How to use SetField in FindOne in MongoDB For C# Driver

Question

I use offical C# Driver for mongodb, I want to use SetFields from a FindOne query like Find.

var query = Query.EQ(\"Name\", name);
Users.Find(query).SetField         


        

Answer 1

SetFields method of MongoCursor.

Method FindOne just wrapper around MongoCursor and internally it looks so:

public virtual TDocument FindOneAs() {
   return FindAllAs().SetLimit(1).FirstOrDefault();
}

If you want add Exclude Fields functionality to it you can simply add extention method for MongoCollection :

public static class MongodbExtentions
{
    public static T FindOne(this MongoCollection collection, 
                               params string[] excludedFields)
    {
        return collection.FindAllAs().SetLimit(1)
                                        .SetFields(excludedFields)
                                        .FirstOrDefault();
    }
}

And use it like this:

 var user = Users.FindOne("Password");