我可以用mongodb c#驱动程序进行文本查询吗

Coll.find { "myrecs","$query : { x : 3, y : "abc" }, $orderby : { x : 1 } } ");

您不需要完全相同的功能。

但是您可以从json创建BsonDocument进行查询：

var jsonQuery = "{ x : 3, y : 'abc' }";
BsonDocument doc = MongoDB.Bson.Serialization
                   .BsonSerializer.Deserialize<BsonDocument>(jsonQuery);

之后，您可以从BsonDocument:创建查询

var query = new QueryComplete(doc); // or probably Query.Wrap(doc);

您可以对排序表达式执行相同的操作：

var jsonOrder = "{ x : 1 }";
BsonDocument orderDoc = BsonSerializer.Deserialize<BsonDocument>(jsonQuery);
var sortExpr = new SortByWrapper(orderDoc);

您还可以为MongoCollection创建如下扩展方法：

public static List<T> GetItems<T>(this MongoCollection collection, string queryString, string orderString) where T : class 
{
    var queryDoc = BsonSerializer.Deserialize<BsonDocument>(queryString);
    var orderDoc = BsonSerializer.Deserialize<BsonDocument>(orderString);
    //as of version 1.8 you should use MongoDB.Driver.QueryDocument instead (thanks to @Erik Hunter)
    var query = new QueryComplete(queryDoc);
    var order = new SortByWrapper(orderDoc);
    var cursor = collection.FindAs<T>(query);
    cursor.SetSortOrder(order);
    return cursor.ToList();
}

我没有测试上面的代码。如果需要，稍后再做。

更新：

刚刚测试了上面的代码，它正在工作！

你可以这样使用它：

var server = MongoServer.Create("mongodb://localhost:27020");
var collection= server.GetDatabase("examples").GetCollection("SO");
var items = collection.GetItems<DocType>("{ x : 3, y : 'abc' }", "{ x : 1 }");

QueryComplete类似乎已被弃用。请改用MongoDB.Driver.QueryDocument。如下：

BsonDocument document = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>("{ name : value }");
QueryDocument queryDoc = new QueryDocument(document);
MongoCursor toReturn = collection.Find(queryDoc);

这是我编写的一个web服务函数，您可以发送它作为筛选查询、限制和跳过，用于分页，并为您想要的任何集合发送排序查询！它通用且快速。

    /// <summary>
    /// This method returns data from a collection specified by data type
    /// </summary>
    /// <param name="dataType"></param>
    /// <param name="filter">filter is a json specified filter. one or more separated by commas.  example: { "value":"23" }  example: { "enabled":true, "startdate":"2015-10-10"}</param>
    /// <param name="limit">limit and skip are for pagination, limit is the number of results per page</param>
    /// <param name="skip">skip is is the page size * page. so limit of 100 should use skip 0,100,200,300,400, etc. which represent page 1,2,3,4,5, etc</param>
    /// <param name="sort">specify which fields to sort and direction example:  { "value":1 }  for ascending, {"value:-1} for descending</param>
    /// <returns></returns>
    [WebMethod]
    public string GetData(string dataType, string filter, int limit, int skip, string sort) {
        //example: limit of 100 and skip of 0 returns the first 100 records
        //get bsondocument from a collection dynamically identified by datatype
        try {
            MongoCollection<BsonDocument> col = MongoDb.GetConnection("qis").GetCollection<BsonDocument>(dataType);
            if (col == null) {
                return "Error: Collection Not Found";
            }
            MongoCursor cursor = null;
            SortByWrapper sortExpr = null;
            //calc sort order
            try {
                BsonDocument orderDoc = BsonSerializer.Deserialize<BsonDocument>(sort);
                sortExpr = new SortByWrapper(orderDoc);
            } catch { }
            //create a query from the filter if one is specified
            try {
                if (filter != "") {
                    //sample filter: "{tags:'dog'},{enabled:true}"
                    BsonDocument query = BsonSerializer.Deserialize<BsonDocument>(filter);
                    QueryDocument queryDoc = new QueryDocument(query);
                    cursor = col.Find(queryDoc).SetSkip(skip).SetLimit(limit);
                    if (sortExpr != null) {
                        cursor.SetSortOrder(sortExpr);
                    }
                    return cursor.ToJson();
                }
            } catch{}

