How to download image from url

Question

Is there a way to download an image directly from a url in c  if the url does not have an image format at the end of the link  Example of url   https   fbcdn-sphotos-h-a akamaihd net hphotos-ak-xpf1 v t34 0-12 10555140 10201501435212873 1318258071 n jpg oh 97ebc03895b7acee9aebbde7d6b002bf amp oe 53C9ABB0 amp   gda   1405685729 110e04e71d969d392b63b27ec4f4b24a   I know how to download the image when the url ends with an image format  Eg   http   img1 wikia nocookie net   cb20101219155130 uncyclopedia images 7 70 Facebooklogin png

User · Answer

Depending whether or not you know the image format, here are ways you can do it :

Download Image to a file, knowing the image format

using (WebClient webClient = new WebClient()) 
{
   webClient.DownloadFile("http://yoururl.com/image.png", "image.png") ; 
}

Download Image to a file without knowing the image format

You can use Image.FromStream to load any kind of usual bitmaps (jpg, png, bmp, gif, ... ), it will detect automaticaly the file type and you don't even need to check the url extension (which is not a very good practice). E.g:

using (WebClient webClient = new WebClient()) 
{
    byte [] data = webClient.DownloadData("https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/v/t34.0-12/10555140_10201501435212873_1318258071_n.jpg?oh=97ebc03895b7acee9aebbde7d6b002bf&oe=53C9ABB0&__gda__=1405685729_110e04e71d9");

   using (MemoryStream mem = new MemoryStream(data)) 
   {
       using (var yourImage = Image.FromStream(mem)) 
       { 
          // If you want it as Png
           yourImage.Save("path_to_your_file.png", ImageFormat.Png) ; 

          // If you want it as Jpeg
           yourImage.Save("path_to_your_file.jpg", ImageFormat.Jpeg) ; 
       }
   } 

}

Note : ArgumentException may be thrown by Image.FromStream if the downloaded content is not a known image type.

Check this reference on MSDN to find all format available. Here are reference to WebClient and Bitmap.

User · Answer

Simply  You can use following methods   using  WebClient client   new WebClient           client DownloadFile new Uri url     c  temp image35 png           OR      client DownloadFileAsync new Uri url     c  temp image35 png        These methods are almost same as DownloadString     and DownloadStringAsync       They store the file in Directory rather than in C  string and no need of Format extension in URi  If You don t know the Format  png   jpeg etc  of Image  public void SaveImage string filename  ImageFormat format            WebClient client   new WebClient        Stream stream   client OpenRead imageUrl       Bitmap bitmap   bitmap   new Bitmap stream        if  bitmap    null                bitmap Save filename  format              stream Flush        stream Close        client Dispose        Using it  try       SaveImage  --- Any Image Path ---   ImageFormat Png    catch ExternalException           Something is wrong with Format -- Maybe required Format is not         applicable here   catch ArgumentNullException              Something wrong with Stream

User · Answer

Most of the posts that I found will timeout after a second iteration  Particularly if you are looping through a bunch if images as I have been  So to improve the suggestions above here is the entire method    public System Drawing Image DownloadImage string imageUrl                System Drawing Image image   null           try                       System Net HttpWebRequest webRequest    System Net HttpWebRequest System Net HttpWebRequest Create imageUrl               webRequest AllowWriteStreamBuffering   true              webRequest Timeout   30000              webRequest ServicePoint ConnectionLeaseTimeout   5000              webRequest ServicePoint MaxIdleTime   5000               using  System Net WebResponse webResponse   webRequest GetResponse                                   using  System IO Stream stream   webResponse GetResponseStream                                          image   System Drawing Image FromStream stream                                                webRequest ServicePoint CloseConnectionGroup webRequest ConnectionGroupName               webRequest   null                     catch  Exception ex                        throw new Exception ex Message  ex                        return image

User · Answer

It is not necessary to use System Drawing to find the image format in a URI  System Drawing is not available for  NET Core unless you download the System Drawing Common NuGet package and therefore I don t see any good cross-platform answers to this question  Also  my example does not use System Net WebClient since Microsoft explicitly discourage the use of System Net WebClient   We don t recommend that you use the WebClient class for new development  Instead  use the System Net Http HttpClient class   Download an image from a URL and write it to a file  cross platform    Without old System Net WebClient and System Drawing  This method will asynchronously download an image  or any file as long as the URI has a file extension  using the System Net Http HttpClient and then write it to a file  using the same file extension as the image had in the URI  Getting the file extension First part of getting the file extension is removing all the unnecessary parts from the URI  We use Uri GetLeftPart   with UriPartial Path to get everything from the Scheme up to the Path  In other words  https   www example com image png query amp with dots becomes https   www example com image png  After that  we use Path GetExtension   to get only the extension  in my previous example   png   var uriWithoutQuery   uri GetLeftPart UriPartial Path   var fileExtension   Path GetExtension uriWithoutQuery    Downloading the image From here it should be straight forward  Download the image with HttpClient GetByteArrayAsync  create the path  ensure the directory exists and then write the bytes to the path with File WriteAllBytesAsync    or File WriteAllBytes if you are on  NET Framework  private async Task DownloadImageAsync string directoryPath  string fileName  Uri uri        using var httpClient   new HttpClient            Get the file extension     var uriWithoutQuery   uri GetLeftPart UriPartial Path       var fileExtension   Path GetExtension uriWithoutQuery           Create file path and ensure directory exists     var path   Path Combine directoryPath    quot  fileName  fileExtension  quot        Directory CreateDirectory directoryPath           Download the image and write to the file     var imageBytes   await  httpClient GetByteArrayAsync uri       await File WriteAllBytesAsync path  imageBytes      Note that you need the following using directives  using System  using System IO  using System Threading Tasks  using System Net Http   Example usage var folder    quot images quot   var fileName    quot test quot   var url    quot https   cdn discordapp com attachments 458291463663386646 592779619212460054 Screenshot 20190624-201411 jpg query amp with dots quot    await DownloadImageAsync folder  fileName  new Uri url     Notes  It s bad practice to create a new HttpClient for every method call  It is supposed to be reused throughout the application  I wrote a short example of an ImageDownloader 50 lines  with more documentation that correctly reuses the HttpClient and properly disposes of it that you can find here

User · Answer

net Framework allows PictureBox Control to Load Images from url  and Save image in Laod Complete Event  protected void LoadImage      pictureBox1 ImageLocation    PROXY URL    void pictureBox1 LoadCompleted object sender  AsyncCompletedEventArgs e       pictureBox1 Image Save destination

User · Answer

For anyone who wants to download an image WITHOUT saving it to a file   Image DownloadImage string fromUrl        using  System Net WebClient webClient   new System Net WebClient                  using  Stream stream   webClient OpenRead fromUrl                         return Image FromStream stream

User · Answer

Try this it worked for me  Write this in your Controller  public class DemoController  Controller          public async Task lt FileStreamResult gt  GetLogoImage string logoimage                        string str                    var filePath   Server MapPath    App Data     SubfolderName    If subfolder exist otherwise leave                 DirectoryInfo dir   new DirectoryInfo filePath               string   filePaths   Directory GetFiles  filePath                      foreach  var fileTemp in filePaths                                  str  fileTemp ToString                                  return File new MemoryStream System IO File ReadAllBytes str    System Web MimeMapping GetMimeMapping str   Path GetFileName str                Here is my view                                  lt div gt  lt a href   DemoController GetLogoImage Type Logo  target   blank  gt Download Logo lt  a gt  lt  div gt

[c#] How to download image from url

Download Image to a file, knowing the image format

Download Image to a file without knowing the image format

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