SharePoint 2013: How can I tell if my page is in edit mode?

The solution lies in the object model: Microsoft.SharePoint.SPContext.Current.FormContext.FormMode
It returns a SPControlMode enumeration.

An example usage of the code is as follows:

if (Microsoft.SharePoint.SPContext.Current.FormContext.FormMode == SPControlMode.Display)
{
  // Do display stuff
}
else if ( Microsoft.SharePoint.SPContext.Current.FormContext.FormMode = SPControlMode.Edit )
{
  // Do edit stuff
}

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