渲染视图为一个字符串MVC中，然后重定向 - 解决方法？ [英] Rendering a view to a string in MVC, then redirecting -- workarounds?
问题描述
我无法呈现视图为一个字符串，然后重定向，尽管这个答案从声称二月（1.0版本之后，我认为）这是可能的。我以为我做错了什么，然后我读这<一个href=\"http://stackoverflow.com/questions/1149068/render-view-to-string-followed-by-redirect-results-in-exception\">answer从哈克在声称这是不可能的七月。
I can't render a view to a string and then redirect, despite this answer from Feb (after version 1.0, I think) that claims it's possible. I thought I was doing something wrong, and then I read this answer from Haack in July that claims it's not possible.
如果有人有它的工作，可以帮助我得到它的工作，这是伟大的（并且我会后code，错误）。不过，我现在需要在变通的地步。有一些，但没有什么理想。有没有人解决了这个，或者对我的想法有何评论？
If somebody has it working and can help me get it working, that's great (and I'll post code, errors). However, I'm now at the point of needing workarounds. There are a few, but nothing ideal. Has anybody solved this, or have any comments on my ideas?
- 这是渲染电子邮件。虽然我可以肯定发送Web请求的电子邮件外（存储信息的数据库，后来得到它），有很多类型的电子邮件，我不希望存储模板数据（用户对象，一些其他的LINQ对象）在分贝让它以后呈现。我可以创建一个简单的，序列化的POCO并保存在数据库中，但是为什么呢？ ......我只是想呈现的文本！
- 我可以创建一个检查，如果头已发送（无法弄清楚如何做到这一点？ - try / catch语句）的新RedirectToAction对象，如果是这样，建立了一个简单的页面与元重定向， JavaScript重定向，也是一个点击这里链接。
- 在我的控制器，我还记得，如果我提供的电子邮件，如果是这样，做手工＃2通过显示的视图。
- 我可以手动任何潜在的邮件渲染之前发送重定向报头。然后，而不是使用MVC基础设施redirecttoaction，我只是叫result.end。这似乎是最简单的，但真的很乱。
- 还有别的吗？
修改：我试过丹的code（非常类似于从一月/二月的code，我已经尝试过），我仍然得到同样的错误。唯一的实质性的区别我可以看到的是，他的例子使用了一个观点，而我使用的局部视图。我会尝试测试稍后以期。
EDIT: I've tried Dan's code (very similar to the code from Jan/Feb that I've already tried) and I'm still getting the same error. The only substantial difference I can see is that his example uses a view while I use a partial view. I'll try testing this later with a view.
下面是我得到了什么：
控制器
public ActionResult Certifications(string email_intro)
{
//a lot of stuff
ViewData["users"] = users;
if (isPost())
{
//create the viewmodel
var view_model = new ViewModels.Emails.Certifications.Open(userContext)
{
emailIntro = email_intro
};
//i've tried stopping this after just one iteration, in case the problem is due to calling it multiple times
foreach (var user in users)
{
if (user.Email_Address.IsValidEmailAddress())
{
//add more stuff to the view model specific to this user
view_model.user = user;
view_model.certification302Summary.subProcessesOwner = new SubProcess_Certifications(RecordUpdating.Role.Owner, null, null, user.User_ID, repository);
//more here....
//if i comment out the next line, everything works ok
SendEmail(view_model, this.ControllerContext);
}
}
return RedirectToAction("Certifications");
}
return View();
}
SendEmail（）
public static void SendEmail(ViewModels.Emails.Certifications.Open model, ControllerContext context)
{
var vd = context.Controller.ViewData;
vd["model"] = model;
var renderer = new CustomRenderers();
//i fixed an error in your code here
var text = renderer.RenderViewToString3(context, "~/Views/Emails/Certifications/Open.ascx", "", vd, null);
var a = text;
}
CustomRenderers
public class CustomRenderers
{
public virtual string RenderViewToString3(ControllerContext controllerContext, string viewPath, string masterPath, ViewDataDictionary viewData, TempDataDictionary tempData)
{
//copy/paste of dan's code
}
}
错误
[HttpException (0x80004005): Cannot redirect after HTTP headers have been sent.]
System.Web.HttpResponse.Redirect(String url, Boolean endResponse) +8707691
谢谢，
詹姆斯
Thanks, James
推荐答案
更新。
现在，我明白，你要使用的视图引擎来生成HTML实际的电子邮件，我提出以下建议：
Now that I understand that you want to use the view engine to generate the actual email in html, I propose the following:
code渲染动作控制器中的文本：
的http://mikehadlow.blogspot.com/2008/06/mvc-framework-capturing-output-of-view_05.html
Code to render action to text within a controller: http://mikehadlow.blogspot.com/2008/06/mvc-framework-capturing-output-of-view_05.html
小编辑到code：
public ActionResult Certifications(string email_intro)
{
//a lot of stuff
ViewData["users"] = users;
if (isPost())
{
//create the viewmodel
var view_model = new ViewModels.Emails.Certifications.Open(userContext) { emailIntro = email_intro };
foreach (var user in users)
{
if (user.Email_Address.IsValidEmailAddress())
{
view_model.user = user;
view_model.certification302Summary.subProcessesOwner = new SubProcess_Certifications(RecordUpdating.Role.Owner, null, null, user.User_ID, repository);
SendEmail(view_model);
}
}
return RedirectToAction("Certifications");
}
return View();
}
public void SendEmail(ViewModels.Emails.Certifications.Open model)
{
var vd = context.Controller.ViewData;
vd["model"] = model;
var renderer = new CustomRenderers();
// Implement the actual email rendering as a regular action method on this controller
var text = this.CaptureActionHtml(c => (ViewResult)c.RenderEmail(model));
var a = text;
}
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