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我正在写文件拉链。

我无法计算未来存档的正确文件大小，因此可以指定 Content-Length。

在两个 Thread.Sleep() 方法返回之前，此代码不会提示保存文件对话框。

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult Download()
    {
        return new DelayedUnsepcifiedLengthZipArchiveResult();
    }
}

public class DelayedUnsepcifiedLengthZipArchiveResult : ActionResult
{
    public override void ExecuteResult(ControllerContext context)
    {
        context.HttpContext.Response.ContentType = "application/zip";
        context.HttpContext.Response.CacheControl = "private";
        context.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
        context.HttpContext.Response.AddHeader("content-disposition", string.Format("attachment; filename=\"{0}\"", "test.zip"));
        context.HttpContext.Response.Flush();

        Thread.Sleep(10000);

        context.HttpContext.Response.Write("hello world");
        context.HttpContext.Response.Flush();

        Thread.Sleep(10000);

        context.HttpContext.Response.Write("hello world2");
        context.HttpContext.Response.Flush();

        context.HttpContext.Response.End();
    }
}

在 Chrome 和 IE 10 中，20 秒后我得到了保存对话框......

这是一种解决方法吗？

更新：

菲德勒发疯了。不确定，也许 Fidler 会自动添加 Conent-Length。这是我从提琴手那里得到的原始数据

在开始时

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Transfer-Encoding: chunked
Content-Type: application/zip
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNetMvc-Version: 4.0
content-disposition: attachment; filename="test.zip"
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?RDpcV29ya1xBY2FkZW15XEhpZ2hMb2FkQ2hhblxEb3dubG9hZGVyXGhvbWVcZG93bmxvYWQ=?=
X-Powered-By: ASP.NET
Date: Mon, 04 Mar 2013 13:39:24 GMT

下载完成后：

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/zip
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNetMvc-Version: 4.0
content-disposition: attachment; filename="test.zip"
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?RDpcV29ya1xBY2FkZW15XEhpZ2hMb2FkQ2hhblxEb3dubG9hZGVyXGhvbWVcZG93bmxvYWQ=?=
X-Powered-By: ASP.NET
Date: Mon, 04 Mar 2013 13:39:24 GMT
Content-Length: 23

hello worldhello world2

更新 2：

fiddler coused such veird behaviour, problem closed. Turn off your debug proxies bros...
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