尽管 this answer from Feb,但我无法将 View 呈现为字符串然后重定向(我认为在 1.0 版之后)声称这是可能的。我以为我做错了什么,然后我读到了这个answer from Haack in July声称这是不可能的。
如果有人让它工作并且可以帮助我让它工作,那就太好了(我会发布代码,错误)。但是,我现在需要解决方法。有几个,但都不理想。有没有人解决过这个问题,或者对我的想法有什么意见?
编辑 :我已经尝试过 Dan 的代码(与我已经尝试过的 Jan/Feb 的代码非常相似),但我仍然遇到相同的错误。我能看到的唯一实质性区别是他的例子使用了一个 View ,而我使用了一个局部 View 。稍后我将尝试使用 View 对此进行测试。
这是我所拥有的:
Controller
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;
}
自定义渲染器
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,
詹姆士
最佳答案
public Action SendEmail(int id)
{
//Let's say that id is the db id of an order that a customer has just placed.
//Go get that model from the db.
MyModel model = new Model(id);
//Now send that email. Don't forget the model and controller context.
SendEmail(model, this.ControllerContext);
//Render (or redirect!)
return RedirectToAction("Wherever");
}
private static void SendEmail(MyModel model, ControllerContext controllerContext)
{
//Recreate the viewdata
ViewDataDictionary viewData = controllerContext.Controller.ViewData;
viewData["Order"] = model;
string renderedView = "";
CustomRenderers customRenderers = new CustomRenderers();
//Now render the view to string
//ControllerContext, ViewPath, MasterPath, ViewDataDictionary, TempDataDictionary
//As you can see, we're not passing a master page, and the tempdata is in this instance.
renderedView = RenderViewToString(controllerContext, "~/Views/Orders/Email.aspx", "", viewData, null);
//Now send your email with the string as the body.
//Not writing that, as the purpose is just to show the rendering. :)
}
//Elsewhere...
public class CustomRenderers
{
public virtual string RenderViewToString(ControllerContext controllerContext, string viewPath, string masterPath, ViewDataDictionary viewData, TempDataDictionary tempData)
{
if (tempData == null)
{
tempData = new TempDataDictionary();
}
Stream filter = null;
ViewPage viewPage = new ViewPage();
//Right, create our view
viewPage.ViewContext = new ViewContext(controllerContext, new WebFormView(viewPath, masterPath), viewData, tempData);
//Get the response context, flush it and get the response filter.
var response = viewPage.ViewContext.HttpContext.Response;
response.Flush();
var oldFilter = response.Filter;
try
{
//Put a new filter into the response
filter = new MemoryStream();
response.Filter = filter;
//Now render the view into the memorystream and flush the response
viewPage.ViewContext.View.Render(viewPage.ViewContext, viewPage.ViewContext.HttpContext.Response.Output);
response.Flush();
//Now read the rendered view.
filter.Position = 0;
var reader = new StreamReader(filter, response.ContentEncoding);
return reader.ReadToEnd();
}
finally
{
//Clean up.
if (filter != null)
{
filter.Dispose();
}
//Now replace the response filter
response.Filter = oldFilter;
}
}
}
在您的 Orders/Email.aspx View 中,确保您引用 ViewData 中的所有内容,而不是模型。你可以这样做:
<% MyModel model = (MyModel)ViewData["Order"] %>
关于asp.net-mvc - 将 View 呈现为 MVC 中的字符串,然后重定向——解决方法?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1281430/