用PagePaser創建Page作為HttpHandler
在ASP.NET中，page其實就是一個HttpHandler，它處理請求，然后返回一大堆Html。那么是不是可以實例化一個Page類然后獲得其處理的結果呢？一個簡單的推理就能說明這是不行的。因為如果我們實例化Page，這樣new Page()，這是一個標準的.net代碼，編譯器無法知道相關的Page.aspx的內容。所以需要PagePaser幫忙，并且PagePaser也是ASP.NET內部編譯過程的關鍵步驟。下面看看使用方法：
protected void Page_Load(object sender, EventArgs e)
{
Response.Write(HttpUtility.HtmlEncode(DumpHtmlFrom("~/Default.aspx")));
}
//virtualPath: allow queries
string DumpHtmlFrom(string virtualPath)
{
StringWriter writer = new StringWriter();
var path = Request.Url.Scheme + "://" + Request.Url.Authority + VirtualPathUtility.ToAbsolute(virtualPath);
var parts = virtualPath.Split('?');
string query = string.Empty;
if (parts.Length > 1)
query = parts[1];
virtualPath = parts[0];
HttpContext context = new HttpContext(new HttpRequest(virtualPath, path, query), new HttpResponse(writer));
var handler = PageParser.GetCompiledPageInstance(virtualPath, MapPath(virtualPath), context);
handler.ProcessRequest(context);
return writer.ToString();
}
{
Response.Write(HttpUtility.HtmlEncode(DumpHtmlFrom("~/Default.aspx")));
}
//virtualPath: allow queries
string DumpHtmlFrom(string virtualPath)
{
StringWriter writer = new StringWriter();
var path = Request.Url.Scheme + "://" + Request.Url.Authority + VirtualPathUtility.ToAbsolute(virtualPath);
var parts = virtualPath.Split('?');
string query = string.Empty;
if (parts.Length > 1)
query = parts[1];
virtualPath = parts[0];
HttpContext context = new HttpContext(new HttpRequest(virtualPath, path, query), new HttpResponse(writer));
var handler = PageParser.GetCompiledPageInstance(virtualPath, MapPath(virtualPath), context);
handler.ProcessRequest(context);
return writer.ToString();
}
其中關鍵的步驟PageParser.GetCompiledPageInstance實例化了一個HttpHandler，并返回所有的Html。
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