C#驱动程序不工作时查询mongodb

在从internet粘贴示例以查询mongodb并查找字段时，我遇到以下错误

我看不出我做错了什么，如果不能很快解决问题，我想我会回到SQL：(

我只想说给我找三门车

谢谢你的帮助！非常感谢

连接代码

public MongoDatabase GetDatabase
{
    get
    {
        MongoClient mc = new MongoClient();
        var server = mc.GetServer();
        return server.GetDatabase("players");
    }
 }

var numberOfDoors = 3;

var collection = GetDatabase.GetCollection<CarCollection>("Cars");

// Have tried using my Car object instead of BsonDocument but little difference
var filter = Builders<BsonDocument>.Filter.Eq("NumberOfDoors", numberOfDoors);

var result = collection.Find(filter);

Argument 1: cannot convert from 'MongoDB.Driver.FilterDefinition<MongoDB.Bson.BsonDocument>' to 'MongoDB.Driver.IMongoQuery'

{
    "_id" : ObjectId("..."),
    "Members" : [ 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }
    ]
}

public class MemberCollection
{
    public ObjectId _id { get; set; }

    public MemberEntity[] Members { get; set; }
}

public class MemberEntity
{
    public int _id { get; set; }

    public string Password { get; set; }

    public string EmailAddress { get; set; }
}

代码示例

public MongoDatabase GetDatabase
{
    get
    {
        MongoClient mc = new MongoClient();
        var server = mc.GetServer();
        return server.GetDatabase("players");
    }
 }

var numberOfDoors = 3;

var collection = GetDatabase.GetCollection<CarCollection>("Cars");

// Have tried using my Car object instead of BsonDocument but little difference
var filter = Builders<BsonDocument>.Filter.Eq("NumberOfDoors", numberOfDoors);

var result = collection.Find(filter);

Argument 1: cannot convert from 'MongoDB.Driver.FilterDefinition<MongoDB.Bson.BsonDocument>' to 'MongoDB.Driver.IMongoQuery'

{
    "_id" : ObjectId("..."),
    "Members" : [ 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }
    ]
}

public class MemberCollection
{
    public ObjectId _id { get; set; }

    public MemberEntity[] Members { get; set; }
}

public class MemberEntity
{
    public int _id { get; set; }

    public string Password { get; set; }

    public string EmailAddress { get; set; }
}

C#结构

public MongoDatabase GetDatabase
{
    get
    {
        MongoClient mc = new MongoClient();
        var server = mc.GetServer();
        return server.GetDatabase("players");
    }
 }

var numberOfDoors = 3;

var collection = GetDatabase.GetCollection<CarCollection>("Cars");

// Have tried using my Car object instead of BsonDocument but little difference
var filter = Builders<BsonDocument>.Filter.Eq("NumberOfDoors", numberOfDoors);

var result = collection.Find(filter);

Argument 1: cannot convert from 'MongoDB.Driver.FilterDefinition<MongoDB.Bson.BsonDocument>' to 'MongoDB.Driver.IMongoQuery'

{
    "_id" : ObjectId("..."),
    "Members" : [ 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }
    ]
}

public class MemberCollection
{
    public ObjectId _id { get; set; }

    public MemberEntity[] Members { get; set; }
}

public class MemberEntity
{
    public int _id { get; set; }

    public string Password { get; set; }

    public string EmailAddress { get; set; }
}

更新-显示错误消息

public MongoDatabase GetDatabase
{
    get
    {
        MongoClient mc = new MongoClient();
        var server = mc.GetServer();
        return server.GetDatabase("players");
    }
 }

var numberOfDoors = 3;

var collection = GetDatabase.GetCollection<CarCollection>("Cars");

// Have tried using my Car object instead of BsonDocument but little difference
var filter = Builders<BsonDocument>.Filter.Eq("NumberOfDoors", numberOfDoors);

var result = collection.Find(filter);

Argument 1: cannot convert from 'MongoDB.Driver.FilterDefinition<MongoDB.Bson.BsonDocument>' to 'MongoDB.Driver.IMongoQuery'

{
    "_id" : ObjectId("..."),
    "Members" : [ 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }
    ]
}

public class MemberCollection
{
    public ObjectId _id { get; set; }

    public MemberEntity[] Members { get; set; }
}

public class MemberEntity
{
    public int _id { get; set; }

    public string Password { get; set; }

    public string EmailAddress { get; set; }
}

文档结构

public MongoDatabase GetDatabase
{
    get
    {
        MongoClient mc = new MongoClient();
        var server = mc.GetServer();
        return server.GetDatabase("players");
    }
 }

var numberOfDoors = 3;

var collection = GetDatabase.GetCollection<CarCollection>("Cars");

// Have tried using my Car object instead of BsonDocument but little difference
var filter = Builders<BsonDocument>.Filter.Eq("NumberOfDoors", numberOfDoors);

var result = collection.Find(filter);

Argument 1: cannot convert from 'MongoDB.Driver.FilterDefinition<MongoDB.Bson.BsonDocument>' to 'MongoDB.Driver.IMongoQuery'

{
    "_id" : ObjectId("..."),
    "Members" : [ 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }, 
        {
            "EmailAddress" : "",
            ...
        }
    ]
}

public class MemberCollection
{
    public ObjectId _id { get; set; }

    public MemberEntity[] Members { get; set; }
}

public class MemberEntity
{
    public int _id { get; set; }

    public string Password { get; set; }

    public string EmailAddress { get; set; }
}

更新#2

更新3

---

您使用的

Builders.Filter.Eq（）

不正确：

var numberOfDoors = 3;

var collection = ..GetCollection<CarCollection>("Cars");

var builder = Builders<CarCollection>.Filter;
var filt = builder.Where(car => car.NumberOfDoors == numberOfDoors);
var list = await collection.Find(filt).ToListAsync();

---

你的底线错了

Builders<BsonDocument>.Filter.Eq("NumberOfDoors", numberOfDoors);

根据您最近的编辑，您应该将过滤器定义更改为以下，因为您实际上正在尝试将过滤器放置在

成员

对象的嵌套数组上

var filter = Builders<MemberCollection>.Filter.Eq("Members.EmailAddress", emailAddress);

编辑：

不确定你的目的出了什么问题，但试一下如下

var collection = _mongoclientProvider.GetDatabase.GetCollection<MemberCollection>("Members");
Expression<Func<MemberCollection, bool>> expression = mc => mc.Members.Any(m => m.EmailAddress == emailAddress);
var list = collection.Find(expression).ToList();

var collection=\u mongoclientProvider.GetDatabase.GetCollection（“成员”）；
Expression=mc=>mc.Members.Any（m=>m.EmailAddress==EmailAddress）；
var list=collection.Find（expression.ToList（）；

谢谢，我已经删除了wait并改为ToList，因为该方法目前没有使用任务调用，但我仍然得到相同的结果error@Jamie你的收藏怎么样？@Jamie看到编辑了，抱歉！刚刚看到我的错误。

var filt

行已更改。不知道你可以使用

.Eq（字符串，字符串）

！提供了新的更新，但仍然得到相同的更新problem@Jamie，请参阅答案中的最终编辑，并告知是否有帮助。@Jamie，将此部分

Expression

更改为

Expression

FWIW：确保您没有在生产数据库中以明文形式存储密码。当然，这只是一个POC，但thanks@Jamie-有你吗你找到任何解决方案。我有完全相同的问题。顺便说一句，我使用的是2.5.0版本的mongodb网络驱动程序。