c# - tutorial - razor mvc




文件上传ASP.NET MVC 3.0 (12)

In Controller

 if (MyModal.ImageFile != null)
                    {
                        MyModal.ImageURL = string.Format("{0}.{1}", Guid.NewGuid().ToString(), MyModal.ImageFile.FileName.Split('.').LastOrDefault());
                        if (MyModal.ImageFile != null)
                        {
                            var path = Path.Combine(Server.MapPath("~/Content/uploads/"), MyModal.ImageURL);
                            MyModal.ImageFile.SaveAs(path);
                        }
                    }

In View

<input type="hidden" value="" name="..."><input id="ImageFile" type="file" name="ImageFile" src="@Model.ImageURL">

In Modal Class

 public HttpPostedFileBase ImageFile { get; set; }

Create a folder as uploads in Content folder in project

我想在asp.net-mvc上传文件。 我如何使用html input file控件上传input file


Checkout my solution

public string SaveFile(HttpPostedFileBase uploadfile, string saveInDirectory="/", List<string> acceptedExtention =null)
{
    acceptedExtention = acceptedExtention ?? new List<String>() {".png", ".Jpeg"};//optional arguments

    var extension = Path.GetExtension(uploadfile.FileName).ToLower();

    if (!acceptedExtention.Contains(extension))
    {
        throw new UserFriendlyException("Unsupported File type");
    }
    var tempPath = GenerateDocumentPath(uploadfile.FileName, saveInDirectory);
    FileHelper.DeleteIfExists(tempPath);
    uploadfile.SaveAs(tempPath);

    var fileName = Path.GetFileName(tempPath);
    return fileName;
}

private string GenerateDocumentPath(string fileName, string saveInDirectory)
{
    System.IO.Directory.CreateDirectory(Server.MapPath($"~/{saveInDirectory}"));
    return Path.Combine(Server.MapPath($"~/{saveInDirectory}"), Path.GetFileNameWithoutExtension(fileName) +"_"+ DateTime.Now.Ticks + Path.GetExtension(fileName));
}

add these functions in your base controller so you can use them in all controllers

checkout how to use it

SaveFile(view.PassportPicture,acceptedExtention:new List<String>() { ".png", ".Jpeg"},saveInDirectory: "content/img/PassportPicture");

and here is a full example

[HttpPost]
public async Task<JsonResult> CreateUserThenGenerateToken(CreateUserViewModel view)
{// CreateUserViewModel contain two properties of type HttpPostedFileBase  
    string passportPicture = null, profilePicture = null;
    if (view.PassportPicture != null)
    {
        passportPicture = SaveFile(view.PassportPicture,acceptedExtention:new List<String>() { ".png", ".Jpeg"},saveInDirectory: "content/img/PassportPicture");
    }
    if (view.ProfilePicture != null)
    {
        profilePicture = SaveFile(yourHttpPostedFileBase, acceptedExtention: new List<String>() { ".png", ".Jpeg" }, saveInDirectory: "content/img/ProfilePicture");
    }
    var input = view.MapTo<CreateUserInput>();
    input.PassportPicture = passportPicture;
    input.ProfilePicture = profilePicture;


    var getUserOutput = await _userAppService.CreateUserThenGenerateToken(input);
    return new AbpJsonResult(getUserOutput);
    //return Json(new AjaxResponse() { Result = getUserOutput, Success = true });

}

Simple way to save multiple files

cshtml

@using (Html.BeginForm("Index","Home",FormMethod.Post,new { enctype = "multipart/form-data" }))
{
    <label for="file">Upload Files:</label>
    <input type="file" multiple name="files" id="files" /><br><br>
    <input type="submit" value="Upload Files" />
    <br><br>
    @ViewBag.Message
}

调节器

[HttpPost]
        public ActionResult Index(HttpPostedFileBase[] files)
        {
            foreach (HttpPostedFileBase file in files)
            {
                if (file != null && file.ContentLength > 0)
                    try
                    {
                        string path = Path.Combine(Server.MapPath("~/Files"), 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.";
                }
            }
            return View();
        }

Since i have found issue uploading file in IE browser i would suggest to handle it like this.

