Ignore unlisted packages

src/Microsoft.Framework.PackageManager/Restore/NuGet/HttpSource.cs

@@ -155,7 +155,7 @@ await ConcurrencyUtilities.ExecuteWithFileLocked(result.CacheFileName, async _ =
                     }
                 }
 
-                // If the desitnation file doesn't exist, we can safely perform moving operation.
+                // If the destination file doesn't exist, we can safely perform moving operation.
                 // Otherwise, moving operation will fail.
                 if (!File.Exists(result.CacheFileName))
                 {

src/Microsoft.Framework.PackageManager/Restore/NuGet/NuGetv2Feed.cs

@@ -21,6 +21,10 @@ public class NuGetv2Feed : IPackageFeed
         private static readonly XName _xnameProperties = XName.Get("properties", "http://schemas.microsoft.com/ado/2007/08/dataservices/metadata");
         private static readonly XName _xnameId = XName.Get("Id", "http://schemas.microsoft.com/ado/2007/08/dataservices");
         private static readonly XName _xnameVersion = XName.Get("Version", "http://schemas.microsoft.com/ado/2007/08/dataservices");
+        private static readonly XName _xnamePublish = XName.Get("Published", "http://schemas.microsoft.com/ado/2007/08/dataservices");
+
+        // An unlisted package's publish time must be 1900-01-01T00:00:00.
+        private static readonly DateTime _unlistedPublishedTime = new DateTime(1900, 1, 1, 0, 0, 0);
 
         private readonly string _baseUri;
         private readonly Reports _reports;
@@ -89,7 +93,7 @@ public async Task<IEnumerable<PackageInfo>> FindPackagesByIdAsyncCore(string id)
                     var page = 1;
                     while (true)
                     {
-                        // TODO: Pages for a package Id are cahced separately.
+                        // TODO: Pages for a package Id are cached separately.
                         // So we will get inaccurate data when a page shrinks.
                         // However, (1) In most cases the pages grow rather than shrink;
                         // (2) cache for pages is valid for only 30 min.
@@ -104,7 +108,8 @@ public async Task<IEnumerable<PackageInfo>> FindPackagesByIdAsyncCore(string id)
 
                                 var result = doc.Root
                                     .Elements(_xnameEntry)
-                                    .Select(x => BuildModel(id, x));
+                                    .Select(x => BuildModel(id, x))
+                                    .Where(x => x != null);
 
                                 results.AddRange(result);
 
@@ -170,6 +175,16 @@ public PackageInfo BuildModel(string id, XElement element)
             var idElement = properties.Element(_xnameId);
             var titleElement = element.Element(_xnameTitle);
 
+            var publishElement = properties.Element(_xnamePublish);
+            if (publishElement != null)
+            {
+                DateTime publishDate; 
+                if (DateTime.TryParse(publishElement.Value, out publishDate) && (publishDate == _unlistedPublishedTime))
+                {
+                    return null; 
+                }
+            }
+
             return new PackageInfo
             {
                 // If 'Id' element exist, use its value as accurate package Id

src/Microsoft.Framework.PackageManager/Restore/RestoreCommand.cs

@@ -41,7 +41,7 @@ public RestoreCommand(IApplicationEnvironment env)
         public string PackageFolder { get; set; }
         public string GlobalJsonFile { get; set; }
 
-        public string RestorePackageId { get; set; }
+        public string RestorePackageId { get; set; } 
         public string RestorePackageVersion { get; set; }
 
         public string AppInstallPath { get; private set; }