Using MONGO official drive operation MONGO Database

First to https://github.com/mongodb/mongo-csharp-driver/downloads download MONGO official driver

Refer to the project when the download is complete

     Public  classConnhelp { Public Static stringConnectionString ="Mongodb://127.0.0.1:27017/qiao";  Public Staticmongodatabase getdatabasefromurl (mongourl url) {varClient =Newmongoclient (URL); varServer =client.            Getserver (); returnserver. Getdatabase (URL.        DatabaseName); }         Public StaticMongodatabase getdatabasefromconnectionstring (stringConnectionString) {            returnGetdatabasefromurl (NewMongourl (connectionstring)); }         Public StaticMongocollection<t> getcollection<t> (stringCollectionName) {            returnGetdatabasefromconnectionstring (ConnectionString). Getcollection<t>(CollectionName); }    }

usingMongodb.bson;usingMongodb.driver;usingMongoDB.Driver.Builders;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespacemognolearn{classProgram {Static voidMain (string[] args) {mongocollection<aa> TT = connhelp.getcollection<aa> ("AA"); //list<aa> = TT. FindAll (). ToList ();            varquery = Query.and (QUERY&LT;AA&GT;. EQ (x = X.name,"Zhang San")); //{"name": "Zhang San"}list<aa> LL = tt. Find (query). ToList ();//to return data based on the criteria of querylist<aa> list = TT. FindAll (). ToList ();//querying all of the datalist<string> str =Newlist<string>(); Str. ADD ("Zhang San"); Str. ADD ("John Doe"); Query=Query.and (Query<aa>. In (x=>x.name,str)); //{"name": {"$in": ["Zhang San", "John Doe"]}}List =TT. Find (query).                        ToList (); //aggregating an inline document books in a database//If you need to filter out some data, write the filter in this place .//var match = new Bsondocument//{             //    {             //"$match",//query. Tobsondocument ()//    }             //};            varUnwind =Newbsondocument {{"$unwind",                    "$books"                }            }; //unwind can also write some filters to filter out some data that may not be needed after splitting.            varGroup =Newbsondocument {{"$group",                                            Newbsondocument {{"_id",Newbsondocument {{"Books","$books. Name" },                                 { " Money","$money" }                             }                         },                         {                             "Count",Newbsondocument {{"$sum",1}                             }                         }                    }                }            }; Aggregateresult Use=TT.            Aggregate (unwind, group); varSttr = use. Response.tolist () [0].            Value; //{[{"_id": {"Books": "Creature"}, "Count": 1}, {"_id": {"Books": "Geography"}, "Count": 1}, {"_id": {"Books": "Chemistry" }, "Count": 4},
{"_id": {"Books": "English"}, "Count": 2}, {"_id": {"Books": "Language"}, "Count": 7}, {"_id": {"books": "Math"}, "C Ount ": 2}, {" _id ": {" books ":" Mongo authoritative Guide "}," Count ": 1}]}Console.ReadLine (); }    }}

namespacemognolearn{ Public classAA {//[Bsonid][Bsonrepresentation (Bsontype.objectid)] Public stringID {Get;Set; }  Public stringName {Get;Set; }  PublicList<book> Books {Get;Set; } //[Bsondatetimeoptions (Kind = datetimekind.local)]//Public DateTime Addtime {get; set;}    }     Public classBook { Public stringName {Get;Set; }  Public DoubleMoney {Get;Set; }  Public intPage {Get;Set; } }}

Using MONGO official drive operation MONGO Database