使用正则表达式 mongo c# 在列表中查找

Question

我可以在一个函数中执行此操作，还是可以通过一个查询的更短方式来执行此操作？我正在尝试使用正则表达式接收电子邮件，但我需要检查列表中的每封电子邮件。

public ObjectId? GetEntityIdByEmail(string email)
{
    var projection = Builders<Entity>.Projection.Include(x=>x._id);
    var filter = Builders<Entity>.Filter.Regex("Email", new BsonRegularExpression(new Regex(email, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace)));
    var id = _entitiesStorage.SelectAsSingleOrDefault(filter,projection);
    if (id == null)
        return null;
    return (ObjectId)id["_id"];
}

public List<ObjectId> GetEntitiesIdsByEmail(IList<string> emails)
{
    var result = new List<ObjectId>();
    foreach (var email in emails)
    {
        var id = GetEntityIdByEmail(email);
        if (id != null)
            result.Add(id.Value);
    }
    return result;
}

Answer 1

您可以扩展正则表达式查询

public async Task<List<ObjectId>> GetEntitiesIdsByEmail(IList<string> emails)
{
     var regexFilter = "(" + string.Join("|", emails) + ")";
     var projection = Builders<Entity>.Projection.Include(x => x.Id);
     var filter = Builders<Entity>.Filter.Regex("Email",
           new BsonRegularExpression(new Regex(regexFilter, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace)));
     var entities = await GetCollection().Find(filter).Project(projection).ToListAsync();
     return entities.Select(x=>x["_id"].AsObjectId).ToList();
}

使用正则表达式 mongo c# 在列表中查找

use regex mongo c# to find in list

c#

regex

driver

mongodb