视图

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

调节器

public class HomeController : Controller
{
    public ActionResult UploadFile()
    {
        return View();
    }

    [HttpPost]
    public ActionResult UploadFile(MyModal Modal)
    {
            string DocumentName = string.Empty;
            string Description = string.Empty;

            if (!String.IsNullOrEmpty(Request.Form["DocumentName"].ToString()))
                DocumentName = Request.Form["DocumentName"].ToString();
            if (!String.IsNullOrEmpty(Request.Form["Description"].ToString()))
                Description = Request.Form["Description"].ToString();

            if (!String.IsNullOrEmpty(Request.Form["FileName"].ToString()))
                UploadedDocument = Request.Form["FileName"].ToString();

            HttpFileCollectionBase files = Request.Files;

            string filePath = Server.MapPath("~/Root/Documents/");
            if (!(Directory.Exists(filePath)))
                Directory.CreateDirectory(filePath);
            for (int i = 0; i < files.Count; i++)
            {
                HttpPostedFileBase file = files[i];
                // Checking for Internet Explorer  
                if (Request.Browser.Browser.ToUpper() == "IE" || Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")
                {
                    string[] testfiles = file.FileName.Split(new char[] { '\\' });
                    fname = testfiles[testfiles.Length - 1];
                    UploadedDocument = fname;
                }
                else
                {
                    fname = file.FileName;
                    UploadedDocument = file.FileName;
                }
                file.SaveAs(fname);
                return RedirectToAction("List", "Home");
}

在该视图中:

<form action="Categories/Upload" enctype="multipart/form-data" method="post">
    <input type="file" name="Image">
    <input type="submit" value="Save">
</form>

而控制器中的以下代码:

public ActionResult Upload()
{
    foreach (string file in Request.Files)
    {
       var hpf = this.Request.Files[file];
       if (hpf.ContentLength == 0)
       {
            continue;
       }

       string savedFileName = Path.Combine(
                AppDomain.CurrentDomain.BaseDirectory, "PutYourUploadDirectoryHere");
                savedFileName = Path.Combine(savedFileName, Path.GetFileName(hpf.FileName));

        hpf.SaveAs(savedFileName);
    }

    ...
}

您不使用文件输入控件。 服务器端控件不在ASP.NET MVC中使用。 签出以下博客文章 ,说明如何在ASP.NET MVC中实现此目的。

所以你可以从创建一个包含文件输入的HTML表单开始:

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

然后你将有一个控制器来处理上传:

public class HomeController : Controller
{
    // This action renders the form
    public ActionResult Index()
    {
        return View();
    }

    // This action handles the form POST and the upload
    [HttpPost]
    public ActionResult Index(HttpPostedFileBase file)
    {
        // Verify that the user selected a file
        if (file != null && file.ContentLength > 0) 
        {
            // extract only the filename
            var fileName = Path.GetFileName(file.FileName);
            // store the file inside ~/App_Data/uploads folder
            var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
            file.SaveAs(path);
        }
        // redirect back to the index action to show the form once again
        return RedirectToAction("Index");        
    }
}

我必须使用命令将文件上传到100 kb的文件块和最后的上传文件存储库中。 我希望它能帮助你。

    public HttpResponseMessage Post(AttachmentUploadForm form)
    {
        var response = new WebApiResultResponse
        {
            IsSuccess = true,
            RedirectRequired = false
        };

        var tempFilesFolder = Sanelib.Common.SystemSettings.Globals.CreateOrGetCustomPath("Temp\\" + form.FileId);

        File.WriteAllText(tempFilesFolder + "\\" + form.ChunkNumber + ".temp", form.ChunkData);

        if (form.ChunkNumber < Math.Ceiling((double)form.Size / 102400)) return Content(response);

        var folderInfo = new DirectoryInfo(tempFilesFolder);
        var totalFiles = folderInfo.GetFiles().Length;

        var sb = new StringBuilder();

        for (var i = 1; i <= totalFiles; i++)
        {
            sb.Append(File.ReadAllText(tempFilesFolder + "\\" + i + ".temp"));
        }

        var base64 = sb.ToString();
        base64 = base64.Substring(base64.IndexOf(',') + 1);
        var fileBytes = Convert.FromBase64String(base64);
        var fileStream = new FileStream(tempFilesFolder + "\\" + form.Name, FileMode.OpenOrCreate, FileAccess.ReadWrite);
        fileStream.Seek(fileStream.Length, SeekOrigin.Begin);
        fileStream.Write(fileBytes, 0, fileBytes.Length);
        fileStream.Close();

