[英]How to query inside Array in MongoDB Collection using C#?
我试图遍历形式的MongoDB集合:
{"_id":"lkashfhasdfhsdlafhlkjsdahf",
"
"Array":[{
"array_1":"17:00"}],
}
我想在上面的文档中获取array_1我在C#中使用以下代码尝试了它
result = Database.CollectionName.AsQueryable().Where(r => r.Array.array== array_inpit(Input) && condition2).ToList();
预期结果:所有具有匹配数组的文档
电流输出:错误
任何帮助我应该如何处理这个。
使用MongoDb.Driver包的基本示例。 您需要定义一些数据类型,例如:
// Use [BsonIgnoreExtraElements] attribute when not defining ALL fields in record
internal class MainRecord
{
public ObjectId _id { get; set; }
public List<ArrayItem> ResourceStatus { get; set; }
// All the other fields here
}
// [BsonIgnoreExtraElements] as above
internal class ArrayItem
{
public string E2EId { get; set; }
}
(注意 - 我省略了不需要进行数组搜索的所有字段)。
然后实际查询数据:
var client = new MongoClient();
IMongoDatabase db = client.GetDatabase("database-name-here");
var collectionName = "collection-name-here";
IMongoCollection<MainRecord> collection = db.GetCollection<MainRecord>(collectionName);
var filter = Builders<MainRecord>.Filter.ElemMatch(x => x.ResourceStatus, x => x.E2EId == "1fdsfsfsfsfsffds0");
var result = collection.Find(filter);
编辑:我建议看这篇文章 ,提供一些替代方法。
我创建简单的类,演示如何:
MongoDB类
public class MongoDBConnect : IDisposable
{
public IMongoClient client;
public IMongoDatabase database;
public MongoDBConnect()
{
client = new MongoClient("mongodb://localhost");
database = client.GetDatabase("dbo");
}
public void Dispose()
{
GC.WaitForPendingFinalizers();
GC.Collect();
}
}
你的收藏班
public class YourCollection
{
[BsonId()]
public ObjectId Id { get; set; }
[BsonElement("YourCollectionID")]
public string YourCollectionID { get; set; }
[BsonElement("AccessKey")]
public string AccessKey { get; set; }
}
您的收集数据类
public class YourCollectionDAO : MongoDBConnect
{
public YourCollectionDAO()
{
}
public YourCollection Find(string yourCollectionID)
{
var collection = this.database.GetCollection<User>("YourCollection");
Expression<Func<YourCollection, bool>> filter = x => x.yourCollectionID == yourCollectionID;
IList<YourCollection> filtering = collection.Find(filter).ToList();
var yourCollectionItem = filtering.Where(x => x.yourCollectionID == yourCollectionID).FirstOrDefault();
return yourCollectionItem;
}
}
希望能帮助到你。
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