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當您使用DataTable.Load
時,您如何知道是否所有結果數據都加載在DataTable
中?或者說,我們如何知道DataReader
是否已完成加載數據?如何知道「DataTable.Load()」是否已完成加載?
代碼:
'Connection, command etc.
Dim Reader as SqlDataReader = Command.ExecuteReader()
Dim SomeDataTable as new DataTable()
SomeDataTable.load(Reader); 'When will loading be finished or how would you know?
我使用VB.NET
更新:
這裏是我的原代碼:
Private Function LoadPRS(ByVal Username As String) As DataTable
Dim PRSList As New DataTable
Using Connection As New SqlConnection(ConfigurationManager.ConnectionStrings("DBCS").ToString)
Using Command As New SqlCommand _
("select * from products", Connection)
Connection.Open()
Using Reader = Command.ExecuteReader
PRSList.Load(Reader)
End Using
End Using
End Using
Return PRSList
End Function
真的嗎?所以我可以'使用Reader中的DataTable.Load(Reader)'作爲SqlDataReader = Command.ExecuteReader()... End using'沒有例外嗎? '因爲我會返回'DataTable'恐怕它不會完成,直到我回來... – dpp
@domanokz是的;這正是我的意思。大多數異步方法將是顯而易見的,即'BeginLoad','StartLoad'等,並且將(通常)返回'IAsyncResult'或'Task [任務]或採取某種完成回調。 –