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C# Driver Version 1.7 Release Notes =================================== This is a major release. This release has two major goals: to standardize on the name WriteConcern and to make Acknowledged the new default WriteConcern. The following classes are being replaced: - SafeMode is replaced by WriteConcern - SafeModeResult is replaced by WriteConcernResult - MongoSafeModeException is replaced by WriteConcernException To make Acknowledged the new default WriteConcern without breaking any existing code that might rely on the old default we are introducing a new root class called MongoClient. An online version of these release notes is available at: https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v1.7.md File by file change logs are available at: https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Change%20Log%20v1.7-Bson.txt https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Change%20Log%20v1.7-Driver.txt The full list of JIRA issues resolved in this release is available at: https://jira.mongodb.org/secure/IssueNavigator.jspa?mode=hide&requestId=12915 Documentation on the C# driver can be found at: http://www.mongodb.org/display/DOCS/CSharp+Language+Center http://api.mongodb.org/csharp/current/ Standardizing on WriteConcern instead of SafeMode ------------------------------------------------- Some MongoDB drivers (the C# driver included) have used SafeMode as the name for the class which determines whether writes to the database are checked for errors. We are now standardizing across all drivers to use the name WriteConcern instead of SafeMode. The C# driver will continue to support the SafeMode class for a few releases but eventually it will be removed. You should start using the new WriteConcern class, but we have also provided an implicit conversion from SafeMode to WriteConcern so any code that passes a SafeMode argument to a method taking a WriteConcern parameter will still compile and work. New MongoClient class and default WriteConcern ---------------------------------------------- The new default WriteConcern is Acknowledged, but we have introduced the new default in a way that doesn't alter the behavior of existing programs. We are introducing a new root class called MongoClient that defaults the WriteConcern to Acknowledged. The existing MongoServer Create methods are deprecated but when used continue to default to a WriteConcern of Unacknowledged. In prior releases you would start using the C# driver with code like this: var connectionString = "mongodb://localhost"; var server = MongoServer.Create(connectionString); // deprecated var database = server.GetDatabase("test"); // WriteConcern defaulted to Unacknowledged The new way to start using the C# driver is: var connectionString = "mongodb://localhost"; var client = new MongoClient(connectionString); var server = client.GetServer(); var database = server.GetDatabase("test"); // WriteConcern defaulted to Acknowledged If you use the old way to start using the driver the default WriteConcern will be Unacknowledged, but if you use the new way (using MongoClient) the default WriteConcern will be Acknowledged.