📄 asyncwsusingasyncpage.aspx

📁 《ASP.NET 2.0 XML 高级编程（第3版）》《ASP.NET 2.0 XML 高级编程（第3版）》

💻 ASPX

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<%@ Page Language="C#" Async="true" %>
<%@ Import Namespace="System.Data" %>
<script runat="server">
    CategoriesProxy.CategoriesService obj = new CategoriesProxy.CategoriesService();
    
    void Page_Load(object sender, EventArgs e)
    {
        BeginEventHandler begin = new BeginEventHandler(this.BeginGetAsyncData);
        EndEventHandler end = new EndEventHandler(this.EndGetAsyncData);
        AddOnPreRenderCompleteAsync(begin, end);
    }

    IAsyncResult BeginGetAsyncData(Object src, EventArgs args, AsyncCallback cb, Object state)
    {        
        return obj.BeginGetCategoriesAsDataSet(cb, state);
    }

    void EndGetAsyncData(IAsyncResult ar)
    {
        DataSet categoriesDataSet = obj.EndGetCategoriesAsDataSet(ar);
        output.DataSource = categoriesDataSet.Tables[0];
        output.DataBind();        
    }    

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Asynchronous Invocation of a Web Service using Asynchronous Pages</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>       
        <asp:GridView runat="server" ID="output" />
    </div>
    </form>
</body>
</html>

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