[英]Update an Embedded Field using MongoDb and C#
我有這個文件
{ "_id" : ObjectId("57f65ed25ced690b5408a9d1"), "fbId" : "7854", "Name" : "user1", "pass" : "user1", "Watchtbl" : [ { "wid" : "745", "name" : "azs", "Symboles" : [ { "Name" : "nbv" } ] }, { "wid" : "8965", "name" : "bought stock1", "Symboles" : [ { "Name" : "AAA" }, { "Name" : "BSI" }, { "Name" : "EXXI" }, { "Name" : "AMD" } ] }, { "wid" : "9632", "name" : "bought stock3", "Symboles" : [ { "Name" : "AAA" }, { "Name" : "AMD" } ] } ] }
我嘗試通過_id和Watchtbl.wid搜索並更新Watchtbl.name和Watchtbl.Symboles,所以我嘗試僅以name開頭,這是我的代碼:
var collectionWatchtbl = _database.GetCollection<BsonDocument>("UsersWatchtbls");
var filter = Builders<BsonDocument>.Filter.Eq("_id", id) & Builders<BsonDocument>.Filter.Eq("Watchtbl.wid", wid );
var update = Builders<BsonDocument>.Update.Set("Watchtbl.name", NameComboBox.SelectedItem.ToString());
var result = await collectionWatchtbl.UpdateOneAsync(filter, update);
但是什么也沒有發生,即使沒有錯誤。 而且,如果我嘗試更新Watchtbl.Symboles,則必須執行兩次相同的代碼,沒有其他方法可以同時更新所有代碼。
解決方案,其中一項需要更新
BsonArray arrSym = new BsonArray();
foreach (var item in SymbolesListBox.SelectedItems)
{
arrSym.Add(new BsonDocument("Name", item.ToString()));
}
var filter = Builders<UserWatchTblCls>.Filter.Where(x=> x.Id == ObjectId.Parse(id) && x.WatchTbls.Any(i=> i.WID == wid) );
var update = Builders<UserWatchTblCls>.Update.Set(x=> x.WatchTbls[-1].Name, NameComboBox.SelectedItem.ToString()).Set(x => x.WatchTbls[-1].Symbols, arrSym);
await collectionWatchtbl.UpdateManyAsync(filter, update);
如果我刪除此部分,將可以工作並更新名稱,
.Set(x => x.WatchTbls[-1].Symbols, arrSym)
但是我需要更新符號,然后出現此錯誤
嚴重性代碼說明項目文件行抑制狀態錯誤CS1660無法將lambda表達式轉換為類型“ FieldDefinition”,因為它不是委托類型FinalWatchTbl C:\\ Users \\ amin- \\ Desktop \\ FinalWatchTbl \\ FinalWatchTbl \\ UpdateFrm.cs 117有效
解決方案如果我需要將bson Array更新為嵌套文檔,則可以使用
“ Watchtbl。$。Symboles”,因此解決方案是:
BsonArray arrSym = new BsonArray();
var filter = Builders<UserWatchTblCls>.Filter.Where(x => x.Id == ObjectId.Parse(id) && x.WatchTbls.Any(i => i.WID == wid));
var update = Builders<UserWatchTblCls>.Update.Set(x => x.WatchTbls[-1].Name, NameComboBox.SelectedItem.ToString()).Set("Watchtbl.$.Symboles", arrSym);
//var update = Builders<UserWatchTblCls>.Update.Set("Watchtbl.$.Symboles", arrSym);
await collectionWatchtbl.UpdateManyAsync(filter, update);
查找如何使用位置運算符更新數組中的文檔 。
// string id, int wid ...
var fdb = Builders<BsonDocument>.Filter;
var udb = Builders<BsonDocument>.Update;
var filter = fdb.Eq("_id", id) & fdb.ElemMatch ("watchtbl", fdb.Eq ("wid", wid));
var update = udb.Set("watchtbl.$.name", name);
collectionWatchtbl.UpdateOne(filter, update);
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