NoSQL非关系型数据库支持CAP定理和最终一致性的特性，所以分布式系统中可以完美的结合，提高性能。

第一步：

新建项目

NuGet管理引入了 “MongoDB.Driver"；官方链接：http://mongodb.github.io/mongo-csharp-driver/

 

第二步：

实例化连接

// To directly connect to a single MongoDB server
// (this will not auto-discover the primary even if it's a member of a replica set)
var client = new MongoClient();

// or use a connection string
var client = new MongoClient("mongodb://localhost:27017");

// or, to connect to a replica set, with auto-discovery of the primary, supply a seed list of members
var client = new MongoClient("mongodb://localhost:27017,localhost:27018,localhost:27019");

 

第三步：

获取数据库

 _database = client.GetDatabase(databaseName);

第四步：增删改查操作

增：

var document = new MongoDBPostTest
{
    { "name", "MongoDB" },
    { "type", "Database" },
    { "count", 1 }   
};

collection.InsertOne(document);
await collection.InsertOneAsync(document);
批量加还可以collection.InsertMany(list);

删除：

 var collection = _database.GetCollection<T>(typeof(T).Name);
            var filter = Builders<T>.Filter.Lt("count", 100); //小于100
            var result = collection.DeleteOne(filter);

更改：

var filter = Builders<BsonDocument>.Filter.Eq("name", "zhangshan");
var update = Builders<MongoDBPostTest>.Update.Set("name", "zhangshan");
collection.UpdateOne(filter, update);
await collection.UpdateOneAsync(filter, update);

 

查询：

Find方法 四个方法重载

var data = collection.Find(new MongoDBPostTest()).ToList();
var data = await collection.Find(new MongoDBPostTest()).ToListAsync();

 

 排序

var filter = Builders<BsonDocument>.Filter.Exists("i");
var sort = Builders<BsonDocument>.Sort.Descending("i");
var data = collection.Find(filter).Sort(sort).First();

只要某个字段

var projection = Builders<BsonDocument>.Projection.Exclude("_id");
var data = collection.Find(new BsonDocument()).Project(projection).First();

过滤

var filter = Builders<MongoDBPostTest>.Filter.Eq("name", "MongoDB");
var data = collection.Find(filter).ToList();
50 < i <= 100：
var filter = filterBuilder.Gt("i", 50) & filterBuilder.Lte("i", 100);