在 mvc5 asp.net 找不到视图"删除"或其主节点

Question

我希望能够上传文件，然后下载或删除它。但是当我尝试删除它时，出现此错误：

未找到视图"删除"或其主视图，或者没有视图引擎支持搜索的位置。搜索了以下位置：

~/views/FileUpload/Delete.aspx ，~/Views/FileUpload/Delete.ascx， ~/Views/Shared/Delete.aspx，~/Views/Shared/Delete.ascx， ~/Views/FileUpload/Delete.cshtml， ~/Views/FileUpload/Delete.vbhtml， ~/Views/Shared/Delete.cshtml ，~/Views/Shared/Delete.vbhtml .

[HttpGet]
public ActionResult Delete( string deletedfile)
{
string current_usr = User.Identity.GetUserId();

string fullPath = Request.MapPath("~/Files/" + current_usr + "/" + deletedfile);
if (System.IO.File.Exists(fullPath))
{
System.IO.File.Delete(fullPath);
ViewBag.Message="Deleted";
}
var items = GetFiles();
return View(items);
}
// GET: FileUpload
public ActionResult Index()
{
var items = GetFiles();
return View(items);
}
// POST: FileUpload
[HttpPost]
public ActionResult Index(HttpPostedFileBase file)
{
if (file != null && file.ContentLength > 0)
try
{
string current_usr = User.Identity.GetUserId();

//string path = Path.Combine(Server.MapPath("~/Files/"),
//    Path.GetFileName(file.FileName));
var folder = Server.MapPath("~/Files/" + current_usr + "/");
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
string path = Path.Combine(String.Format(folder),
Path.GetFileName(file.FileName));
file.SaveAs(path);
ViewBag.Message = "File uploaded successfully";
}
catch (Exception ex)
{
ViewBag.Message = "ERROR:" + ex.Message.ToString();
}
else
{
ViewBag.Message = "You have not specified a file.";
}
var items = GetFiles();
return View(items);
}

public FileResult Download(string downloadedfile)
{
string current_usr = User.Identity.GetUserId();
var FileVirtualPath = "~/Files/" + current_usr + "/" + downloadedfile;
return File(FileVirtualPath, "application/force-download", Path.GetFileName(FileVirtualPath));
}

private List<string> GetFiles()
{
string current_usr = User.Identity.GetUserId();

var dir = new System.IO.DirectoryInfo(Server.MapPath("~/Files/" + current_usr + "/"));
System.IO.FileInfo[] fileNames = dir.GetFiles("*.*");
List<string> items = new List<string>();
foreach (var file in fileNames)
{
items.Add(file.Name);
}
return items;
}

观点 ：

<h2> File Upload </h2>
@model List<string>
@using (Html.BeginForm("Index", "FileUpload", FormMethod.Post,
new { enctype = "multipart/form-data" }))
{

<label for="file"> Upload </label>
<input type="file" name="file" id="file" />
<br /><br />
<input type="submit" value="Upload" />
<br /><br />
@ViewBag.Message
<br />
<h2>Documents list</h2>
<table style="width:100%">
<tr>
<th> File Name </th>
<th> Link  </th>
</tr>
@for (var i = 0; i <= (Model.Count) - 1; i++)
{
<tr>
<td>@Model[i].ToString() </td>
<td>@Html.ActionLink("Download", "Download", new { downloadedfile = Model[i].ToString() }) </td>
<td>

@Html.ActionLink("Delete", "Delete", new { deletedfile = Model[i].ToString() }) 
</td>

</tr>
}

</table>
}

Answer 1

问题是您的删除控制器方法在最后调用 View((。该方法将尝试查找具有控制器方法名称的视图文件。如果要在删除后显示文件列表，可以重定向到索引操作，如下所示：

[HttpGet]
public ActionResult Delete(string deletedfile)
{
string current_usr = User.Identity.GetUserId();
string fullPath = Request.MapPath("~/Files/" + current_usr + "/" + deletedfile);
if (System.IO.File.Exists(fullPath))
{
System.IO.File.Delete(fullPath);
ViewBag.Message = "Deleted";
}
return RedirectToAction("Index");
}

有关重定向的更多详细信息，请参阅微软文档中的此链接

https://learn.microsoft.com/en-us/aspnet/mvc/overview/older-versions-1/views/asp-net-mvc-views-overview-cs