From 9f226e185e6d5ffc44982ae351d5e8f08563df4a Mon Sep 17 00:00:00 2001
From: Steve Wagner <lanwin@lanwin.de>
Date: Fri, 21 May 2010 07:48:07 +0200
Subject: [PATCH] Extend the BsonWriter to write TimeSpan as Ticks (which is
 its minimal unit).

---
 source/MongoDB.Tests/UnitTests/Bson/TestBsonWriter.cs | 10 ++++++++++
 source/MongoDB/Bson/BsonWriter.cs                     |  7 ++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/source/MongoDB.Tests/UnitTests/Bson/TestBsonWriter.cs b/source/MongoDB.Tests/UnitTests/Bson/TestBsonWriter.cs
index 0348b763..d6363669 100644
--- a/source/MongoDB.Tests/UnitTests/Bson/TestBsonWriter.cs
+++ b/source/MongoDB.Tests/UnitTests/Bson/TestBsonWriter.cs
@@ -200,5 +200,15 @@ public void TestWriteBytesAsBinary()
 
             Assert.AreEqual("FwAAAAVieXRlcwAGAAAAAgIAAAAKDAA=",bson);
         }
+
+        [Test]
+        public void TestWriteTimeSpanAsTicks()
+        {
+            var span = TimeSpan.FromSeconds(123456);
+
+            var bson = Serialize(new Document("span", span));
+
+            Assert.AreEqual("EwAAABJzcGFuAACggnEfAQAAAA==",bson);
+        }
     }
 }
\ No newline at end of file
diff --git a/source/MongoDB/Bson/BsonWriter.cs b/source/MongoDB/Bson/BsonWriter.cs
index 60608407..7a818c3f 100644
--- a/source/MongoDB/Bson/BsonWriter.cs
+++ b/source/MongoDB/Bson/BsonWriter.cs
@@ -68,7 +68,10 @@ public void WriteValue(BsonType type, Object obj)
                     _writer.Write((int)obj);
                     return;
                 case BsonType.Long:
-                    _writer.Write((long)obj);
+                    if(obj is TimeSpan)
+                        _writer.Write(((TimeSpan)obj).Ticks);
+                    else
+                        _writer.Write((long)obj);
                     return;
                 case BsonType.Date:
                     Write((DateTime)obj);
@@ -579,6 +582,8 @@ protected BsonType TranslateToBsonType(object obj)
                 return BsonType.Oid;
             if(type == typeof(DateTime))
                 return BsonType.Date;
+            if(type == typeof(TimeSpan))
+                return BsonType.Long;
             if(type == typeof(MongoRegex))
                 return BsonType.Regex;
             if(type == typeof(DBRef))