2012-10-15 50 views
1

无论我尝试什么,我的后期图像始终为空或未将对象引用设置为对象的实例。MVC 4 HttpPostedFileBase始终为空

我有一个post类和图像类映射到表(使用EF代码第一)

这里是我的代码:

查看:

<h2>Create</h2> 
@using (Html.BeginForm("Create", "Admin", FormMethod.Post, new{ enctype =   "multipart/form-data" })) 
{ 

@Html.ValidationSummary(true) 

@Html.LabelFor(post => post.Post.Blog) 
@Html.DropDownListFor(post => post.Post.BlogId, Model.BlogList) 
@Html.LabelFor(post => post.Post.Category) 
@Html.DropDownListFor(post => post.Post.CategoryId, Model.CategoryList) 

@Html.LabelFor(post => post.Post.Title) 
@Html.EditorFor(post => post.Post.Title) 
<br /> 


@Html.LabelFor(post => post.Post.Content) 
@Html.EditorFor(post => post.Post.Content) 
    <br /> 
<input type="file" name="uploadImage" value="Upload" /> 
<input type="submit" value="Create" /> 
} 

操作方法:

[HttpPost] 
    public ActionResult Create(Post post, HttpPostedFileBase image) 
    { 

     if (ModelState.IsValid) 
     { 
      var postBlog = _repository.Blogs.Single(b => b.BlogId == post.BlogId); 
      post.Created = DateTime.Now; 
      postBlog.Posts.Add(post); 



       PostImage newImage = new PostImage() 
             { 
              MimeType = image.ContentType, 
              ImageData = new byte[image.ContentLength], 
              PostId = post.PostId 
             }; 
       _repository.AddImage(newImage); 



      _repository.Save(); 
      return RedirectToAction("Index"); 

     } 

回答

3

Doh!问题是我已经在输入元素中设置了'value',你只需要输入type =“file”name =“Image”/>以便正确绑定