        Directory.Delete(tempFilesFolder, true);

        var md5 = MD5.Create();

        var command = Mapper.Map<AttachmentUploadForm, AddAttachment>(form);
        command.FileData = fileBytes;
        command.FileHashCode = BitConverter.ToString(md5.ComputeHash(fileBytes)).Replace("-", "");

        return ExecuteCommand(command);
    }

Javascript(Knockout Js)

define(['util', 'ajax'], function (util, ajax) {
"use strict";

var exports = {},
     ViewModel, Attachment, FileObject;

//File Upload
FileObject = function (file, parent) {
    var self = this;
    self.fileId = util.guid();
    self.name = ko.observable(file.name);
    self.type = ko.observable(file.type);
    self.size = ko.observable();
    self.fileData = null;
    self.fileSize = ko.observable(file.size / 1024 / 1024);
    self.chunks = 0;
    self.currentChunk = ko.observable();

    var reader = new FileReader();

    // Closure to capture the file information.
    reader.onload = (function (e) {
        self.fileData = e.target.result;
        self.size(self.fileData.length);
        self.chunks = Math.ceil(self.size() / 102400);
        self.sendChunk(1);
    });

    reader.readAsDataURL(file);

    self.percentComplete = ko.computed(function () {
        return self.currentChunk() * 100 / self.chunks;
    }, self);

    self.cancel = function (record) {
        parent.uploads.remove(record);
    };

    self.sendChunk = function (number) {
        var start = (number - 1) * 102400;
        var end = number * 102400;
        self.currentChunk(number);
        var form = {
            fileId: self.fileId,
            name: self.name(),
            fileType: self.type(),
            Size: self.size(),
            FileSize: self.fileSize(),
            chunkNumber: number,
            chunkData: self.fileData.slice(start, end),
            entityTypeValue: parent.entityTypeValue,
            ReferenceId: parent.detail.id,
            ReferenceName: parent.detail.name
        };

        ajax.post('Attachment', JSON.stringify(form)).done(function (response) {
            if (number < self.chunks)
                self.sendChunk(number + 1);
            if (response.id != null) {
                parent.attachments.push(new Attachment(response));
                self.cancel(response);
            }
        });
    };
};

Attachment = function (data) {
    var self = this;
    self.id = ko.observable(data.id);
    self.name = ko.observable(data.name);
    self.fileType = ko.observable(data.fileType);
    self.fileSize = ko.observable(data.fileSize);
    self.fileData = ko.observable(data.fileData);
    self.typeName = ko.observable(data.typeName);
    self.description = ko.observable(data.description).revertable();
    self.tags = ko.observable(data.tags).revertable();
    self.operationTime = ko.observable(moment(data.createdOn).format('MM-DD-YYYY HH:mm:ss'));

    self.description.subscribe(function () {
        var form = {
            Id: self.id(),
            Description: self.description(),
            Tags: self.tags()
        };

        ajax.put('attachment', JSON.stringify(form)).done(function (response) {
            self.description.commit();
            return;
        }).fail(function () {
            self.description.revert();
        });
    });

    self.tags.subscribe(function () {
        var form = {
            Id: self.id(),
            Description: self.description(),
            Tags: self.tags()
        };

        ajax.put('attachment', JSON.stringify(form)).done(function (response) {
            self.tags.commit();
            return;
        }).fail(function () {
            self.tags.revert();
        });
    });
};

ViewModel = function (data) {
    var self = this;

