クイックリファレンス

このページでは、いくつかの MongoDB コマンドのドライバー構文を示し、それらに関連するリファレンスと API ドキュメントにリンクします。

Tip

LINQ の使用

LINQ を使用して、このページで多くの操作を実行できます。 .NET/C# ドライバーで LINQ を使用する方法の詳細については、「 LINQ の基礎ページ」を参照してください。

コマンド

構文

Find a Document

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Bagels N Buns");
var restaurant = _restaurantsCollection.Find(filter).FirstOrDefault();
Console.WriteLine(restaurant);

{ name : "Bagels N Buns", restaurant_id : "40363427", ... }

Find a Document (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Bagels N Buns");
var restaurant = await _restaurantsCollection.Find(filter).FirstOrDefaultAsync();
Console.WriteLine(restaurant);

{ name : "Bagels N Buns", restaurant_id : "40363427", ... }

Find Multiple Documents

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(r => restaurant.Cuisine, "Pizza");
var restaurants = _restaurantsCollection.Find(filter).ToList();
Console.WriteLine(restaurants);

[
  { name: "Como Pizza", cuisine: "Pizza", ... },
  { name: "New York Pizza Suprema", cuisine: "Pizza", ... },
  ...
]

Find Multiple Documents (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(r => restaurant.Cuisine, "Pizza");
var restaurants = await _restaurantsCollection.Find(filter).ToListAsync();
Console.WriteLine(restaurants);

[
  { name: "Como Pizza", cuisine: "Pizza", ... },
  { name: "New York Pizza Suprema", cuisine: "Pizza", ... },
  ...
]

Insert a Document

API Documentation
Usage Example
Fundamentals

var insertResult = _restaurantsCollection.InsertOne(new Restaurant { Name = "Mongo's Pizza" });

Insert a Document (Async)

API Documentation
Usage Example
Fundamentals

var insertResult = await _restaurantsCollection.InsertOneAsync(new Restaurant { Name = "Mongo's Pizza" });

Insert Multiple Documents

API Documentation
Usage Example
Fundamentals

_restaurantsCollection.InsertMany(new List<Restaurant>
{
    new Restaurant { Name = "Mongo's Pizza" },
    new Restaurant { Name = "Mongo Grill" }
});

Insert Multiple Documents (Async)

API Documentation
Usage Example
Fundamentals

await _restaurantsCollection.InsertManyAsync(new List<Restaurant>
{
    new Restaurant { Name = "Mongo's Pizza" },
    new Restaurant { Name = "Mongo Grill" }
});

Update a Document

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Bagels N Buns");
var update = Builders<Restaurant>.Update
  .Set(restaurant => restaurant.Name, "2 Bagels 2 Buns");
var result = _restaurantsCollection.UpdateOne(filter, update);

Update a Document (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Bagels N Buns");
var update = Builders<Restaurant>.Update
  .Set(restaurant => restaurant.Name, "2 Bagels 2 Buns");
var updateResult = await _restaurantsCollection.UpdateOneAsync(filter, update);

Update Multiple Documents

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Pizza");
var update = Builders<Restaurant>.Update
  .Set(restaurant => restaurant.Cuisine, "Pasta and breadsticks");
var result = _restaurantsCollection.UpdateMany(filter, update);

Update Multiple Documents (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Pizza");
var update = Builders<Restaurant>.Update
  .Set(restaurant => restaurant.Cuisine, "Pasta and breadsticks");
var updateResult = await _restaurantsCollection.UpdateManyAsync(filter, update);

Update an Array in a Document

API Documentation
Fundamentals (Update One)
Fundamentals (Update Many)

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Bagels N Buns");
var update = Builders<Restaurant>.Update
  .Push(restaurant => restaurant.Grades, new GradeEntry
  {
    Date = DateTime.Now.ToUniversalTime(),
    Grade = "A",
    Score = 10
  });
var result = _restaurantsCollection.UpdateOne(filter, update);

Replace a Document

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Pizza");
// Find ID of first pizza restaurant
var oldPizzaRestaurant = _restaurantsCollection.Find(filter).First();
var oldId = oldPizzaRestaurant.Id;
Restaurant newPizzaRestaurant = new()
{
    Id = oldId,
    Name = "Mongo's Pizza",
    Cuisine = "Pizza",
    Address = new Address
    {
        Building = "123",
        Coordinates = [123, 456],
        Street = "Pizza St",
        ZipCode = "10003"
    },
    Borough = "Manhattan",
};
var replaceResult = _restaurantsCollection.ReplaceOne(filter, newPizzaRestaurant);

