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How to create in memory layer and how to visualize these?

Question asked by golden_jubilee on Sep 25, 2012
Latest reply on Sep 26, 2012 by Hornbydd
At the moment I am building an add in in C#.

My goal is to use the data of an existing feature layer and to perform some calculations with this data.
That works fine...

Now I want to visualize the new values with a feature renderer like the UniqueValueRenderer.
To achieve this I want to create an in-memory layer, which is a merge of the existing layer and my new data.

I already found the InMemoryWorkspace but the doc says I can not create feature datasets within.

Is there a way to do this on the fly or do I have to copy the old one add my column(s), add it to the TOC and later on use one of therenderer?