asp.net 2.0中异步调用webservices

今天读台湾董老师的AJAX书，发现其实也可以不建立asmx这样来调用了

比如

'建立Page Method

<System.Web.Services.WebMethod()> _

<System.Web.Script.Services.ScriptMethod()> _

Public Shared Function GetServerTime(ByVal format As String) As String

'调用服务器端时间

Return Now.ToString(format)

End Function

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

'建立调用后端Web Services的JavaScript

Dim js As String

js = ""

js += "function CallWebServices(){"

js += " PageMethods.GetServerTime('yyyy/MM/dd HH:mm:ss',onOK);"

js += "}"

js += "function onOK(returnData){"

js += " $get('TextBox1').value=returnData;"

js += "}"

js = "<script>" & js & "</script>"

Me.ClientScript.RegisterStartupScript(GetType(String), "", js)

'将调用后端Web Services的JavaScript附加到Button1的onclick事件上

Me.Button1.Attributes("onclick") = "CallWebServices();"

'设置 EnablePageMethods

Me.ScriptManager1.EnablePageMethods = True

End Sub

End Class

前台页面

<form id="form1" runat="server">

<div>

<div>

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<input id="Button1" runat="server" type="button" value="button" /></div>



</div>

</form>