    // for attachment
    self.attachments = ko.observableArray([]);
    $.each(data.attachments, function (row, val) {
        self.attachments.push(new Attachment(val));
    });

    self.deleteAttachmentRecord = function (record) {
        if (!confirm("Are you sure you want to delete this record?")) return;
        ajax.del('attachment', record.id(), { async: false }).done(function () {
            self.attachments.remove(record);
            return;
        });
    };


exports.exec = function (model) {
    console.log(model);
    var viewModel = new ViewModel(model);
    ko.applyBindings(viewModel, document.getElementById('ShowAuditDiv'));
};

return exports;
});

HTML代码:

<div class="row-fluid spacer-bottom fileDragHolder">
    <div class="spacer-bottom"></div>
    <div class="legend">
        Attachments<div class="pull-right">@Html.AttachmentPicker("AC")</div>
    </div>
    <div>
        <div class="row-fluid spacer-bottom">
            <div style="overflow: auto">
                <table class="table table-bordered table-hover table-condensed" data-bind="visible: uploads().length > 0 || attachments().length > 0">
                    <thead>
                        <tr>
                            <th class=" btn btn-primary col-md-2" style="text-align: center">
                                Name
                            </th>
                            <th class="btn btn-primary col-md-1" style="text-align: center">Type</th>
                            <th class="btn btn-primary col-md-1" style="text-align: center">Size (MB)</th>
                            <th class="btn btn-primary col-md-1" style="text-align: center">Upload Time</th>
                            <th class="btn btn-primary col-md-1" style="text-align: center">Tags</th>
                            <th class="btn btn-primary col-md-6" style="text-align: center">Description</th>
                            <th class="btn btn-primary col-md-1" style="text-align: center">Delete</th>
                        </tr>
                    </thead>
                    <tbody>
                        <!-- ko foreach: attachments -->
                        <tr>
                            <td style="text-align: center" class="col-xs-2"><a href="#" data-bind="text: name,attr:{'href':'/attachment/index?id=' + id()}"></a></td>
                            <td style="text-align: center" class="col-xs-1"><span data-bind="text: fileType"></span></td>
                            <td style="text-align: center" class="col-xs-1"><span data-bind="text: fileSize"></span></td>
                            <td style="text-align: center" class="col-xs-2"><span data-bind="text: operationTime"></span></td>
                            <td style="text-align: center" class="col-xs-3"><div contenteditable="true" data-bind="editableText: tags"></div></td>
                            <td style="text-align: center" class="col-xs-4"><div contenteditable="true" data-bind="editableText: description"></div></td>
                            <td style="text-align: center" class="col-xs-1"><button class="btn btn-primary" data-bind="click:$root.deleteAttachmentRecord"><i class="icon-trash"></i></button></td>
                        </tr>
                        <!-- /ko -->
                    </tbody>
                    <tfoot data-bind="visible: uploads().length > 0">
                        <tr>
                            <th colspan="6">Files upload status</th>
                        </tr>
                        <tr>
                            <th>Name</th>
                            <th>Type</th>
                            <th>Size (MB)</th>
                            <th colspan="2">Status</th>
                            <th></th>
                        </tr>
                        <!-- ko foreach: uploads -->
                        <tr>
                            <td><span data-bind="text: name"></span></td>
                            <td><span data-bind="text: type"></span></td>
                            <td><span data-bind="text: fileSize"></span></td>
                            <td colspan="2">
                                <div class="progress">
                                    <div class="progress-bar" data-bind="style: { width: percentComplete() + '%' }"></div>
                                </div>
                            </td>
                            <td style="text-align: center"><button class="btn btn-primary" data-bind="click:cancel"><i class="icon-trash"></i></button></td>
                        </tr>
                        <!-- /ko -->
                    </tfoot>
                </table>
            </div>
            <div data-bind="visible: attachments().length == 0" class="span12" style="margin-left:0">
                <span>No Records found.</span>
            </div>
        </div>

