Add PCL API's for getting File/Directory names and fallack ReferenceAssembyPath to use latest v4 release

Author: mythz

src/ServiceStack.Text/Env.cs

@@ -97,22 +97,17 @@ public static string ReferenceAssembyPath
                         referenceAssembyPath = netFxReferenceBasePath + @"v4.0\";
                     else
                     {
-                        var dir = new DirectoryInfo(netFxReferenceBasePath);
-                        if (dir.Exists)
+                        var v4Dirs = PclExport.Instance.GetDirectoryNames(netFxReferenceBasePath, "v4*");
+                        if (v4Dirs.Length > 0)
                         {
-                            var fxDirs = dir.GetDirectories();
-                            foreach (var fxDir in fxDirs)
-                            {
-                                if (fxDir.Name.StartsWith("v4"))
-                                {
-                                    return referenceAssembyPath = netFxReferenceBasePath + fxDir.Name + @"\";
-                                }
-                            }
+                            referenceAssembyPath = v4Dirs[v4Dirs.Length - 1]; //latest v4
+                        }
+                        else
+                        {
+                            throw new FileNotFoundException(
+                                "Could not infer .NET Reference Assemblies path, e.g '{0}'.\n".Fmt(netFxReferenceBasePath + @"v4.0\") +
+                                "Provide path manually 'Env.ReferenceAssembyPath'.");
                         }
-
-                        throw new FileNotFoundException(
-                            "Could not infer .NET Reference Assemblies path, e.g '{0}'.\n".Fmt(netFxReferenceBasePath + @"v4.0\") +
-                            "Provide path manually 'Env.ReferenceAssembyPath'.");
                     }
                 }
 #endif

src/ServiceStack.Text/PclExport.Net40.cs

@@ -95,6 +95,26 @@ public override void CreateDirectory(string dirPath)
             Directory.CreateDirectory(dirPath);
         }
 
+        public override string[] GetFileNames(string dirPath, string searchPattern = null)
+        {
+            if (!Directory.Exists(dirPath))
+                return new string[0];
+
+            return searchPattern != null
+                ? Directory.GetFiles(dirPath, searchPattern)
+                : Directory.GetFiles(dirPath);
+        }
+
+        public override string[] GetDirectoryNames(string dirPath, string searchPattern = null)
+        {
+            if (!Directory.Exists(dirPath))
+                return new string[0];
+
+            return searchPattern != null
+                ? Directory.GetDirectories(dirPath, searchPattern)
+                : Directory.GetDirectories(dirPath);
+        }
+
         public const string AppSettingsKey = "servicestack:license";
         public override void RegisterLicenseFromConfig()
         {

src/ServiceStack.Text/PclExport.cs

@@ -164,6 +164,16 @@ public virtual string GetEnvironmentVariable(string name)
             return null;
         }
 
+        public virtual string[] GetFileNames(string dirPath, string searchPattern = null)
+        {
+            return new string[0];
+        }
+
+        public virtual string[] GetDirectoryNames(string dirPath, string searchPattern = null)
+        {
+            return new string[0];
+        }
+
         public virtual void WriteLine(string line)
         {
         }

tests/ServiceStack.Text.Tests/PclApiTests.cs

@@ -0,0 +1,17 @@
+using NUnit.Framework;
+
+namespace ServiceStack.Text.Tests
+{
+    [TestFixture]
+    public class PclApiTests
+    {
+        [Test, Explicit]
+        public void Can_scan_reference_assemblies()
+        {
+            var refDir = @"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\";
+
+            PclExport.Instance.GetDirectoryNames(refDir).PrintDump();
+            PclExport.Instance.GetDirectoryNames(refDir, "v4*").PrintDump();
+        }
+    }
+}

tests/ServiceStack.Text.Tests/ServiceStack.Text.Tests.csproj

@@ -182,6 +182,7 @@
     <Compile Include="JsonTests\JsonEnumTests.cs" />
     <Compile Include="JsonTests\InvalidJsonTests.cs" />
     <Compile Include="JsonTests\TypeInfoTests.cs" />
+    <Compile Include="PclApiTests.cs" />
     <Compile Include="SerializationDelegatePerformanceTests.cs" />
     <Compile Include="SerializationHookTests.cs" />
     <Compile Include="StaticAccessorTests.cs" />