From 072aad48b788f066ce3315ef6ab2256efa4b49d9 Mon Sep 17 00:00:00 2001
From: rstam <robert@10gen.com>
Date: Tue, 26 Mar 2013 17:18:57 -0400
Subject: [PATCH] CSHARP-713: MongoDatabase.Eval doesn't send argument to
 server when there is exactly one argument.

---
 MongoDB.Driver/MongoDatabase.cs               |  2 +-
 MongoDB.DriverUnitTests/MongoDatabaseTests.cs | 20 +++++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/MongoDB.Driver/MongoDatabase.cs b/MongoDB.Driver/MongoDatabase.cs
index 0ebc3a4d9a1..d2bd2b81dd5 100644
--- a/MongoDB.Driver/MongoDatabase.cs
+++ b/MongoDB.Driver/MongoDatabase.cs
@@ -378,7 +378,7 @@ public virtual CommandResult DropCollection(string collectionName)
         /// <returns>The result of evaluating the code.</returns>
         public virtual BsonValue Eval(EvalFlags flags, BsonJavaScript code, params object[] args)
         {
-            var argsArray = (args != null && args.Length > 1) ? new BsonArray(args) : null;
+            var argsArray = (args != null && args.Length > 0) ? new BsonArray(args) : null;
             var command = new CommandDocument
             {
                 { "$eval", code },
diff --git a/MongoDB.DriverUnitTests/MongoDatabaseTests.cs b/MongoDB.DriverUnitTests/MongoDatabaseTests.cs
index 267fc3c60d6..2bc5fcc1621 100644
--- a/MongoDB.DriverUnitTests/MongoDatabaseTests.cs
+++ b/MongoDB.DriverUnitTests/MongoDatabaseTests.cs
@@ -99,7 +99,23 @@ public void TestEvalNoArgsNoLock()
         }
 
         [Test]
-        public void TestEvalWithArgs()
+        public void TestEvalWithOneArg()
+        {
+            var code = "function(x) { return x + 1; }";
+            var result = _database.Eval(code, 1);
+            Assert.AreEqual(2, result.ToInt32());
+        }
+
+        [Test]
+        public void TestEvalWithOneArgNoLock()
+        {
+            var code = "function(x) { return x + 1; }";
+            var result = _database.Eval(EvalFlags.NoLock, code, 1);
+            Assert.AreEqual(2, result.ToInt32());
+        }
+
+        [Test]
+        public void TestEvalWithTwoArgs()
         {
             var code = "function(x, y) { return x / y; }";
             var result = _database.Eval(code, 6, 2);
@@ -107,7 +123,7 @@ public void TestEvalWithArgs()
         }
 
         [Test]
-        public void TestEvalWithArgsNoLock()
+        public void TestEvalWithTwoArgsNoLock()
         {
             var code = "function(x, y) { return x / y; }";
             var result = _database.Eval(EvalFlags.NoLock, code, 6, 2);