I am unable to find the configuration setting, where my ECL dll is referred to from the SDL CM side.

I have checked, and its not there in the Tridion.ContentManager.config.

Is there any standard. Any help is much appreciated.


3 Answers 3


Mountpoints configured in ExternalContentLibrary.xml

Every mountpoint element has attribute type (e.g type="My Custom Provider")

Every provider has main class that implements IContentLibrary

And this class must have attribute AddIn (e.g [AddIn("My Custom Provider", Version = "")])

Name in AddIn attribute in class matched with type attribute in mountpoint xml, and this how ECL find proper dll for particular mountpoint.


In ExternalContentLibrary.xml

    <MountPoint type="My Custom Provider" id="mcp" rootItemName="Test">

In main class of provider

    [AddIn("My Custom Provider", Version = "")]
    public class MyProvider : IContentLibrary

Actually, those settings are available in the ExternalContentLibrary.xml file under

C:\{SDLWEB Installation Folder}\Config\

You can find mount points for each of your ECL links, Example:

<MountPoint type="Local File System Provider" id="ffs1" rootItemName="Digital Assets Management">
    <StubFolder id="tcm:1-633-2" />
    <StubFolder id="tcm:8-733-2" />
  <FolderPath>C:\Working Areas\ECL\DAM</FolderPath>

Hope this helps to make changes to ECL configuration and move forward

  • Yes. This is there. But, how does SDL Tridion know where to pick up the ECL Custom DLL from?
    – guest_2017
    Commented Apr 6, 2017 at 8:23
  • Tricky undocumented question :)
    – Rajesh
    Commented Apr 6, 2017 at 12:03
  • Actually, those are picked from the following location, C:\ProgramData\SDL\SDL Tridion\External Content Library\AddInPipeline\AddIns Remember, though you use SDL Web, it still picks up from SDL Tridion folder Don't forget to mark the answer if this helps resolving your issue
    – Rajesh
    Commented Apr 6, 2017 at 12:04
  • You are correct about the path. My Custom ECL dll is placed in - C:\ProgramData\SDL\SDL Tridion\External Content Library\AddInPipeline\AddIns, and ExternalContentLibrary.xml is under `{Tridion Home}\config` folder. But, I am not sure how the dll is referred to if it is under a different location and XML under different location. Is is the standard path and SDL will pick it up from this location? That is my real question.
    – guest_2017
    Commented Apr 6, 2017 at 13:31
  • Ok, as you are trying to understand the concept rather than looking for a quick solution, I have now updated the example code. You can specify the location of the dll as well, but note that the type ="Local File System Provider". For any other type, I believe it will try to look inside the programdata location which I mentioned earlier and will not consider the external path even if specified.
    – Rajesh
    Commented Apr 6, 2017 at 17:42

This entry should be in the Tridion.ContentManager.config file Under {Tridion Home}\config\ folder.

Search for extensions tag. Under that tag you can find the entry for ECL Library. If it is not there then add that entry like below -

<add assemblyFileName="D:\Tridion\bin\Tridion.ExternalContentLibrary.TcmExtension.dll" /> 
  • Yes. This is there. Now, I have an adapter code, which is used to fetch media items from a 3rd party via a service. This is a separate dll, that is also deployed at another location, in the same CM server. Now my question is, how is SDL using it? As I do not see any reference to this custom DLL in any config files. Also it is using the ExternalContentLibrary.xml located in the {Tridion Home}\config\ folder, where the URL for this 3rd party is mentioned.
    – guest_2017
    Commented Apr 6, 2017 at 8:41
  • Tridion.ExternalContentLibrary.TcmExtension.dll - has nothing to do with ECL adapters Commented Apr 21, 2017 at 7:44
  • Correct @YuriBondarchuk ..!! And thank you for giving a clear explanation as well.
    – guest_2017
    Commented May 9, 2017 at 13:58

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