Programmatically get StreamingAsset file extension

Greetings, I have looked through the docs and forums about StreamingAssets, but have not found a solution to this problem.

Let's say I want to enable users to add assets to my custom game object via the StreamingAssets directory.

If I add this to my MonoBehavior

Code (CSharp):

1. [Serializable] UnityEngine.Object m_streamableAsset;

then users are able to drag and drop assets from the StreamableAssets directory onto my custom object via the Inspector.

So far so good.

But lets say I now want to know the file extension of this asset? How can I get that?

Code (CSharp):

1. UnityEngine.Object.name

only returns the filename, without the extension.

Code (CSharp):

1. Path.GetFileName()

can't find the file with extension unless I already know it.

Is there a way to achieve this? A different class besides

Code (CSharp):

1. UnityEngine.Object

that I should use?

 

I don't think there's a perfect solution here using the vanilla editor. Creating a custom editor would allow you to intercept the data coming from the drag and drop, which should give you a more detailed reference to the asset(s) being dragged and the data you need.

A less perfect solution would be to compile a list of all assets in the StreamingAssets folder, and compare the name of your Object to the name from the list. This would require everything to be uniquely named, or a way to gather context in another way, like

Object texture;

must be in the Textures subfolder or something.

 

Yes, thank you for the response!
I considered using Drag and Drop, but using a Custom Editor worked along with AssetDatabase:

Code (CSharp):

1. SerializedProperty streamingAsset = serializedObject.FindProperty("m_streamingAsset");
2.             string fullPath = AssetDatabase.GetAssetPath(streamingAsset.objectReferenceValue);
3.  

Now of course it would be amazing if I could actually filter the values in the ObjectPicker when using

Code (CSharp):

1.  EditorGUILayout.PropertyField(streamingAsset);

I know the API allows for a little bit of filtering, but it is not well documented nor is it feature rich enough to filter by directory or file extension... So looks like I gotta roll my own or find a plugin.