ASP.NET:将 ViewState 移动到页面底部 [英] ASP.NET: Moving ViewState to bottom of page

问题描述

将 ViewState 移动到页面底部

What are the latest and greatest ways to move ViewState to bottom of the page

这可以在 IHttpHandler 中完成吗?它可以在 web.config 中指定以拦截对*.aspx"的请求?

Can this be done in a IHttpHandler that can be specified in the web.config to intercept requests to "*.aspx"?

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

其他选项是，这可以在 IHttpModule 中完成，但性能不佳，因为它会拦截所有请求.

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

也可以在派生自 Page 或 MasterPage 类的类中完成，但这不是模块化.

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

是否有任何绩效惩罚?

推荐答案

在进行一些研究后，我整理了这篇博文.

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

我通过创建一个 HttpModule 并应用一个 响应过滤器 来解决这个问题，它修改页面的输出并将 ViewState 移动到表格底部.

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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