Thetype exposes the following members.
The type of edit.
The symbol from the later compilation, or null if the edit represents a deletion.
The symbol from the earlier compilation, or null if the edit represents an addition.
True if the edit is an update of the active method and local values should be preserved; false otherwise.
A map from syntax node in the later compilation to syntax node in the previous compilation, or null if PreserveLocalVariables is false and the map is not needed or the source of the current method is the same as the source of the previous method.