Question

ASP.NET Webforms目标.NET 4。我需要在页面上显示一个pdf文档（在iframe中），加载pdf会花费很多时间，所以想法是加载pdf文档异步并在iff中显示等待消息，一旦pdf准备就绪，在iframe中显示pdf。

// PrintPDFView.aspx
<div id="pdfDiv" style="height: 100%;">
    // show pdf if ready otherwise waiting message
    <iframe runat="server" width="100%" height="100%" id="PDFViewDoc" />
</div>

// PrintPDFView.aspx.cs
protected override void OnPreRender(EventArgs e)
{
                //...
                // Long running process
                CallDocumentsService();
                //...
                PDFViewDoc.Attributes["src"] = "ShowPDFView.aspx";
}

// ShowPDFView.aspx
// When the pdf is ready, it will be rendered on this page
<body>
    <div id="LoadingPdf">
        <h1>Loading your document!</h1>    
        <p>This may take a few minutes...</p>
    </div>
</body>

// ShowPDFView.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
    // ...
    Response.BinaryWrite(pdfToDisplay);
    //...
}

ASP.NET WebForms中的异步操作

0 个答案: