How to convert a BsonDocument into a strongly typed object with the official MongoDB C# driver?

Question

For unit testing purposes, I\'d like to test my class mappings without reading and writing documents into the MongoDB database. To handle special cases such as circular parent

Answer 1

A straight forward way if you want to map rows fetched from mongoDB to a class within your code is as below

//Connect and Query from MongoDB
var db = client.GetDatabase("blog");
var col = db.GetCollection("users");
var result = await col.Find(new BsonDocument("Email",model.Email)).ToListAsync();

//read first row from the result
var user1 = result[0];
result[0] would be say "{ "_id" : ObjectId("569c05da09f251fb0ee33f5f"), "Name" : "fKfKWCc", "Email" : "pujkvBFU@kQKeYnabk.com" }"

// a user class with name and email
User user = new User();

// assign 
User.Name = user1[1].ToString();      // user1[1] is "fKfKWCc"    
User.Email = user1[2].ToString();      // user1[2] is "pujkvBFU@kQKeYnabk.com"