Update mongodb

Src/Asp.NetCore2/MongoDb.Ado.data/ExecuteDbDataReaderItemsAsync/QueryAggregateHandlerAsync.cs

@@ -0,0 +1,28 @@
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization;
+using MongoDB.Driver;
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MongoDb.Ado.data
+{
+    public class QueryAggregateHandlerAsync : IQueryHandlerAsync
+    {
+        public async Task<DbDataReader> HandlerAsync(IMongoCollection<BsonDocument> collection, BsonValue doc)
+        {
+            // 解析 JSON 字符串为 BsonArray
+            var pipeline =  doc.AsBsonArray; ;
+
+            // 构建聚合管道
+            var aggregateFluent = collection.Aggregate<BsonDocument>(pipeline.Select(stage => new BsonDocument(stage.AsBsonDocument)).ToArray());
+
+            // 执行聚合查询并返回 DbDataReader
+            var cursor =await aggregateFluent.ToListAsync();
+            return new MongoDbBsonDocumentDataReader(cursor);
+        }
+    }
+}