Question

您好我正在尝试使用泛型方法从数据库中返回单个值我不确定将返回结果放在何处，将值作为BSON文档返回。我需要1个值....

    public static string SearchMongoSingleValue(string key, string value, string ducument, string datatable)
     {
         var connectionString = "mongodb://localhost";
         var client = new MongoClient(connectionString);
         var server = client.GetServer();
         var database = server.GetDatabase(datatable);
         var collection = database.GetCollection(ducument);
         var query = Query.EQ(key, value);
         var oneDocument = collection.FindOne(query);

         return oneDocument[value];

由于

Answer 1

我认为您需要oneDocument[key]而不是oneDocument[value]。刚刚测试了这段代码：

using MongoDB.Driver;
using MongoDB.Bson;
using MongoDB.Driver.Builders;
var client = new MongoClient("mongodb://localhost");
var coll = client.GetServer().GetDatabase("local").GetCollection("test1");
var doc = new BsonDocument();
doc.Add("Name","John");
doc.Add("Color","Red");
coll.Insert(doc);
var query = Query.EQ("Name", "John");
var doc2 = coll.FindOne(query);
var value = doc2["Color"];

它返回"Red"好吧

返回来自mongo doc的单个结果

1 个答案: