Question

在这个程序中我创建了一个数组，而点击get按钮则没有显示任何输出，因为str变量是空的。我该如何获得正确的输出...

Partial Class dynamic_array
    Inherits System.Web.UI.Page
    Dim s(2) As String

    Dim str As String


    Protected Sub btn_save_Click(sender As Object, e As System.EventArgs) Handles btn_save.Click

        Dim i As Integer = 0
        For i = 0 To s.Length - 1
            s(i) = InputBox("enter name " + (i + 1).ToString)
        Next



    End Sub

    Protected Sub btn_get_Click(sender As Object, e As System.EventArgs) Handles btn_get.Click
        Dim i As Integer = 0
        str = ""

        For i = 0 To s.Length - 1
            str &= s(i) + vbCrLf
        Next

        MsgBox(str)

    End Sub
End Class

Answer 1

在Asp.Net中，页面级别上设置的所有变量都会在每次回发时重置。这就是为什么在按钮点击时s变量总是空的。

您可以将此信息保存在viewstate

中

Viewstate("MyData") = "Something"

我鼓励您熟悉Asp.Net网络表单基本状态管理：http://msdn.microsoft.com/en-us/library/50x35554(v=vs.80).aspx

Answer 2

您可以使用会话或 ViewState 来存储数组值。

试试这个

Partial Class dynamic_array
Inherits System.Web.UI.Page
Dim s(2) As String

Dim str As String


Protected Sub btn_save_Click(sender As Object, e As System.EventArgs) Handles btn_save.Click

    Dim i As Integer = 0
    For i = 0 To s.Length - 1
        s(i) = InputBox("enter name " + (i + 1).ToString)
    Next



 ViewState("Array")=s

End Sub

Protected Sub btn_get_Click(sender As Object, e As System.EventArgs) Handles btn_get.Click
    Dim i As Integer = 0
    str = ""
s=  ViewState("Array")
    For i = 0 To s.Length - 1
        str &= s(i) + vbCrLf
    Next

    MsgBox(str)

End Sub
End Class

希望这会有所帮助，如果有帮助，马克会很有用。

如何在vb asp.net 2010中获取数组元素作为输出

2 个答案: