Implemented CSHARP-254. Several return values that could potentially overflow Int32 have been changed to Int64.

Driver/Core/CommandResults/GetLastErrorResult.cs

@@ -39,8 +39,8 @@ namespace MongoDB.Driver {
         /// <summary>
         /// Gets the number of documents affected.
         /// </summary>
-        public int DocumentsAffected {
-            get { return response["n"].ToInt32(); }
+        public long DocumentsAffected {
+            get { return response["n"].ToInt64(); }
         }
 
         /// <summary>

Driver/Core/CommandResults/MapReduceResult.cs

@@ -79,15 +79,15 @@ namespace MongoDB.Driver {
         /// <summary>
         /// Gets the emit count.
         /// </summary>
-        public int EmitCount {
-            get { return response["counts"].AsBsonDocument["emit"].ToInt32(); }
+        public long EmitCount {
+            get { return response["counts"].AsBsonDocument["emit"].ToInt64(); }
         }
 
         /// <summary>
         /// Gets the output count.
         /// </summary>
-        public int OutputCount {
-            get { return response["counts"].AsBsonDocument["output"].ToInt32(); }
+        public long OutputCount {
+            get { return response["counts"].AsBsonDocument["output"].ToInt64(); }
         }
 
         /// <summary>
@@ -100,8 +100,8 @@ namespace MongoDB.Driver {
         /// <summary>
         /// Gets the input count.
         /// </summary>
-        public int InputCount {
-            get { return response["counts"].AsBsonDocument["input"].ToInt32(); }
+        public long InputCount {
+            get { return response["counts"].AsBsonDocument["input"].ToInt64(); }
         }
         #endregion
 

Driver/Core/MongoCollection.cs

@@ -93,7 +93,7 @@ namespace MongoDB.Driver {
         /// Counts the number of documents in this collection.
         /// </summary>
         /// <returns>The number of documents in this collection.</returns>
-        public virtual int Count() {
+        public virtual long Count() {
             return Count(Query.Null);
         }
 
@@ -102,7 +102,7 @@ namespace MongoDB.Driver {
         /// </summary>
         /// <param name="query">The query (usually a QueryDocument or constructed using the Query builder).</param>
         /// <returns>The number of documents in this collection that match the query.</returns>
-        public virtual int Count(
+        public virtual long Count(
             IMongoQuery query
         ) {
             var command = new CommandDocument {
@@ -110,7 +110,7 @@ namespace MongoDB.Driver {
                 { "query", BsonDocumentWrapper.Create(query) } // query is optional
             };
             var result = database.RunCommand(command);
-            return result.Response["n"].ToInt32();
+            return result.Response["n"].ToInt64();
         }
 
         /// <summary>

Driver/Core/MongoCursor.cs

@@ -243,14 +243,14 @@ namespace MongoDB.Driver {
         /// Returns the number of documents that match the query (ignores Skip and Limit, unlike Size which honors them).
         /// </summary>
         /// <returns>The number of documents that match the query.</returns>
-        public virtual int Count() {
+        public virtual long Count() {
             isFrozen = true;
             var command = new CommandDocument {
                 { "count", collection.Name },
                 { "query", BsonDocumentWrapper.Create(query) } // query is optional
             };
             var result = database.RunCommand(command);
-            return result.Response["n"].ToInt32();
+            return result.Response["n"].ToInt64();
         }
 
         /// <summary>
@@ -548,7 +548,7 @@ namespace MongoDB.Driver {
         /// Returns the size of the result set (honors Skip and Limit, unlike Count which does not).
         /// </summary>
         /// <returns>The size of the result set.</returns>
-        public virtual int Size() {
+        public virtual long Size() {
             isFrozen = true;
             var command = new CommandDocument {
                 { "count", collection.Name },
@@ -557,7 +557,7 @@ namespace MongoDB.Driver {
                 { "skip", skip, skip != 0 }
             };
             var result = database.RunCommand(command);
-            return result.Response["n"].ToInt32();
+            return result.Response["n"].ToInt64();
         }
         #endregion
 

Driver/GridFS/MongoGridFSFileInfo.cs

@@ -35,7 +35,7 @@ namespace MongoDB.Driver.GridFS {
         private int chunkSize;
         private string contentType;
         private BsonValue id; // usually a BsonObjectId but not required to be
-        private int length;
+        private long length;
         private string md5;
         private BsonDocument metadata;
         private string name;
@@ -172,7 +172,7 @@ namespace MongoDB.Driver.GridFS {
         /// <summary>
         /// Gets the file lenth.
         /// </summary>
-        public int Length {
+        public long Length {
             get {
                 if (!cached) { Refresh(); }
                 return length;
@@ -491,7 +491,7 @@ namespace MongoDB.Driver.GridFS {
                 }
                 exists = true;
                 id = fileInfo["_id"];
-                length = fileInfo["length"].ToInt32();
+                length = fileInfo["length"].ToInt64();
                 var md5Value = fileInfo["md5", null];
                 if (md5Value != null && !md5Value.IsBsonNull) {
                     md5 = md5Value.AsString;