ANNOUNCEMENTVoyage AI joins MongoDB to power more accurate and trustworthy AI applications on Atlas. Learn more >Voyage AI joins MongoDB to power more accurate and trustworthy AI applications on Atlas. >>

NEWSLearn why MongoDB was named a leader in the 2024 Gartner® Magic Quadrant™ Read the report >Learn why MongoDB was named a leader in the 2024 Gartner® Magic Quadrant™ >>

NEWMongoDB 8.0: Experience unmatched speed and performance. Check it out >MongoDB 8.0: Experience unmatched speed and performance. >>

MongoDB Language Series

MongoDB: The modern database for C#

Get the versatility and flexibility of MongoDB Atlas with the familiarity of C#. Accelerate development with a first-class developer experience.

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Write strongly-typed queries natively

Construct queries using idiomatic builders — no need to learn a new query language. MongoDB supports LINQ operators, so you can get the data you need with the syntax you know.

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Manipulate data using the tools of your choice

Easily work with your data using extensions for VS Code and Visual Studio. Browse your databases, prototype queries, and aggregations with dynamic playgrounds, and query data directly from your IDE.

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Build C# apps for native platforms using the Atlas Device SDK for .NET

Build scalable, high-performing mobile apps and games on MAUI and Unity with the Atlas Device .NET SDK. Streamline development with built-in data sync, automate app logic with Atlas Device Sync, and more.

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Unlock the full power of MongoDB directly within your EF Core projects

Enhance development with the MongoDB Provider for Entity Framework Core. Build modern, scalable applications using familiar APIs and avoid cloud vendor lock-in.

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MongoDB Atlas
and C# in action

Learn how you can deploy key MongoDB Atlas features — from aggregation pipelines to data encryption — using C# syntax. Helpful code snippets are included for easy copy and paste.

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Connect to MongoDB Atlas with the C# driver

Use the officially supported MongoDB C# driver to connect to your MongoDB Atlas cluster and start querying data instantly.

MongoDB C# Driver

Write aggregation pipelines in LINQ

Transform and process your data with MongoDB’s modular, multi-stage aggregation framework. Easily customize and configure your data analysis using familiar LINQ expressions and syntax.

LINQ

Programmatically encrypt key data

Add an extra layer of security with client-side field level encryption (CSFLE). Enable CSFLE on the MongoClient and encrypt fields with a JSON schema so sensitive data is never transmitted unencrypted nor seen unencrypted by the MongoDB server.

Client-side field level encryption

Connect to MongoDB Atlas with the C# driver

Use the officially supported MongoDB C# driver to connect to your MongoDB Atlas cluster and start querying data instantly.

MongoDB C# Driver

Database.cs

Code Snippet

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using MongoDB.Bson;using MongoDB.Driver;// Replace the uri string with your MongoDB deployment's connection string.var client = new MongoClient(   "mongodb+srv://<username>:<password>@<cluster-address>/test?w=majority");var database = client.GetDatabase("test");

Write aggregation pipelines in LINQ

Transform and process your data with MongoDB’s modular, multi-stage aggregation framework. Easily customize and configure your data analysis using familiar LINQ expressions and syntax.

LINQ

Code Snippet

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// Return largest and smallest cities by statevar pipeline =   from o in   (       from z in __collection.AsQueryable()       group z by new { z.State, z.City } into g       select new { StateAndCity = g.Key, Population = g.Sum(x => x.Population) }   )   orderby o.Population   group o by o.StateAndCity.State into g   orderby g.Key   select new   {       State = g.Key,       BiggestCity = new { Name = g.Last().StateAndCity.City, Population = g.Last().Population },       SmallestCity = new { Name = g.First().StateAndCity.City, Population = g.First().Population }   }; var result = await pipeline.ToListAsync();

Programmatically encrypt key data

Client-side field level encryption

JsonSchemaCreator.cs

EncryptedClient.cs

Code Snippet

using MongoDB.Bson;

public static class JsonSchemaCreator
{
    private static readonly string DETERMINISTIC_ENCRYPTION_TYPE = "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic";

public static BsonDocument CreateJsonSchema(string keyId)
    {
        return new BsonDocument
        {
            { "bsonType", "object" },
            { "encryptMetadata", CreateEncryptMetadata(keyId) },
            {
                "properties",
                new BsonDocument
                {
                    {  
                        "ssn",
                        new BsonDocument
                        {
                            {
                                "encrypt",
                                new BsonDocument
                                {
                                    { "bsonType", "int" },
                                    { "algorithm", DETERMINISTIC_ENCRYPTION_TYPE }
                                }
                            }
                        }
                    }
                }
            }
        };
    }
}

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using MongoDB.Bson;​public static class JsonSchemaCreator{    private static readonly string DETERMINISTIC_ENCRYPTION_TYPE = "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic";​    public static BsonDocument CreateJsonSchema(string keyId)    {        return new BsonDocument        {            { "bsonType", "object" },            { "encryptMetadata", CreateEncryptMetadata(keyId) },            {                "properties",                new BsonDocument                {                    {                          "ssn",                        new BsonDocument                        {                            {                                "encrypt",                                new BsonDocument                                {                                    { "bsonType", "int" },                                    { "algorithm", DETERMINISTIC_ENCRYPTION_TYPE }                                }                            }

Database.cs

Code Snippet

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using MongoDB.Bson;
using MongoDB.Driver;
// Replace the uri string with your MongoDB deployment's connection string.
var client = new MongoClient(
   "mongodb+srv://<username>:<password>@<cluster-address>/test?w=majority"
);
var database = client.GetDatabase("test");

Boost Developer Productivity with the MongoDB Analyzer for .NET

The MongoDB Analyzer for .NET improves productivity for C# developers by reducing the pain of debugging queries. It quickly identifies when unsupported Builders or LINQ expressions are being used in your applications, enabling you to identify and fix any errors prior to runtime.

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