ASP.NET:将ViewState移至页面底部 [英] ASP.NET: Moving ViewState to bottom of page

问题描述

将ViewState移至页面底部的最新和最大方法是什么

可以在 web.config 中指定的 IHttpHandler 中完成此操作，以拦截对"* .aspx"的请求吗?

 < httpHandlers><添加动词="*" path ="*.aspx" type ="MyApp.OptimizedPageHandler"/>< httpHandlers> 

其他选择是可以在 IHttpModule 中完成此操作，但这不是性能优异，因为它将拦截所有请求.

也可以在源自 Page 或 MasterPage 类的类中完成，但这不是模块化.

对此有任何性能惩罚吗?

解决方案

进行了一些研究之后，我整理了

<httpHandlers>
    <add verb="*" path="*.aspx" type="MyApp.OptimizedPageHandler" />
<httpHandlers>

Other options is that this could be done in a IHttpModule, but that is not as performant, as it will intercept all requests.

Also it could be done in an a class deriving from the Page or MasterPage-class, but this is not as modular.

Are there any performance penalties to this?

解决方案

After conducting some research I put together this blog-post.

I solved the issue by creating a HttpModule and applying a Response Filter, which modifies the output of the page and moves the ViewState to the bottom of the form.

public class ViewStateSeoHttpModule : IHttpModule {
    public void Init(HttpApplication context) {
        context.BeginRequest += new EventHandler(BeginRequest);
    }

    private void BeginRequest(object sender, EventArgs e) {
        HttpApplication application = sender as HttpApplication;

        bool isAspNetPageRequest = GetIsAspNetPageRequest(application);
        if(isAspNetPageRequest) {
            application.Context.Response.Filter =
                new ViewStateSeoFilter(application.Context.Response.Filter);
        }
    }

    private bool GetIsAspNetPageRequest(HttpApplication application) {
        bool isAspNetPageRequest = application.Context.Handler is System.Web.UI.Page;
        return isAspNetPageRequest;
    }
    // [...]

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