为什么IEnumerable的＆LT; HttpPostedFileBase＆GT;计数为1当我上传0文件？ [英] Why IEnumerable<HttpPostedFileBase> count is 1 when I upload 0 files?

问题描述

我有多个上传的形式，我想检查是否有任何文件，当我启动上传。这里是我的code。

查看：

  @using（Html.BeginForm（上传，家，FormMethod.Post，
                       新{ENCTYPE =的multipart / form-data的}））
{
    ＆LT;输入名字=文件类型=文件多个=多​​/＆GT;
    ＆LT;输入类型=提交值=上传/＆GT;
}
 

控制器：

  [HttpPost]
公众的ActionResult上传（IEnumerable的＆LT; HttpPostedFileBase＆GT;文件）
{
    如果（files.Count（）＆0）Console.WriteLine（files.Count（））; //显示1
    如果（files.Any（））Console.WriteLine（files.Any（））; //显示真
    如果（files.First（）== NULL）Console.WriteLine（第一空）; //显示第一个空    返回查看（）;
}
 

为什么我的程序显示效果一样，当我提出一个空的形式？
我可能会用JS我场检查，但我想了解什么是我的的IEnumerable＆LT这些数据; HttpPostedFileBase＆GT; 。谢谢你。

解决方案

虽然我有点晚了党，但仍。
我有一个同样的问题。发现asp.net的文章，他们说，它的设计。
HTTP：//aspnetwebstack.$c$cplex.com/workitem/188

  

这是设计使然，因为请求包含有文件名=那段。如果你不希望有创建的文件，请删除该请求段。
  我通过以下方式固定它。

 如果（RelatedFiles.Any（））
            {
                的foreach（在RelatedFiles var文件）
                {
                    如果（文件！= NULL）//这里只是检查空值。
                    {
                        字节[] = UploadedFile的新的字节[file.InputStream.Length]
                        file.InputStream.Read（UploadedFile的，0，file.ContentLength）;
                        FileInfo的网络连接=新的FileInfo（file.FileName）;                        VAR上传=新UploadedFile的
                        {
                            的ContentType = file.ContentType，
                            内容= UploadedFile的，
                            文件名= fi.Name，
                            ContentExtension = fi.Extension，
                        };                        newIssuePaper.RelatedDocuments.Add（上传）;
                    }
                }
 

I have a multiple upload form and I want to check if there is any files when I launch the upload. Here is my code.

View :

@using (Html.BeginForm("Upload", "Home", FormMethod.Post, 
                       new { enctype = "multipart/form-data"}))
{
    <input name="files" type="file" multiple="multiple" />
    <input type="submit" value="Upload" />
}

Controller :

[HttpPost]
public ActionResult Upload(IEnumerable<HttpPostedFileBase> files)
{
    if (files.Count() > 0) Console.WriteLine(files.Count()); // display 1
    if(files.Any()) Console.WriteLine(files.Any()); // display true
    if (files.First() == null) Console.WriteLine("first null"); // display "first null"

    return View();
}

Why my program display results like that when I submit an empty form ? I'll probably check with JS my field, but I want to understand what is these data in my IEnumerable<HttpPostedFileBase>. Thank you.

解决方案

Though i am a little late for the party but still. I had a same issue. Found an article on asp.net they said that its by design. http://aspnetwebstack.codeplex.com/workitem/188

This is by design because the request contains that segment which has filename="". If you don't want to have the file created, please remove that segment from the request. I fixed it via the following way.

 if (RelatedFiles.Any())
            {
                foreach (var file in RelatedFiles)
                {
                    if (file != null) // here is just check for a null value.
                    {


                        byte[] uploadedFile = new byte[file.InputStream.Length];
                        file.InputStream.Read(uploadedFile, 0, file.ContentLength);
                        FileInfo fi = new FileInfo(file.FileName);

                        var upload = new UploadedFile
                        {
                            ContentType = file.ContentType,
                            Content = uploadedFile,
                            FileName = fi.Name,
                            ContentExtension = fi.Extension,
                        };

                        newIssuePaper.RelatedDocuments.Add(upload);
                    }
                }

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