Question

我在razor 3和mvc 5下编码。

以下是我在视图中写的foreach：

@if (TempData["ImageNames"] != null)
{
    List<string> fileNames = (List<string>)TempData["ImageNames"];
    foreach (var fileName in fileNames.ToList())
    {
        <p>@fileName</p>
    }
}

列表不是空的，但没有打印。

可能出现什么问题？

更新

以下是完整的Html部分：

<div class="col-lg-6">
    <div class="panel panel-primary" style="min-height: 215px;">
        <div class="panel-heading">Upload File</div>
        <div class="panel-body">
            <form action="/document/upload" class="dropzone" id="my-awesome-dropzone" enctype="multipart/form-data" method="post">
            </form>
            <hr />
            @{List<string> fileNames = (List<string>)TempData["ImageNames"];}
            @if (TempData["ImageNames"] != null)
            {
                foreach (var fileName in fileNames.ToList())
                {
                    <p>@fileName</p>
                }
            }
        </div>
    </div> 
</div>

另一次更新

[HttpPost]
public ActionResult Upload(HttpPostedFileBase file)
{
    string fileName = Guid.NewGuid().ToString() + ".pdf";
    string path = Path.Combine(Server.MapPath("~/Files/Pdf/"), fileName);
    file.SaveAs(path);
    PdfReader reader = null;
    iTextSharp.text.Document document = null;
    PdfCopy pdfCopyProvider = null;
    PdfImportedPage importedPage = null;
    List<string> pdfNames = new List<string>();
    List<string> imageNames = new List<string>();
    try
    {
        reader = new PdfReader(path);
        for (int pageIndex = 1; pageIndex <= reader.NumberOfPages; pageIndex++)
        {
            string guid = Guid.NewGuid().ToString();
            string fileName1 = guid+ ".pdf";
            string fileName2 = guid + ".png";
            pdfNames.Add(fileName1);
            imageNames.Add(fileName2);
            string path1 = Path.Combine(Server.MapPath("~/Files/Pdf/temp/"), fileName1);
            document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(pageIndex));
            pdfCopyProvider = new PdfCopy(document,new System.IO.FileStream(path1, System.IO.FileMode.Create));
            document.Open();
            importedPage = pdfCopyProvider.GetImportedPage(reader, pageIndex);
            iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(importedPage);
            pdfCopyProvider.AddPage(importedPage);
            document.Close();
            PDFDocument pdfDoc = new PDFDocument();
            pdfDoc.LoadPDF(path1);
            Bitmap pngImage = pdfDoc.ToImage(0);
            string path2 = Path.Combine(Server.MapPath("~/Images/Pdf/temp/"), fileName2);
            pngImage.Save(path2, ImageFormat.Png);
        }
        reader.Close();
    }
    catch (Exception ex)
    {
        throw ex;
    }
    TempData["ImageNames"] = imageNames;
    return RedirectToAction("index");
}

Answer 1

可能是我的语法会有点错误，因为我无法在这里打开visual studio，但据我所知，为了显示UI中的变量，你需要put＆＃34;：＆＃34;在你的变量之前。所以代码将是这样的：

@if (TempData["ImageNames"] != null)
{
   List<string> fileNames = (List<string>)TempData["ImageNames"];
   foreach (var fileName in fileNames.ToList())
   {
      <p>@:fileName</p>
   }
}

Answer 2

幽默我，试着去做：

@{
    if (TempData["ImageNames"] != null) {
        List<string> fileNames = (List<string>)TempData["ImageNames"];
        foreach (var fileName in fileNames)
        {
            <p>@Html.Raw(fileName)</p>
        }
    }
}

Answer 3

<text>@fileName</text>，请使用此功能，我希望它能正常工作。

我的剃刀怎么了？

3 个答案: