我是Visual Studio MVC4 C＃的初学者。我想获取上传文件，然后列出文件并为每个文件添加一个按钮，以允许用户将文件保存在他们的计算机中。
这是我的模特：
public class UploadDocModel
{
private System.IO.FileInfo file;
public int Id { get; set; }
public string UserName { get; set; }
public string Path { get; set; }
public string FileName { get; set; }
public DateTime Date { get; set; }
//add constructor
public UploadDocModel() { }
public UploadDocModel(int _Id, string _FileName)
{
this.Id = _Id;
this.FileName = _FileName;
}
public UploadDocModel(System.IO.FileInfo file)
{
// TODO: Complete member initialization
this.file = file;
}
}
这是我的控制器
public class UploadController : Controller
{
public ActionResult UploadDownloadFiles()
{
try
{
List<UploadDocModel> ContentFiles = new List<UploadDocModel>();
List<FileInfo> files = this.DirectoryFileList;
foreach (FileInfo file in files)
{
UploadDocModel _UploadDocModel = new UploadDocModel(file);
if (_UploadDocModel != null) ContentFiles.Add(_UploadDocModel);
}
return View(ContentFiles);
}
catch
{
return RedirectToAction("ConnectionError", "Home");
}
}
public ActionResult FileUpload()
{
return View();
}
[HttpPost]
public ActionResult FileUpload(HttpPostedFileBase file)
{
if (ModelState.IsValid)
{
if (file == null)
{
ModelState.AddModelError("File", "Please Upload Your file");
}
else if (file.ContentLength > 0)
{
int MaxContentLength = 1024 * 1024 * 3; //3 MB
string[] AllowedFileExtensions = new string[] { ".jpg", ".gif", ".png", ".pdf" };
if (!AllowedFileExtensions.Contains(file.FileName.Substring(file.FileName.LastIndexOf('.'))))
{
ModelState.AddModelError("File", "Please file of type: " + string.Join(", ", AllowedFileExtensions));
}
else if (file.ContentLength > MaxContentLength)
{
ModelState.AddModelError("File", "Your file is too large, maximum allowed size is: " + MaxContentLength + " MB");
}
else
{
//TO:DO
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/App_Data/Upload"), fileName);
file.SaveAs(path);
//return View((object)path);
ModelState.Clear();
ViewBag.Message = "File uploaded successfully";
}
}
}
return RedirectToAction("UploadDownloadFiles", "Upload");
}
public ActionResult Download(string fn)
{
try
{
return new DownloadResult { VirtualPath = "~/App_Data/Upload" + fn, FileDownloadName = fn };
}
catch
{
return RedirectToAction("ConnectionError", "Home");
}
}
public List<FileInfo> DirectoryFileList
{
get
{
DirectoryInfo directory = new DirectoryInfo(Path.Combine(HttpRuntime.AppDomainAppPath, "~/App_Data/Upload"));
return directory.GetFiles().ToList<FileInfo>();
}
}
}
This is my Download Result Class
public class DownloadResult : ActionResult
{
public DownloadResult()
{
}
public DownloadResult(string virtualPath)
{
this.VirtualPath = virtualPath;
}
public string VirtualPath { get; set; }
public string FileDownloadName { get; set; }
public override void ExecuteResult(ControllerContext context)
{
try
{
if (!String.IsNullOrEmpty(FileDownloadName))
{
context.HttpContext.Response.AddHeader("content-disposition",
"attachment; filename=" + this.FileDownloadName);
}
string filePath = context.HttpContext.Server.MapPath(this.VirtualPath);
context.HttpContext.Response.TransmitFile(filePath);
}
catch
{
}
}
}
这是我的上传文件视图：
@{
ViewBag.Title = " File Upload";
}
<script src="../../Scripts/jquery-1.7.1.min.js" type="text/javascript"></script>
<script src="../../Scripts/jquery.validate.min.js" type="text/javascript"></script>
<script src="../../Scripts/jquery.validate.unobtrusive.min.js" type="text/javascript"></script>
<script type="text/jscript">
//get file size
function GetFileSize(fileid) {
try {
var fileSize = 0;
//for IE
if ($.browser.msie) {
//before making an object of ActiveXObject,
//please make sure ActiveX is enabled in your IE browser
var objFSO = new ActiveXObject("Scripting.FileSystemObject"); var filePath = $("#" + fileid)[0].value;
var objFile = objFSO.getFile(filePath);
var fileSize = objFile.size; //size in kb
fileSize = fileSize / 1048576; //size in mb
}
//for FF, Safari, Opeara and Others
else {
fileSize = $("#" + fileid)[0].files[0].size //size in kb
fileSize = fileSize / 1048576; //size in mb
}
// alert("Uploaded File Size is" + fileSize + "MB");
return fileSize;
}
catch (e) {
alert("Error is :" + e);
}
}
//get file path from client system
function getNameFromPath(strFilepath) {
var objRE = new RegExp(/([^\/\\]+)$/);
var strName = objRE.exec(strFilepath);
if (strName == null) {
return null;
}
else {
return strName[0];
}
}
$("#btnSubmit").live("click", function () {
if ($('#fileToUpload').val() == "") {
$("#spanfile").html("Please upload file");
return false;
}
else {
return checkfile();
}
});
function checkfile() {
var file = getNameFromPath($("#fileToUpload").val());
if (file != null) {
var extension = file.substr((file.lastIndexOf('.') + 1));
// alert(extension);
switch (extension) {
case 'jpg':
case 'png':
case 'gif':
case 'pdf':
flag = true;
break;
default:
flag = false;
}
}
if (flag == false) {
$("#spanfile").text("You can upload only jpg,png,gif,pdf extension file");
return false;
}
else {
var size = GetFileSize('fileToUpload');
if (size > 3) {
$("#spanfile").text("You can upload file up to 3 MB");
return false;
}
else {
$("#spanfile").text("");
}
}
}
$(function () {
$("#fileToUpload").change(function () {
checkfile();
});
});
</script>
<h2>Upload File</h2>
<h3 style="color:green">@ViewBag.Message</h3>
@using (Html.BeginForm("FileUpload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.ValidationSummary();
<fieldset>
<legend>Registration Form</legend>
<ol>
<li class="lifile">
<input type="file" id="fileToUpload" name="file" />
<span class="field-validation-error" id="spanfile"></span>
</li>
</ol>
<input type="submit" id="btnSubmit" value="Upload" />
</fieldset>
}
现在我的问题是，我收到了这个错误：
类型＆＃39; System.IO.DirectoryNotFoundException＆＃39;的例外情况发生了 在mscorlib.dll中但未在用户代码中处理 信息：找不到路径的一部分 ＆＃39; C：\用户\阿比尔\桌面\ Watheq \ Watheq \程序App_Data \上传\ 20131220_130423.jpg＆＃39;
我不知道如何显示上传的文件并下载它们。
感谢您的帮助。
答案 0 :(得分：0)
可能是权限问题，请将项目复制到桌面以外的其他位置，然后尝试。
答案 1 :(得分：0)
IIS的权限问题通常表明它没有访问权限，而不是无法找到该文件。
当您尝试保存目录不存在的文件时，您会看到该错误。在您的代码中，您只是写入文件夹，但不检查目录是否存在。见下文。
if (!Directory.Exists(Server.MapPath("~/App_Data/Upload")))
{
Directory.CreateDirectory(Server.MapPath("~/App_Data/Upload"));
}
file.SaveAs(path);