如何使用 Xamarin 更新 Parse.com 数据库中的对象？

Question

我有一个在线 Parse.com 数据库，我可以创建对象并查询它们，但不能更新。在 Parse.com 文档的 Xamarin 部分中，它只告诉您如何在创建对象后直接更新它，我不想这样做。我尝试调整文档对其他平台的说明，但没有奏效，我还尝试查询数据库并在此之后直接输入新字段值，但它将它们视为单独的函数。有人帮忙吗？

Parse.com 文档：

    // 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();

我最近尝试的：

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

Answer 1

在您的示例中，您将获得一个对象列表 (IEnumerable)，而不是单个对象。相反，尝试这样的事情：

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();