allowed predefined references from file

Author: kerryjiang

src/ICSharpCore/Script/InteractiveScriptEngine.cs

@@ -37,13 +37,22 @@ public class InteractiveScriptEngine
 
         private string _currentDirectory;
 
+        private string[] _references;
+
         public InteractiveScriptEngine(string currentDir, ILogger logger)
         {
             _currentDirectory = currentDir;
             _logger = logger;
 
             _scriptOptions = CreateScriptOptions();
 
+            var referencesFile = Path.Combine(Directory.GetCurrentDirectory(), "refs.txt");
+
+            if (File.Exists(referencesFile))
+            {
+                _references = File.ReadAllLines(referencesFile, Encoding.UTF8);
+            }
+
             _runtimeDependencyResolver = new RuntimeDependencyResolver((t) => (level, m, e) =>
             {
                 logger.Log(MapLogLevel(level), m, e);
@@ -85,6 +94,15 @@ public async Task<object> ExecuteAsync(string statement)
                     "using static ICSharpCore.Primitives.DisplayDataEmitter;"
                 };
 
+                var refsFromFile = string.Empty;
+
+                var references = _references;
+
+                if (references != null && references.Any())
+                {
+                    usingStatements = references.Union(usingStatements).ToArray();
+                }
+
                 _scriptState = await CSharpScript.RunAsync(string.Join("\r\n", usingStatements), _scriptOptions, globals: _globals);
                 _scriptState = await _scriptState.ContinueWithAsync(statement, _scriptOptions);
             }