
    {
        public HttpPostedFileBase[] Files { get; set; }
        public string Title { get; set; }
    }

希望这对您有所帮助...