# Sandbox.CodeArchive.FileHashMap

```csharp
System.Collections.Concurrent.ConcurrentDictionary<string,ulong> FileHashMap { get; set; }
```

Hashes of source files, used for incremental compiles. Not serialized right now.

Declared in [Sandbox.CodeArchive](/api/Sandbox.CodeArchive).
Assembly: `Sandbox.Compiling`.