Merge pull request #25 from daghb/master

Removed explicit loading of netstandard on Linux/OSX only

Author: adoconnection

RazorEngineCore/RazorEngineCompilationOptions.cs

@@ -1,24 +1,41 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using Microsoft.CodeAnalysis;
 
 namespace RazorEngineCore
 {
     public class RazorEngineCompilationOptions
     {
-        public HashSet<Assembly> ReferencedAssemblies { get; set; } = new HashSet<Assembly>()
-        {
-            typeof(object).Assembly,
-            Assembly.Load(new AssemblyName("Microsoft.CSharp")),
-            typeof(RazorEngineTemplateBase).Assembly,
-            Assembly.Load(new AssemblyName("netstandard")),
-            Assembly.Load(new AssemblyName("System.Runtime")),
-            Assembly.Load(new AssemblyName("System.Linq")),
-            Assembly.Load(new AssemblyName("System.Linq.Expressions"))
-        };
+        private HashSet<Assembly> _referencedAssemblies;
+        public HashSet<Assembly> ReferencedAssemblies {
+            get
+            {
+                if (this._referencedAssemblies != null)
+                    return this._referencedAssemblies;
+
+                this._referencedAssemblies = new HashSet<Assembly>()
+                {
+                    typeof(object).Assembly,
+                    Assembly.Load(new AssemblyName("Microsoft.CSharp")),
+                    typeof(RazorEngineTemplateBase).Assembly,
+                    Assembly.Load(new AssemblyName("System.Runtime")),
+                    Assembly.Load(new AssemblyName("System.Linq")),
+                    Assembly.Load(new AssemblyName("System.Linq.Expressions"))
+                };
+
+                // Loading netstandard explicitly causes runtime error on Linux/OSX
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
+                    this._referencedAssemblies.Add(Assembly.Load(new AssemblyName("netstandard")));
+                }
+
+                return this._referencedAssemblies;
+            }
+        } 
 
         public HashSet<MetadataReference> MetadataReferences { get; set; } = new HashSet<MetadataReference>();
-        
+
         public string TemplateNamespace { get; set; } = "TemplateNamespace";
         public string Inherits { get; set; } = "RazorEngineCore.RazorEngineTemplateBase";