如何将名为 "file[]" 的发布数据绑定到 MVC 模型?

How to bind posted data named "file[]" to an MVC model?

我正在使用 Redactor as an HTML editor, which has a component for uploading images and files

Redactor 负责客户端位,我需要提供服务器端上传功能。

如果我在控制器中使用 Request.Files,我可以毫无问题地进行上传。

但我想将发布的文件绑定到一个模型,但我似乎无法做到这一点,因为它们发送的参数是 files[] - 名称中带有方括号。

我的问题:

是否可以将发布的 "file[]" 绑定到 MVC 模型?这是一个无效的 属性 名称,单独使用 file 是行不通的。


这个文件输入看起来像这样。我可以指定 file 以外的名称,但 Redactor 会在末尾添加 [],而不管名称是什么。

<input type="file" name="file" multiple="multiple" style="display: none;">

我正在尝试像这样绑定到 属性:

public HttpPostedFileBase[] File { get; set; }

当我观看上传时,我在请求中看到了这一点(我推测编辑者可能在幕后添加了方括号):

Content-Disposition: form-data; name="file[]"; filename="my-image.jpg"

也相关:

Redactor always sends the uploading request with content-type as multipart/form-data. So you don't need to add this enctype anywhere

您应该创建一个自定义模型活页夹以将上传的文件绑定到一个 属性。 首先创建一个模型 HttpPostedFileBase[] 属性

public class RactorModel
{
    public HttpPostedFileBase[] Files { get; set; }
}

然后实施 DefaultModelBinder 并覆盖 BindProperty

public class RactorModelBinder : DefaultModelBinder
{
    protected override void BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor)
    {
        int len = controllerContext.HttpContext.Request.Files.AllKeys.Length;

        if (len > 0)
        {
            if (propertyDescriptor.PropertyType == typeof(HttpPostedFileBase[]))
            {
                string formName = string.Format("{0}[]", propertyDescriptor.Name);
                HttpPostedFileBase[] files = new HttpPostedFileBase[len];
                for (int i = 0; i < len; i++)
                {
                    files[i] = controllerContext.HttpContext.Request.Files[i];
                }

                propertyDescriptor.SetValue(bindingContext.Model, files);
                return;
            }
        }

        base.BindProperty(controllerContext, bindingContext, propertyDescriptor);
    }
}

您还应该将活页夹提供程序添加到您的项目中,然后在 global.asax

中注册它
public class RactorModenBinderProvider : IModelBinderProvider
{
    public IModelBinder GetBinder(Type modelType)
    {
        if (modelType == typeof(RactorModel))
        {
            return new RactorModelBinder();
        }

        return null;
    }
}
...
ModelBinderProviders.BinderProviders.Insert(0, new RactorModenBinderProvider());

这不是一个通用的解决方案,但我想您明白了。

我在 ASP.NET MVC 项目中集成 jQuery.filer 时遇到了类似的问题。由于 jQuery.filer 将“[]”添加到输入的名称属性的末尾(即从文件到文件[]),我不得不手动更改名称属性的值,如下所示:

$('#FileUpload').attr('name', 'FileUpload');

这是我在 AJAX 的一些项目中使用的方法,并且没有任何问题。您可以尝试一下,如果有效请告诉我:

ViewModel:

[Display(Name = "Attachments")]
[DataType(DataType.Upload)]
public IEnumerable<HttpPostedFileBase> FileUpload { get; set; }


查看:

@model ViewModel

@using (Html.BeginForm("Insert", "Controller", FormMethod.Post, 
    new { id = "frmCreate", enctype = "multipart/form-data" })) 
{   
    @Html.TextBoxFor(m => m.FileUpload, new { type = "file", multiple = "multiple" })
    <button id="btnSubmit" onclick="insert(event)" type="button">Save</button>
}    

<script>     
function insert(event) {     
    event.preventDefault();

    //As jQuery.filer adds "[]" to the end of name attribute of input (i.e. from files to files[])
    //we have to change the value of name attribute manually
    $('#FileUpload').attr('name', 'FileUpload');        
    var formdata = new FormData($('#frmCreate').get(0)); 

    $.ajax({
        type: "POST",
        url: '@Url.Action("Insert", "Cotroller")',
        cache: false,
        dataType: "json",
        data: formdata,

        /* If you are uploading files, then processData and contentType must be set 
        to falsein order for FormData to work (otherwise comment out both of them) */
        processData: false, 
        contentType: false, 

        success: function (response, textStatus, XMLHttpRequest) {
            //...
        }
    });
};

$(document).ready(function () {         
    $('#FileUpload').filer({        
        //code omitted for brevity
    });  
});  
</script>


控制器:

public JsonResult Insert([Bind(Exclude = null)] ViewModel model)
{
    if (ModelState.IsValid)
    {   
        List<FileAttachment> fa = new List<FileAttachment>();
        if (model.FileUpload != null)
        {
            FileAttachment fileAttachment = new FileAttachment //entity model
            {
                Created = DateTime.Now,
                FileMimeType = upload.ContentType,
                FileData = new byte[upload.ContentLength],
                FileName = upload.FileName,
                AuthorId = 1
            };
            upload.InputStream.Read(fileAttachment.FileData, 0, upload.ContentLength);
            fa.Add(fileAttachment);
        }

        //code omitted for brevity
        repository.SaveExperimentWithAttachment(model, fa);
        return Json(new { success = true, message = "Record has been created." });
    }
    // If we got this far, something failed, redisplay form
    return Json(new { success = false, message = "Please check the form and try again." });
}

希望这对您有所帮助...