Download a zip file through ASP.NET MVC using DotNetZip

Question

I created a text file in a folder and archived that folder and saved the @same location for testing purposes. I wanted to download this zip file directly to the user computer after it was created. I am using the dotnetzip library and have done the following:

Response.Clear();
Response.ContentType = "application/zip";
Response.AddHeader("content-disposition", "filename=" + "sample.zip");
using (ZipFile zip = new ZipFile())
{
    zip.AddDirectory(Server.MapPath("~/Directories/hello"));
    zip.Save(Server.MapPath("~/Directories/hello/sample.zip"));
}

Can anyone suggest how a zip file can be downloaded at the end of the user?

Answer 1

You can use the Filecontroller method to return the file, for example:

public ActionResult Download()
{
    using (ZipFile zip = new ZipFile())
    {
        zip.AddDirectory(Server.MapPath("~/Directories/hello"));
        zip.Save(Server.MapPath("~/Directories/hello/sample.zip"));
        return File(Server.MapPath("~/Directories/hello/sample.zip"), 
                                   "application/zip", "sample.zip");
    }
}

If the zip file does not need to be stored in another place, there is no need to write it to a file on the server:

public ActionResult Download()
{
    using (ZipFile zip = new ZipFile())
    {
        zip.AddDirectory(Server.MapPath("~/Directories/hello"));

        MemoryStream output = new MemoryStream();
        zip.Save(output);
        return File(output.ToArray(), "application/zip", "sample.zip");
    }  
}

Answer 2

, - . . . , .

/// <summary>
///     Zip a file stream
/// </summary>
/// <param name="originalFileStream"> MemoryStream with original file </param>
/// <param name="fileName"> Name of the file in the ZIP container </param>
/// <returns> Return byte array of zipped file </returns>
private byte[] GetZippedFiles(MemoryStream originalFileStream, string fileName)
{
    using (MemoryStream zipStream = new MemoryStream())
    {
        using (ZipArchive zip = new ZipArchive(zipStream, ZipArchiveMode.Create, true))
        {
            var zipEntry = zip.CreateEntry(fileName);
            using (var writer = new StreamWriter(zipEntry.Open()))
            {
                originalFileStream.WriteTo(writer.BaseStream);
            }
            return zipStream.ToArray();
        }
    }
}

/// <summary>
///     Download zipped file
/// </summary>
[HttpGet]
public FileContentResult Download()
{
    var zippedFile = GetZippedFiles(/* your stream of original file */, "hello");
    return File(zippedFile, // We could use just Stream, but the compiler gets a warning: "ObjectDisposedException: Cannot access a closed Stream" then.
                "application/zip",
                "sample.zip");
}

:

• MemoryStream , , .. . MemoryStream, , .
• , ( ) . MemoryStream .

Answer 3

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, zip , , - zip-, ZIP ZIP .

zip-, . :

/// <summary>
///     Zip a file stream
/// </summary>
/// <param name="originalFileStream"> MemoryStream with original file </param>
/// <param name="fileName"> Name of the file in the ZIP container </param>
/// <returns> Return byte array of zipped file </returns>
private byte[] GetZippedFiles(MemoryStream originalFileStream, string fileName)
{
    using (MemoryStream zipStream = new MemoryStream())
    {
        using (ZipArchive zip = new ZipArchive(zipStream, ZipArchiveMode.Create, true))
        {
            var zipEntry = zip.CreateEntry(fileName);
            using (var writer = new StreamWriter(zipEntry.Open()))
            {
                originalFileStream.WriteTo(writer.BaseStream);
            }
        }
        return zipStream.ToArray();
    }
}

/// <summary>
///     Download zipped file
/// </summary>
[HttpGet]
public FileContentResult Download()
{
    var zippedFile = GetZippedFiles(/* your stream of original file */, "hello");
    return File(zippedFile, // We could use just Stream, but the compiler gets a warning: "ObjectDisposedException: Cannot access a closed Stream" then.
                "application/zip",
                "sample.zip");
}

Answer 4

, Zip App_Data ( zip ), Home controller :

    public FileResult DownLoad(string filename)
    {
        var content = XFile.GetFile(filename);
        return File(content, System.Net.Mime.MediaTypeNames.Application.Zip, filename);

    }

- :

   public static byte[] GetFile(string name)
    {
        string path = AppDomain.CurrentDomain.GetData("DataDirectory").ToString();
        string filenanme = path + "/" + name;
        byte[] bytes = File.ReadAllBytes(filenanme);
        return bytes;
    }

Home controller View indexes as follows:

@model  List<FileInfo>

<table class="table">
    <tr>
        <th>
            @Html.DisplayName("File Name")
        </th>
        <th>
            @Html.DisplayName("Last Write Time")
        </th>
        <th>
            @Html.DisplayName("Length (mb)")
        </th>
        <th></th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.ActionLink("DownLoad","DownLoad",new {filename=item.Name})
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.LastWriteTime)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Length)
            </td>
        </tr>
    }
</table>

Basic index file action method:

    public ActionResult Index()
    {
        var names = XFile.GetFileInformation();
        return View(names);
    }

Where GetFileInformation is an extension method:

    public static List<FileInfo> GetFileInformation()
    {
        string path = AppDomain.CurrentDomain.GetData("DataDirectory").ToString();
        var dirInfo = new DirectoryInfo(path);
        return dirInfo.EnumerateFiles().ToList();
    }

Answer 5

Create an action GETonly for the controller that returns FileResult, for example:

[HttpGet]
public FileResult Download()
{   
    // Create file on disk
    using (ZipFile zip = new ZipFile())
    {
        zip.AddDirectory(Server.MapPath("~/Directories/hello"));
        //zip.Save(Response.OutputStream);
        zip.Save(Server.MapPath("~/Directories/hello/sample.zip"));
    }

    // Read bytes from disk
    byte[] fileBytes = System.IO.File.ReadAllBytes(
        Server.MapPath("~/Directories/hello/sample.zip"));
    string fileName = "sample.zip";

    // Return bytes as stream for download
    return File(fileBytes, "application/zip", fileName);
}