https://docs.mongodb.com/getting-started/csharp/insert/

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You can use the InsertOneAsync method and the InsertManyAsync method to add documents to acollection in MongoDB.

If you attempt to add documents to a collection that does not exist, MongoDB will create the collection for you.

Prerequisites

Follow the Connect to MongoDB step to connect to a running MongoDB instance and declare and define the variable _database to access the test database.

Include the following using statements.

using System;
using System.Threading.Tasks;
using MongoDB.Bson;

Insert a Document

Insert a document into a collection named restaurants.

The operation will create the collection if the collection does not currently exist.

private async void button1_Click(object sender, EventArgs e)
        {
            MongoClient = new MongoClient();
            //根据名字获取数据库
            MongoDatabase = MongoClient.GetDatabase("test");

            var document = new BsonDocument
            {
                {
                    "address", new BsonDocument
                    {
                        {"street", "2 Avenue"},
                        {"zipcode", "10075"},
                        {"building", "1480"},
                        {"coord", new BsonArray {73.9557413, 40.7720266}}
                    }
                },
                {"borough", "Manhattan"},
                {"cuisine", "Italian"},
                {
                    "grades", new BsonArray
                    {
                        new BsonDocument
                        {
                            {"date", new DateTime(2014, 10, 1, 0, 0, 0, DateTimeKind.Utc)},
                            {"grade", "A"},
                            {"score", 11}
                        },
                        new BsonDocument
                        {
                            {"date", new DateTime(2014, 1, 6, 0, 0, 0, DateTimeKind.Utc)},
                            {"grade", "B"},
                            {"score", 17}
                        }
                    }
                },
                {"name", "Vella"},
                {"restaurant_id", "41704620"}
            };

            //根据名字获取collection
            var collection = MongoDatabase.GetCollection<BsonDocument>("restaurants");
            await collection.InsertOneAsync(document);
        }

The method does not return a result

If the document passed to the InsertOneAsync method does not contain the _id field, the driver automatically adds the field to the document and sets the field’s value to a generated ObjectId

Additional Information

n the C# Driver documentation, see InsertOneAsync, InsertManyAsync and BsonDocument.

In the MongoDB Manual, see also the Insert Documents tutorial.

SEE ALSO

The MongoDB Manual