我给你简单易懂的理解和学习方法。

首先,您必须在.Cshtml文件中编写以下代码。

<input name="Image" type="file" class="form-control" id="resume" />

然后在你的控制器中输入以下代码:

if (i > 0) {
    HttpPostedFileBase file = Request.Files["Image"];


    if (file != null && file.ContentLength > 0) {
        if (!string.IsNullOrEmpty(file.FileName)) {
            string extension = Path.GetExtension(file.FileName);

            switch ((extension.ToLower())) {
                case ".doc":
                    break;
                case ".docx":
                    break;
                case ".pdf":
                    break;
                default:
                    ViewBag.result = "Please attach file with extension .doc , .docx , .pdf";
                    return View();
            }

            if (!Directory.Exists(Server.MapPath("~") + "\\Resume\\")) {
                System.IO.Directory.CreateDirectory(Server.MapPath("~") + "\\Resume\\");
            }

            string documentpath = Server.MapPath("~") + "\\Resume\\" + i + "_" + file.FileName;
            file.SaveAs(documentpath);
            string filename = i + "_" + file.FileName;
            result = _objbalResume.UpdateResume(filename, i);
            Attachment at = new Attachment(documentpath);

            //ViewBag.result = (ans == true ? "Thanks for contacting us.We will reply as soon as possible" : "There is some problem. Please try again later.");
        }
    } else {
        ...
    }
}

为此,您必须根据数据库制作BAL和DAL图层。


关注上传图片的代码。 我使用HTMLHelper上传图片。 在cshtml文件中放这个代码

@using (Html.BeginForm("UploadImageAction", "Admin", FormMethod.Post, new { enctype = "multipart/form-data", id = "myUploadForm" }))
{
    <div class="controls">
       @Html.UploadFile("UploadImage")
    </div>
     <button class="button">Upload Image</button>
}

然后为上传标签创建一个HTMLHelper

public static class UploadHelper
{
public static MvcHtmlString UploadFile(this HtmlHelper helper, string name, object htmlAttributes = null)
{
    TagBuilder input = new TagBuilder("input");
    input.Attributes.Add("type", "file");
    input.Attributes.Add("id", helper.ViewData.TemplateInfo.GetFullHtmlFieldId(name));
    input.Attributes.Add("name", helper.ViewData.TemplateInfo.GetFullHtmlFieldName(name));

    if (htmlAttributes != null)
    {
        var attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
        input.MergeAttributes(attributes);
    }

    return new MvcHtmlString(input.ToString());
   }
}

最后在操作上传你的文件

        [AjaxOnly]
        [HttpPost]
        public ActionResult UploadImageAction(HttpPostedFileBase UploadImage)
        {
           string path = Server.MapPath("~") + "Files\\UploadImages\\" + UploadImage.FileName;
           System.Drawing.Image img = new Bitmap(UploadImage.InputStream);    
           img.Save(path);

           return View();
        }

转移到byte[] (例如,保存到DB):

using (MemoryStream ms = new MemoryStream()) {
    file.InputStream.CopyTo(ms);
    byte[] array = ms.GetBuffer();
}

要将输入流直接传输到数据库中,而不将其存储在内存中,您可以使用从here获取的此类并稍微更改一下:

public class VarbinaryStream : Stream {
private SqlConnection _Connection;

private string _TableName;
private string _BinaryColumn;
private string _KeyColumn;
private int _KeyValue;

private long _Offset;

private SqlDataReader _SQLReader;
private long _SQLReadPosition;

private bool _AllowedToRead = false;

public VarbinaryStream(
    string ConnectionString,
    string TableName,
    string BinaryColumn,
    string KeyColumn,
    int KeyValue,
    bool AllowRead = false)
{
  // create own connection with the connection string.
  _Connection = new SqlConnection(ConnectionString);

  _TableName = TableName;
  _BinaryColumn = BinaryColumn;
  _KeyColumn = KeyColumn;
  _KeyValue = KeyValue;


  // only query the database for a result if we are going to be reading, otherwise skip.
  _AllowedToRead = AllowRead;
  if (_AllowedToRead == true)
  {
    try
    {
      if (_Connection.State != ConnectionState.Open)
        _Connection.Open();

      SqlCommand cmd = new SqlCommand(
                      @"SELECT TOP 1 [" + _BinaryColumn + @"]
                            FROM [dbo].[" + _TableName + @"]
                            WHERE [" + _KeyColumn + "] = @id",
                  _Connection);

      cmd.Parameters.Add(new SqlParameter("@id", _KeyValue));

