Adds a .NET 3.5 build option

Author: ThadHouse

src/NativeLibraryUtilities/NativeDelegateInitializer.cs

@@ -43,7 +43,11 @@ public static Delegate SetupNativeDelegate(ILibraryInformation library, string n
         /// <param name="library">The object containing the native library to load from</param>
         public static void SetupNativeDelegates<T>(ILibraryInformation library)
         {
+#if NET35
+            var info = typeof(T);
+#else
             TypeInfo info = typeof(T).GetTypeInfo();
+#endif
 #if NETSTANDARD
             MethodInfo getDelegateForFunctionPointer =
                 typeof(Marshal).GetTypeInfo().GetMethods(BindingFlags.Static | BindingFlags.Public)
@@ -73,7 +77,11 @@ public static void SetupNativeDelegates<T>(ILibraryInformation library)
         public static List<string> GetNativeDelegateList<T>()
         {
             List<string> nativeList = new List<string>();
+#if NET35
+            var info = typeof(T);
+#else
             TypeInfo info = typeof(T).GetTypeInfo();
+#endif
             foreach (FieldInfo field in info.GetFields(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic))
             {
                 var attribute = (NativeDelegateAttribute)field.GetCustomAttribute(typeof(NativeDelegateAttribute));
@@ -92,7 +100,11 @@ public static List<string> GetNativeDelegateList<T>()
         public static List<string> GetNativeDelegateList(Type type)
         {
             List<string> nativeList = new List<string>();
+#if NET35
+            var info = type;
+#else
             TypeInfo info = type.GetTypeInfo();
+#endif
             foreach (FieldInfo field in info.GetFields(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic))
             {
                 var attribute = (NativeDelegateAttribute)field.GetCustomAttribute(typeof(NativeDelegateAttribute));

src/NativeLibraryUtilities/NativeLibraryLoader.cs

@@ -58,7 +58,7 @@ public void LoadNativeLibrary<T>(ILibraryLoader loader, string location, bool di
                 throw new ArgumentNullException(nameof(location), "Library location cannot be null");
 
             // Set to use temp file if extractLocation is null
-            if (string.IsNullOrWhiteSpace(extractLocation) && !directLoad)
+            if (StringUtil.IsNullOrWhiteSpace(extractLocation) && !directLoad)
             {
                 extractLocation = Path.GetTempFileName();
                 UsingTempFile = true;
@@ -251,7 +251,11 @@ private void ExtractNativeLibrary(string resourceLocation, string extractLocatio
 
         private void ExtractNativeLibrary(string resourceLocation, string extractLocation, Type type)
         {
+#if NET35
+            ExtractNativeLibrary(resourceLocation, extractLocation, type.Assembly);
+#else
             ExtractNativeLibrary(resourceLocation, extractLocation, type.GetTypeInfo().Assembly);
+#endif
         }
 
         private static bool Is64BitOs()

src/NativeLibraryUtilities/Net35Extensions.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+namespace NativeLibraryUtilities
+{
+    #if NET35
+    internal static class Net35Extensions
+    {
+
+        public static object GetCustomAttribute(this FieldInfo info, Type t)
+        {
+            return Attribute.GetCustomAttribute(info, t);
+        }
+    }
+#endif
+}

src/NativeLibraryUtilities/StringUtil.cs

@@ -0,0 +1,16 @@
+namespace NativeLibraryUtilities
+{
+    internal static class StringUtil
+    {
+        public static bool IsNullOrWhiteSpace(string value)
+        {
+            if (value == null) return true;
+
+            for(int i = 0; i < value.Length; i++) {
+                if(!char.IsWhiteSpace(value[i])) return false;
+            }
+
+            return true;
+        }
+    }
+}

src/NativeLibraryUtilities/project.json

@@ -31,6 +31,11 @@
   },
   "frameworks": {
     "net45": {},
+    "net35": {
+      "buildOptions": {
+        "define": [ "NET35" ]
+      }
+    },
     "netstandard1.5": {
       "buildOptions": {
         "define": [ "NETSTANDARD" ]