对于 AI 代理：可在 https://www.mongodb.com/zh-cn/docs/llms.txt 获取文档索引—通过在任何 URL 路径后添加 .md 可获取所有页面的 Markdown 版本。

快速参考

本页显示了若干 MongoDB 命令的驱动程序语法，以及指向相关引用和 API 文档的链接。

提示

使用 LINQ

您可以使用 LINQ 执行此页面上的许多操作。有关将 LINQ 与 .NET/C# 驱动程序一起使用的更多信息，请参阅 LINQ 基础知识页面。

命令
语法
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", ... }

查找文档（异步）

API 文档
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", ... }

查找多个文档

API 文档
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", ... },  ...]

查找多个文档（异步）

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

插入文档（异步）

API 文档
Fundamentals

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

插入多个文档

API 文档
Fundamentals

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

插入多个文档（异步）

API 文档
Fundamentals

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

更新文档（异步）

API 文档
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);

更新多个文档

API 文档
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);

更新多个文档（异步）

API 文档
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);
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);
var filter = Builders<Restaurant>.Filter  .Eq(restaurant => restaurant.Cuisine, "Pizza");
// Find ID of first pizza restaurantvar 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);

替换文档（异步）

API 文档
Fundamentals

var filter = Builders<Restaurant>.Filter  .Eq(restaurant => restaurant.Cuisine, "Pizza");
// Find ID of first pizza restaurantvar 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);
var filter = Builders<Restaurant>.Filter  .Eq(restaurant => restaurant.Name, "Ready Penny Inn");
var deleteResult = _restaurantsCollection.DeleteOne(filter);

删除文档（异步）

API 文档
Fundamentals

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

删除多个文档

API 文档
Fundamentals

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

删除多个文档（异步）

API 文档
Fundamentals

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

从游标迭代访问数据

API 文档

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  ...]

计算文档

API 文档

var filter = Builders<Restaurant>.Filter  .Eq(restaurant => restaurant.Cuisine, "Pizza");
var count = _restaurantsCollection.Find(filter).CountDocuments();
Console.WriteLine(count);
1163

列出不同的文档或字段值

API 文档

var filter = Builders<Restaurant>.Filter.Empty;var restaurants = _restaurantsCollection  .Distinct(r => r.Cuisine, filter);
Console.WriteLine(restaurants);
[ Afghan, African, American, Armenian, Asian, ... ]

限制检索的文档数量

API 文档

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", ... }]

跳过检索到的文档

API 文档

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", ... },  ...]

检索文档时对文档进行排序

API 文档

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", ... },  ...]

检索项目文档字段时

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