如何创建包含$redact的c# mongodb管道

var client = new MongoClient("mongodb://localhost:27017");

var database = client.GetDatabase("your_database_name");
var collection = database.GetCollection<BsonDocument>("your_collection_name");

var pipeline = new BsonDocument[]
{
    BsonDocument.Parse("{ $redact: { $cond: { if: { $eq: ['$level', 'private'] }, then: '$$PRUNE', else: '$$DESCEND' } } }")
};

var result = collection.Aggregate<BsonDocument>(pipeline).ToList();

using MongoDB.Bson;
using MongoDB.Driver;

var client = new MongoClient("mongodb://localhost:27017");
var database = client.GetDatabase("your_database_name");
var collection = database.GetCollection<BsonDocument>("your_collection_name");

var pipeline = new BsonDocument[]
{
    BsonDocument.Parse("{ $redact: { $cond: { if: { $eq: ['$level', 'private'] }, then: '$$PRUNE', else: '$$DESCEND' } } }")
};

var result = collection.Aggregate<BsonDocument>(pipeline).ToList();