如何使用VB.net查询parse.com？

Question

我在用VB.Net构建查询时遇到了麻烦。 “ Item”是我的解析类“ PLUNmbr”是该类中的字符串列

Private Async Sub btnSyncToCloud_Click(sender As Object, e As EventArgs) Handles btnSyncToCloud.Click

Dim qItem As New ParseQuery(Of ParseObject)("Item")
qItem.WhereEqualTo("PLUNmbr", "0002")
Dim obj As Parse.ParseObject = Await qItem.FirstAsync

Debug.Print("PLUNmbr = " & obj("PLUNmbr").Value.ToString.Trim)
//This always prints out "0001" - which happens to be the first record in the class.
//No matter how I set the criteria - 0001 comes back.

end sub

Answer 1

该行：

qItem.WhereEqualTo("PLUNmbr", "0002")

不会修改 qItem ，它只是返回添加了过滤器的新实例。 您需要将代码更改为：

qItem = qItem.WhereEqualTo("PLUNmbr", "0002")

我想您也可以这样做：

Dim qItem As New ParseQuery(Of ParseObject)("Item")
Dim obj As Parse.ParseObject = Await qItem.WhereEqualTo("PLUNmbr", "0002").FirstAsync