      _SQLReader = cmd.ExecuteReader(
          CommandBehavior.SequentialAccess |
          CommandBehavior.SingleResult |
          CommandBehavior.SingleRow |
          CommandBehavior.CloseConnection);

      _SQLReader.Read();
    }
    catch (Exception e)
    {
      // log errors here
    }
  }
}

// this method will be called as part of the Stream ímplementation when we try to write to our VarbinaryStream class.
public override void Write(byte[] buffer, int index, int count)
{
  try
  {
    if (_Connection.State != ConnectionState.Open)
      _Connection.Open();

    if (_Offset == 0)
    {
      // for the first write we just send the bytes to the Column
      SqlCommand cmd = new SqlCommand(
                                  @"UPDATE [dbo].[" + _TableName + @"]
                                            SET [" + _BinaryColumn + @"] = @firstchunk 
                                        WHERE [" + _KeyColumn + "] = @id",
                              _Connection);

      cmd.Parameters.Add(new SqlParameter("@firstchunk", buffer));
      cmd.Parameters.Add(new SqlParameter("@id", _KeyValue));

      cmd.ExecuteNonQuery();

      _Offset = count;
    }
    else
    {
      // for all updates after the first one we use the TSQL command .WRITE() to append the data in the database
      SqlCommand cmd = new SqlCommand(
                              @"UPDATE [dbo].[" + _TableName + @"]
                                        SET [" + _BinaryColumn + @"].WRITE(@chunk, NULL, @length)
                                    WHERE [" + _KeyColumn + "] = @id",
                           _Connection);

      cmd.Parameters.Add(new SqlParameter("@chunk", buffer));
      cmd.Parameters.Add(new SqlParameter("@length", count));
      cmd.Parameters.Add(new SqlParameter("@id", _KeyValue));

      cmd.ExecuteNonQuery();

      _Offset += count;
    }
  }
  catch (Exception e)
  {
    // log errors here
  }
}

// this method will be called as part of the Stream ímplementation when we try to read from our VarbinaryStream class.
public override int Read(byte[] buffer, int offset, int count)
{
  try
  {
    long bytesRead = _SQLReader.GetBytes(0, _SQLReadPosition, buffer, offset, count);
    _SQLReadPosition += bytesRead;
    return (int)bytesRead;
  }
  catch (Exception e)
  {
    // log errors here
  }
  return -1;
}
public override bool CanRead
{
  get { return _AllowedToRead; }
}

protected override void Dispose(bool disposing)
{
  if (_Connection != null)
  {
    if (_Connection.State != ConnectionState.Closed)
      try { _Connection.Close();           }
      catch { }
    _Connection.Dispose();
  }
  base.Dispose(disposing);
}

#region unimplemented methods
public override bool CanSeek
{
  get { return false; }
}

public override bool CanWrite
{
  get { return true; }
}

public override void Flush()
{
  throw new NotImplementedException();
}

public override long Length
{
  get { throw new NotImplementedException(); }
}

public override long Position
{
  get
  {
    throw new NotImplementedException();
  }
  set
  {
    throw new NotImplementedException();
  }
}
public override long Seek(long offset, SeekOrigin origin)
{
  throw new NotImplementedException();
}

public override void SetLength(long value)
{
  throw new NotImplementedException();
}
#endregion unimplemented methods  }

和用法:

  using (var filestream = new VarbinaryStream(
                            "Connection_String",
                            "Table_Name",
                            "Varbinary_Column_name",
                            "Key_Column_Name",
                            keyValueId,
                            true))
  {
    postedFile.InputStream.CopyTo(filestream);
  }

通常你也想传递一个viewmodel,而不是唯一的一个文件。 在下面的代码中,您会发现一些其他有用的功能:

  • 检查文件是否已附加
  • 检查文件大小是否为0
  • 检查文件大小是否超过4 MB
  • 检查文件大小是否小于100字节
  • 检查文件扩展名

它可以通过以下代码完成:

[HttpPost]
public ActionResult Index(MyViewModel viewModel)
{
    // if file's content length is zero or no files submitted

    if (Request.Files.Count != 1 || Request.Files[0].ContentLength == 0)
    {
        ModelState.AddModelError("uploadError", "File's length is zero, or no files found");
        return View(viewModel);
    }

