MongoDB .NET驱动程序和文本搜索 [英] MongoDB .NET driver and text search

问题描述

我正在使用此MongoDB驱动程序: https://mongodb.github.io/mongo -csharp-driver/ 并且我想使用一个文本索引进行搜索，该索引(我认为)是在所有文本字段上创建的，如下所示:

I am using this MongoDB driver: https://mongodb.github.io/mongo-csharp-driver/ and I would like to search using a text index, which (I think) is created on all text fields like so:

{
    "_fts" : "text",
    "_ftsx" : 1
}

我正在使用linq查询来过滤数据，例如:

I am using linq queries to filter the data, example:

MongoClient client = new MongoClient(_mongoConnectionString);
IMongoDatabase mongoDatabase = client.GetDatabase(DatabaseName);
var aCollection = mongoDatabase.GetCollection<MyTypeSerializable>(CollectionName);

IMongoQueryable<MyTypeSerializable> queryable = aCollection.AsQueryable()
                .Where(e=> e.Field == 1);
var result = queryable.ToList();

如何使用这种方法来进行文本搜索?

How do I utilize the text search using this method?

推荐答案

在C#MongoDB驱动程序中的PredicateTranslator中，没有任何表达式可以转换为text查询.因此，您将无法使用linq查询来实现text查询.

Looking at the PredicateTranslator within the C# MongoDB driver there isn't any expression that gets converted in to a text query. So you won't be able to achive a text query using a linq query.

• 谓词.cs

• PredicateTranslator.cs
• PredicateTranslatorTests.cs

不过，您可以尝试使用Builder<>进行文本搜索:

However you could try just doing a text search with the Builder<>:

MongoClient client = new MongoClient(_mongoConnectionString);
IMongoDatabase mongoDatabase = client.GetDatabase(DatabaseName);
var aCollection = mongoDatabase.GetCollection<MyTypeSerializable>(CollectionName);

var cursor = await aCollection.FindAsync(Builders<MyTypeSerializable>.Filter.Text("search"));

var results = await cursor.ToListAsync();

有关文本过滤器的详细信息，请参见 https://docs.mongodb .com/manual/reference/operator/query/text/

Details about the text filter is here https://docs.mongodb.com/manual/reference/operator/query/text/

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