Replace a Document (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Pizza");
// Find ID of first pizza restaurant
var oldPizzaRestaurant = _restaurantsCollection.Find(filter).First();
var oldId = oldPizzaRestaurant.Id;
Restaurant newPizzaRestaurant = new()
{
    Id = oldId,
    Name = "Mongo's Pizza",
    Cuisine = "Pizza",
    Address = new Address
    {
        Building = "123",
        Coordinates = [12.3, 45.6],
        Street = "Pizza St",
        ZipCode = "10003"
    },
    Borough = "Manhattan",
};
var replaceResult = await _restaurantsCollection.ReplaceOneAsync(filter, newPizzaRestaurant);

Delete a Document

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Ready Penny Inn");
var deleteResult = _restaurantsCollection.DeleteOne(filter);

Delete a Document (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Name, "Ready Penny Inn");
var deleteResult = await _restaurantsCollection.DeleteOneAsync(filter);

Delete Multiple Documents

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Regex(restaurant => restaurant.Name, "Green");
var deleteResult = _restaurantsCollection.DeleteMany(filter);

Delete Multiple Documents (Async)

API Documentation
Usage Example
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Regex(restaurant => restaurant.Name, "Green");
var deleteResult = await _restaurantsCollection.DeleteManyAsync(filter);

Access Data from a Cursor Iteratively

API Documentation

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Afghan)";
var cursor = _restaurantsCollection.Find(filter).ToCursor();
while (cursor.MoveNext())
{
    foreach (var r in cursor.Current)
    {
        Console.WriteLine(r.Name);
    }
}

[
  Afghan Kebab House
  Khyber Pass
  ...
]

Count Documents

API Documentation

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Pizza");
var count = _restaurantsCollection.Find(filter).CountDocuments();
Console.WriteLine(count);

List the Distinct Documents or Field Values

API Documentation

var filter = Builders<Restaurant>.Filter.Empty;
var restaurants = _restaurantsCollection
  .Distinct(r => r.Cuisine, filter);
Console.WriteLine(restaurants);

[ Afghan, African, American, Armenian, Asian, ... ]

Limit the Number of Documents Retrieved

API Documentation

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Asian");
var restaurants = _restaurantsCollection.Find(filter).Limit(3).ToList();
Console.WriteLine(restaurants);

[
  { name: "China Grill", ... },
  { name: "Indo Chine", ... },
  { name: "Le Colonial", ... }
]

Skip Retrieved Documents

API Documentation

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Asian");
var restaurants = _restaurantsCollection.Find(filter).Skip(2).ToList();
Console.WriteLine(restaurants);

[
  { name: "Le Colonial", ... },
  { name: "Citrus Bar & Grill", ... },
  { name: "Mangez Avec Moi", ... },
  ...
]

Sort the Documents When Retrieving Them

API Documentation

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Brazilian");
var restaurants =  _restaurantsCollection.Find(filter)
  .SortBy(r => r.Name).ToList();
Console.WriteLine(restaurants);

[
  { name: "Barzinho", ... },
  { name: "Beco", ... },
  { name: "Beija-Flor", ... },
  ...
]

Project Document Fields When Retrieving Them

API Documentation
Fundamentals

var filter = Builders<Restaurant>.Filter
  .Eq(restaurant => restaurant.Cuisine, "Italian");
var projection = Builders<Restaurant>.Projection
  .Include(restaurant => restaurant.Name)
  .Include(restaurant => restaurant.Borough)
  .Exclude(restaurant => restaurant.Id);
var restaurants = _restaurantsCollection.Find(filter).Project(projection).ToList();
Console.WriteLine(restaurants);

[
  { borough : "Brooklyn", name : "Philadelphia Grille Express" }
  { borough : "Manhattan", name : "Isle Of Capri Restaurant" }
  { borough : "Manhattan", name : "Marchis Restaurant" }
  ...
]

Create an Index

API Documentation
Fundamentals

var index = Builders<Restaurant>.IndexKeys
  .Ascending(restaurant => restaurant.Cuisine);
_restaurantsCollection.Indexes
  .CreateOne(new CreateIndexModel<Restaurant>(index));

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