FIX MAYOR BUG: Limit returns wrong result for large resultsets.

source/MongoDB.Tests/IntegrationTests/TestCursor.cs

@@ -9,7 +9,7 @@ public class TestCursor : MongoTestBase
     {
         public override string TestCollections
         {
-            get { return "sorts,hintindex,smallreads,reads"; }
+            get { return "sorts,hintindex,smallreads,reads,largereads"; }
         }
 
         public override void OnInit()
@@ -23,6 +23,11 @@ public override void OnInit()
             var reads = DB["reads"];
             for(var j = 1; j < 10000; j++)
                 reads.Insert(new Document {{"x", 4}, {"h", "hi"}, {"j", j}});
+
+            var properties = Enumerable.Range(1, 500).ToDictionary(x => x.ToString(), x => (object)x).ToArray();
+            var largereads = DB["largereads"];
+            largereads.Insert(Enumerable.Range(1, 3000).Select(i => new Document(properties)));
+
         }
 
         [Test]
@@ -36,6 +41,14 @@ public void TestCanLimit()
             Assert.AreEqual(5, reads);
         }
 
+        [Test]
+        public void TestCanLimitWithLargeResultSet()
+        {
+            var count = DB["largereads"].FindAll().Limit(2000).Documents.Count();
+
+            Assert.AreEqual(2000,count);
+        }
+
         [Test]
         public void TestCanReadAndKillCursor()
         {
@@ -59,11 +72,10 @@ public void TestCanReadMore()
             foreach(var doc in c.Documents)
             {
                 reads++;
-                if(c.Id != id)
-                {
-                    idchanges++;
-                    id = c.Id;
-                }
+                if(c.Id == id)
+                    continue;
+                idchanges++;
+                id = c.Id;
             }
             Assert.IsTrue(reads > 0, "No documents were returned.");
             Assert.IsTrue(idchanges > 0, String.Format("ReadMore message never sent. {0} changes seen", idchanges));

source/MongoDB/Cursor_1.cs

@@ -237,18 +237,27 @@ public Document Explain(){
         /// </summary>
         /// <value>The documents.</value>
         public IEnumerable<T> Documents {
-            get {
+            get
+            {
                 do
                 {
                     _reply = RetrieveData<T>();
 
                     if(_reply == null)
                         throw new InvalidOperationException("Expecting reply but get null");
 
+                    if(_limit > 0 && CursorPosition > _limit)
+                    {
+                        foreach(var document in _reply.Documents.Take(_limit - _reply.StartingFrom))
+                            yield return document;
+
+                        yield break;
+                    }
+
                     foreach(var document in _reply.Documents)
                         yield return document;
                 }
-                while(Id > 0 && _limit<CursorPosition);
+                while(Id > 0);
 
                 if(!_keepCursor)
                     Dispose(true);