如何使用Xamarin更新Parse.com數據庫中的對象？

Question

我有一個在線Parse.com數據庫，我可以創建對象並查詢它們但不更新。在Parse.com文檔的Xamarin部分，它只會告訴您如何在創建對象後直接更新對象，這是我不想做的。我嘗試調整文檔爲其他平臺所說的內容，但它沒有奏效，我也嘗試過查詢數據庫，然後直接輸入新的字段值，但它將它們視爲單獨的函數。有沒有人有任何幫助？

Parse.com文檔：

// Create the object. 
var gameScore = new ParseObject("GameScore") 
{ 
    { "score", 1337 }, 
    { "playerName", "Sean Plott" }, 
    { "cheatMode", false }, 
    { "skills", new List<string> { "pwnage", "flying" } }, 
}; 
await gameScore.SaveAsync(); 

// Now let's update it with some new data. In this case, only cheatMode 
// and score will get sent to the cloud. playerName hasn't changed. 
gameScore["cheatMode"] = true; 
gameScore["score"] = 1338; 
await gameScore.SaveAsync(); 

我試過最近：

ParseQuery<ParseObject> query = ParseObject.GetQuery("cust_tbl"); 
IEnumerable<ParseObject> customers = await query.FindAsync(); 
customers["user"] = admin; 
record["score"] = 1338; 
await record; 

Answer 1

在你的榜樣，你所得到的對象，而不是單個對象的列表（IEnumerable的）。相反，嘗試這樣的事情：

ParseQuery<ParseObject> query = ParseObject.GetQuery("cust_tbl"); 
// you need to keep track of the ObjectID assigned when you first saved, 
// otherwise you will have to query by some unique field like email or username 
ParseObject customer = await query.GetAsync(objectId); 

customer["user"] = admin; 
customer["score"] = 1338; 
await customer.SaveAsync();