I am trying to create a Sharepoint Add-In which calls a C# method when the Add-In page loads. I have tried calling the C# method from javascript, but that does not seem to work. Any help would be greatly appreciated.


As Trevor's suggestion, if want to use C# code in SharePoint Add-in, it's necessary to use Provider Hosted Add-in Type rather than SharePoint hosted Add-in (which is build with total client side code, html/javascript), for creating Provider Hosted Add-in, please refer the following demo:

Provider Hosted App in SharePoint Online using Visual Studio 2017 + Deploy Provider Hosted Add-in to Microsoft Azure

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