Ajax上傳幫手在asp.net mvc 5沒有工作，並得到空值

Question

我想要使用Razor engineasp.net mvc 5使用Upload control保存圖像。這些是我的代碼下面，我認爲每一件事情都可以，但我不知道爲什麼UploadImage在controller得到空，並沒有得到選定的圖像。請任何人幫助我嗎？

管理控制器

根據文章我在控制器參數使用相同的名稱@html.upload("UploadImage")。

[HttpPost] 
    public ActionResult AddSubGood(SubGood subgood, HttpPostedFileBase UploadImage) 
    { 
     var MainGoodId = subgood.FKMainGoodID; 
     SubGoodRepositories blSubGood = new SubGoodRepositories(); 
     if (ModelState.IsValid) 
     { 
      subgood.FKMainGoodID = MainGoodId; 
      if (blSubGood.Add(subgood)) 
      { 
       return MessageBox.Show("added successfully", MessageType.Success); 
      } 
      else 
      { 
       return MessageBox.Show(" didn't add", MessageType.Error); 
      } 
     } 
     else 
     { 
      return MessageBox.Show(ModelState.GetErrors(), MessageType.Warning); 
     } 

    } 

AddSubGood.cshtml

根據文章中，我添加enctype="multipart/form-data"到form

@using (Ajax.BeginForm("Admin", "AddSubGood", new AjaxOptions { HttpMethod = "Post", Url = "/Admin/AddSubGood" }, new{enctype="multipart/form-data" })) 
{ 
@Html.AntiForgeryToken() 
<div class="form-group"> 
      <div class="form-group"> 
       <div class="col-md-10"> 
        @Html.Upload("UploadImage") 
        @Html.ValidationMessageFor(model => model.SubGoodURL) 
       </div> 
      @Html.LabelFor(model => model.SubGoodURL, new { @class = "control-label col-md-2" }) 
    </div> 
} 

UploadHelper.cs

public static class UploadHelper 
    { 
    public static MvcHtmlString Upload(this HtmlHelper helper, string name, object htmlAttributes = null) 
    { 
    TagBuilder input = new TagBuilder("input"); 
    input.Attributes.Add("type", "file"); 
    input.Attributes.Add("id", helper.ViewData.TemplateInfo.GetFullHtmlFieldId(name)); 
    input.Attributes.Add("name", helper.ViewData.TemplateInfo.GetFullHtmlFieldName(name)); 

    if (htmlAttributes != null) 
    { 
     var attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes); 
     input.MergeAttributes(attributes); 
    } 

    return new MvcHtmlString(input.ToString()); 
} 

public static MvcHtmlString UploadFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, object htmlAttributes = null) 
{ 
    //helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression)) 
    var data = ModelMetadata.FromLambdaExpression(expression, helper.ViewData); 
    TagBuilder input = new TagBuilder("input"); 
    input.Attributes.Add("type", "file"); 
    input.Attributes.Add("id", helper.ViewData.TemplateInfo.GetFullHtmlFieldId(ExpressionHelper.GetExpressionText(expression))); 
    input.Attributes.Add("name", helper.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression))); 

    if (htmlAttributes != null) 
    { 
     var attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes); 
     input.MergeAttributes(attributes); 
    } 

    return new MvcHtmlString(input.ToString()); 
    } 
} 

Answer 1

它不支持上傳使用Ajax.BeginForm文件。如果您使用Html.BeginForm，它將起作用。如果你使用ajax發佈，你可以使用一些文件上傳插件，如dropzonejs或Blueimp File Upload。