Set modified date in EmbeddedFileProvider

Author: BrennanConroy

src/Microsoft.Extensions.FileProviders.Embedded/EmbeddedFileProvider.cs

@@ -49,8 +49,24 @@ public EmbeddedFileProvider(Assembly assembly, string baseNamespace)
 
             _baseNamespace = string.IsNullOrEmpty(baseNamespace) ? string.Empty : baseNamespace + ".";
             _assembly = assembly;
-            // REVIEW: Does this even make sense?
-            _lastModified = DateTimeOffset.MaxValue;
+
+            _lastModified = DateTimeOffset.UtcNow;
+
+#if NETSTANDARD1_5 || NET451
+            if (!string.IsNullOrEmpty(_assembly.Location))
+            {
+                try
+                {
+                    _lastModified = File.GetLastWriteTimeUtc(_assembly.Location);
+                }
+                catch (PathTooLongException)
+                {
+                }
+                catch (UnauthorizedAccessException)
+                {
+                }
+            }
+#endif
         }
 
         /// <summary>

src/Microsoft.Extensions.FileProviders.Embedded/project.json

@@ -24,13 +24,18 @@
       "version": "1.1.0-*",
       "type": "build"
     },
-    "Microsoft.Extensions.FileProviders.Abstractions": "1.1.0-*"
+    "Microsoft.Extensions.FileProviders.Abstractions": "1.1.0-*",
+    "System.Runtime.Extensions": "4.1.0-*"
   },
   "frameworks": {
-    "netstandard1.0": {
+    // need to keep netstandard1.0 until ASP.NET Core 2.0 because it is a breaking change if we remove it
+    "netstandard1.0": { },
+    "netstandard1.5": {
       "dependencies": {
-        "System.Runtime.Extensions": "4.1.0-*"
+        "System.IO.FileSystem": "4.0.1-*",
+        "System.Reflection": "4.1.0-*"
       }
-    }
+    },
+    "net451": { }
   }
 }