    // check the file size (max 4 Mb)

    if (Request.Files[0].ContentLength > 1024 * 1024 * 4)
    {
        ModelState.AddModelError("uploadError", "File size can't exceed 4 MB");
        return View(viewModel);
    }

    // check the file size (min 100 bytes)

    if (Request.Files[0].ContentLength < 100)
    {
        ModelState.AddModelError("uploadError", "File size is too small");
        return View(viewModel);
    }

    // check file extension

    string extension = Path.GetExtension(Request.Files[0].FileName).ToLower();

    if (extension != ".pdf" && extension != ".doc" && extension != ".docx" && extension != ".rtf" && extension != ".txt")
    {
        ModelState.AddModelError("uploadError", "Supported file extensions: pdf, doc, docx, rtf, txt");
        return View(viewModel);
    }

    // extract only the filename
    var fileName = Path.GetFileName(Request.Files[0].FileName);

    // store the file inside ~/App_Data/uploads folder
    var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);

    try
    {
        if (System.IO.File.Exists(path))
            System.IO.File.Delete(path);

        Request.Files[0].SaveAs(path);
    }
    catch (Exception)
    {
        ModelState.AddModelError("uploadError", "Can't save file to disk");
    }

    if(ModelState.IsValid)
    {
        // put your logic here

        return View("Success");
    }

    return View(viewModel);         
}

确保你有

@Html.ValidationMessage("uploadError")

在您的视图中出现验证错误。

还要记住默认的最大请求长度是4MB(maxRequestLength = 4096),要上传更大的文件,您必须在web.config中更改此参数:

<system.web>
    <httpRuntime maxRequestLength="40960" executionTimeout="1100" />

(40960 = 40 MB在这里)。

执行超时是整秒数。 您可能想要更改它以允许上传大量文件。


MemoryStream.GetBuffer() can return extra empty bytes at the end of the byte[], but you can fix that by using MemoryStream.ToArray() instead. However, I found this alternative to work perfectly for all file types:

using (var binaryReader = new BinaryReader(file.InputStream))
{
    byte[] array = binaryReader.ReadBytes(file.ContentLength);
}
Here's my full code:

Document Class:

public class Document
{
    public int? DocumentID { get; set; }
    public string FileName { get; set; }
    public byte[] Data { get; set; }
    public string ContentType { get; set; }
    public int? ContentLength { get; set; }

    public Document()
    {
        DocumentID = 0;
        FileName = "New File";
        Data = new byte[] { };
        ContentType = "";
        ContentLength = 0;
    }
}
File Download:

[HttpGet]
public ActionResult GetDocument(int? documentID)
{
    // Get document from database
    var doc = dataLayer.GetDocument(documentID);

    // Convert to ContentDisposition
    var cd = new System.Net.Mime.ContentDisposition
    {
        FileName = doc.FileName, 

        // Prompt the user for downloading; set to true if you want 
        // the browser to try to show the file 'inline' (display in-browser
        // without prompting to download file).  Set to false if you 
        // want to always prompt them to download the file.
        Inline = true, 
    };
    Response.AppendHeader("Content-Disposition", cd.ToString());

    // View document
    return File(doc.Data, doc.ContentType);
}
File Upload:

[HttpPost]
public ActionResult GetDocument(HttpPostedFileBase file)
{
    // Verify that the user selected a file
    if (file != null && file.ContentLength > 0)
    {
        // Get file info
        var fileName = Path.GetFileName(file.FileName);
        var contentLength = file.ContentLength;
        var contentType = file.ContentType;

        // Get file data
        byte[] data = new byte[] { };
        using (var binaryReader = new BinaryReader(file.InputStream))
        {
            data = binaryReader.ReadBytes(file.ContentLength);
        }

        // Save to database
        Document doc = new Document()
        {
            FileName = fileName,
            Data = data,
            ContentType = contentType,
            ContentLength = contentLength,
        };
        dataLayer.SaveDocument(doc);

        // Show success ...
        return RedirectToAction("Index");
    }
    else
    {
        // Show error ...
        return View("Foo");
    }
}
View (snippet):

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






asp.net-mvc-3