NightOwl888 commented on issue #336:
URL: https://github.com/apache/lucenenet/issues/336#issuecomment-696156234


   We've updated the compilation symbols so they don't depend directly on the target framework:
   
   ```c#
               if (input.memoryMappedFile == null)
               {
                   input.memoryMappedFile = MemoryMappedFile.CreateFromFile(
                       fileStream: fc, 
                       mapName: null, 
                       capacity: length, 
                       access: MemoryMappedFileAccess.Read,
   #if FEATURE_MEMORYMAPPEDFILESECURITY
                       memoryMappedFileSecurity: null,
   #endif
                       inheritability: HandleInheritability.Inheritable, 
                       leaveOpen: true); // LUCENENET: We explicitly dispose the FileStream separately.
               }
   ```
   
   This makes the default disable the `memoryMappedFileSecurity` parameter unless the `FEATURE_MEMORYMAPPEDFILESECURITY` compilation symbol is added. The [Directory.Build.targets](https://github.com/apache/lucenenet/blob/b2f737de07242869819054642081337812488903/Directory.Build.targets) file maps the target framework to features for the entire solution.
   
   There really doesn't seem to be any more to do here, so I am closing this issue.
   
   


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