            //if no filter specified or the filter failed just return all
            cursor = col.FindAll().SetSkip(skip).SetLimit(limit);
            if (sortExpr != null) {
                cursor.SetSortOrder(sortExpr);
            }
            return cursor.ToJson();
        } catch(Exception ex) {
            return "Exception: " + ex.Message;
        }
    }

假设我的收藏中有这些记录，名为"mytest2"：

[{ "_id" : ObjectId("54ff7b1e5cc61604f0bc3016"), "timestamp" : "2015-01-10 10:10:10", "value" : "23" }, 
 { "_id" : ObjectId("54ff7b415cc61604f0bc3017"), "timestamp" : "2015-01-10 10:10:11", "value" : "24" }, 
 { "_id" : ObjectId("54ff7b485cc61604f0bc3018"), "timestamp" : "2015-01-10 10:10:12", "value" : "25" }, 
 { "_id" : ObjectId("54ff7b4f5cc61604f0bc3019"), "timestamp" : "2015-01-10 10:10:13", "value" : "26" }]

我可以使用以下参数进行web服务调用，以返回从第一页开始的100条记录，其中值>=23，值<=26，按降序排列

dataType: mytest2
filter: { value: {$gte: 23}, value: {$lte: 26} }
limit: 100
skip: 0
sort: { "value": -1 }

享受吧！

以下是我用于将字符串和.NET对象转换为BSON查询的一些例程（这是业务对象包装器的一部分，因此对该类有几个引用）：

    public QueryDocument GetQueryFromString(string jsonQuery)
    {
        return new QueryDocument(BsonSerializer.Deserialize<BsonDocument>(jsonQuery));
    }
    public IEnumerable<T> QueryFromString<T>(string jsonQuery, string collectionName = null)
    {
        if (string.IsNullOrEmpty(collectionName))
            collectionName = this.CollectionName;
        var query = GetQueryFromString(jsonQuery);            
        var items = Database.GetCollection<T>(collectionName).Find(query);
        return items as IEnumerable<T>;
    }

    public IEnumerable<T> QueryFromObject<T>(object queryObject, string collectionName = null)
    {
        if (string.IsNullOrEmpty(collectionName))
            collectionName = this.CollectionName;
        var query = new QueryDocument(queryObject.ToBsonDocument());
        var items = Database.GetCollection<T>(collectionName).Find(query);
        return items as IEnumerable<T>;
    }

使用这些可以很容易地通过字符串或对象parms进行查询：

var questionBus = new busQuestion();           
var json = "{ QuestionText: /elimination/, GroupName: '"Elimination'" }";
var questions = questionBus.QueryFromString<Question>(json);
foreach(var question in questions) { ... }

或使用对象语法：

var questionBus = new busQuestion();            
var query = new {QuestionText = new BsonRegularExpression("/elimination/"), 
                 GroupName = "Elimination"};
var questions = questionBus.QueryFromObject<Question>(query);
foreach(var question in questions) { ... }

我喜欢对象语法，因为用C#代码编写比手工编码JSON字符串中的嵌入引号更容易。

使用官方的C#驱动程序，您可以执行以下操作：

var server = MongoServer.Create("mongodb://localhost:27017");
var db = server.GetDatabase("mydb");
var col = db.GetCollection("col");
var query = Query.And(Query.EQ("x", 3), Query.EQ("y", "abc"));
var resultsCursor = col.Find(query).SetSortOrder("x");
var results = resultsCursor.ToList();

来自shell的等效查询是：

col.find({ x: 3, y: "abc" }).sort({ x: 1 })