Asp.Net 回调

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aspx:

<head runat="server">
    <title>Test</title>
    <script type ="text/javascript" >
     1.   function GetNumber() {
            UseCallback();

           //UseCallback("123","");带参数
        };
   4.     function GetRandonNumberFromServer(TextBox1, context) {
            document.forms[0].TextBox1.value = TextBox1
        };
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <input id="" type ="button" value ="Get Random Number" onclick ="GetNumber()" />
    <br />
    <br />
<asp:TextBox runat ="server" ID ="TextBox1" Text ="" ></asp:TextBox>
    </div>
    </form>
</body>
</html>

aspx.vb:

Partial Class _Default
    Inherits System.Web.UI.Page
    Implements System.Web.UI.ICallbackEventHandler
    Dim _callbackResult As String = Nothing
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim cbReference As String = Page.ClientScript.GetCallbackEventReference(Me, "arg", "GetRandonNumberFromServer", "context")
        Dim cbScript As String = "function UseCallback(arg,context)" & "{" & cbReference & ";" & "}"
        Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "UseCallback", cbScript, True)
    End Sub

3.    Public Function GetCallbackResult() As String Implements System.Web.UI.ICallbackEventHandler.GetCallbackResult
        Return _callbackResult
    End Function

2. Public Sub RaiseCallbackEvent(ByVal eventArgumentAs String) Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent
‘eventArgument 是前台传的参数值

_callbackResult = Rnd().ToString
End Sub

End Class