View source for Documentation:MVC GetImage

<message>Write the content here to display this box</message>
With MVC, we have a controller <code><span class="col-black">'''GetImage'''</span></code> that expects an object identity and an attribute with a Blob, like this: http://localhost:5052/Turnkey/GetImage?img=9!10-SomeImage 

You may append yet another section with <code><span class="col-black">'''<nowiki/>'-''''</span></code> that denotes a content-type header to send to the browser:

'''It turns out that '-' is an exceptionally bad delimeter since both content type and file name may contain it - we now also check for '=' as a delimeter'''

http://localhost:5052/Turnkey/GetImage?img=9!10-SomeImage-application%2Fpdf will use application/pdf as the content type.

'''NEW:''' Starting from 2023-08-31 yet another parameter with '''<nowiki/>'-'''' (forth) will set the filename of the download.

This controller may be used by Angular views as well if you want to construct a link to download a file or something without actually having the attribute loaded (if it is marked as delayed fetch).

==== '''Option 1''' ====
Now you can return Text content this way too.

==== '''Option 2''' ====
For security concerns, use the <code><span class="col-black">'''AllowMVCAccess'''</span></code> tagged value on the attribute. This is the default "ok" for byte[] (to be backward compatible) and the default "notok" for strings - you can also set "okwhenauthenticated". No accessgroup evaluation is provided for GetImage.

See also [[Documentation:The ExternalId explained|The_ExternalId_explained]] to create a more long-lived link.

See also [[HowTos:Using_BlobDownloadLink]]

{{Edited|July|12|2025}}


[[Category:Application Architecture Patterns (MVC/MVVM)]]
[[Category:Architecture & Best Practices]]
[[Category:Intermediate-Friendly]]
[[Category:Priority 50]]