怎样保存用户控件（复合控件）中定义的属性

Question

我想在用户控件中写保存状态逻辑，而不是引用页中用视图状态和session之类的东西,以下代码count属性的值不能累加。     之所以这么做因为这更复合OO编程的标准。

用户控件代码==================================

Partial Class WebUserControl
    Inherits System.Web.UI.UserControl

    Private intCount As Integer

    Public Property count() As Integer
        Get
            Return intCount
        End Get
        Set(ByVal value As Integer)
            intCount = value
        End Set
    End Property

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        intCount += 1
    End Sub
End Class

 

引用页代码===================================================

Partial Class _Default
    Inherits System.Web.UI.Page

   Protected Sub Page_LoadComplete(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.LoadComplete
        Label1.Text = WebUserControl1.count
    End Sub
End Class

Answer 1

你好，你的问题不是因为没有赋值，而是永远都等于1。也就是 1 = 0 + 1；这主要是intCount每Click一次，与你上一次Click不是同一个，而是新的。如果想看到效果，可以 Private Static intCount As Integer（不知道有没有写对，VB语法不是很熟）

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邹俊才

Answer 2

那这样话，垃圾回收怎么办啊，那它不是永远都停留在内存里的，有没有可能，在用户控件中保存视图状态啊。就象自定义服务器控件时使用的方法 。

Answer 3

试了没用啊。

Answer 4

最后我用了个HiddenField控件来保存变量值，成功是成功了，但感觉特别扭。

Answer 5

终于搞定了。 在用户控件中用视图状态也是可以的，呵呵。

Partial Class WebUserControl
    Inherits System.Web.UI.UserControl

    Public Property count() As String
        Get
            Return CInt(ViewState("test"))
        End Get
        Set(ByVal value As String)
            ViewState("test") = value
        End Set
    End Property

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim a As String = CInt(ViewState("test"))
        a += 1
        ViewState("test") = a
    End Sub
End Class

Answer 6

 

问题彻底解决，我用重写了用户控件的 SaveControlState和LoadControlState，这种情况是是完美的，呵呵。

    Private intCount As Integer

    Public Property count() As Integer
        Get
            Return intCount
        End Get
        Set(ByVal value As Integer)
            intCount = value
        End Set
    End Property

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        intCount += 1
    End Sub

    Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
        Page.RegisterRequiresControlState(Me)
        MyBase.OnInit(e)
    End Sub

    Protected Overrides Function SaveControlState() As Object
        Return CType(intCount, Object)
    End Function

    Protected Overrides Sub LoadControlState(ByVal savedState As Object)
        intCount = CInt(savedState)
    End Sub