如何将ASP.NET MVC视图呈现为字符串? [英] How to render an ASP.NET MVC view as a string?

问题描述

我想输出两个不同的视图(一个作为将作为电子邮件发送的字符串)，另一个显示给用户的页面.

I want to output two different views (one as a string that will be sent as an email), and the other the page displayed to a user.

在ASP.NET MVC beta中有可能吗?

Is this possible in ASP.NET MVC beta?

我尝试了多个示例:

1..

如果使用此示例，则会收到"HTTP后无法重定向 标头已发送.".

If I use this example, I receive the "Cannot redirect after HTTP headers have been sent.".

2.. MVC框架:捕获视图的输出

如果使用此功能，我似乎无法执行redirectToAction，因为它 尝试渲染可能不存在的视图.如果我确实返回视图，它 完全搞砸了，看起来根本不对.

If I use this, I seem to be unable to do a redirectToAction, as it tries to render a view that may not exist. If I do return the view, it is completely messed up and doesn't look right at all.

有人对我遇到的这些问题有任何想法/解决方案，或者对更好的问题有任何建议吗?

Does anyone have any ideas/solutions to these issues i have, or have any suggestions for better ones?

非常感谢！

下面是一个示例.我想做的是创建 GetViewForEmail方法:

Below is an example. What I'm trying to do is create the GetViewForEmail method:

public ActionResult OrderResult(string ref)
{
    //Get the order
    Order order = OrderService.GetOrder(ref);

    //The email helper would do the meat and veg by getting the view as a string
    //Pass the control name (OrderResultEmail) and the model (order)
    string emailView = GetViewForEmail("OrderResultEmail", order);

    //Email the order out
    EmailHelper(order, emailView);
    return View("OrderResult", order);
}

已接受蒂姆·斯科特(Tim Scott)的回答(由我更改并格式化):

public virtual string RenderViewToString(
    ControllerContext controllerContext,
    string viewPath,
    string masterPath,
    ViewDataDictionary viewData,
    TempDataDictionary tempData)
{
    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;
    }
}

用法示例

假设来自控制器的呼叫获得了订单确认电子邮件，并传递了Site.Master位置.

Assuming a call from the controller to get the order confirmation email, passing the Site.Master location.

string myString = RenderViewToString(this.ControllerContext, "~/Views/Order/OrderResultEmail.aspx", "~/Views/Shared/Site.Master", this.ViewData, this.TempData);

推荐答案

这是我想到的，它对我有用.我在控制器基类中添加了以下方法. (您总是可以在其他地方使这些静态方法成为我想接受控制器作为参数的地方)

Here's what I came up with, and it's working for me. I added the following method(s) to my controller base class. (You can always make these static methods somewhere else that accept a controller as a parameter I suppose)

MVC2 .ascx样式

protected string RenderViewToString<T>(string viewPath, T model) {
  ViewData.Model = model;
  using (var writer = new StringWriter()) {
    var view = new WebFormView(ControllerContext, viewPath);
    var vdd = new ViewDataDictionary<T>(model);
    var viewCxt = new ViewContext(ControllerContext, view, vdd,
                                new TempDataDictionary(), writer);
    viewCxt.View.Render(viewCxt, writer);
    return writer.ToString();
  }
}

Razor .cshtml样式

public string RenderRazorViewToString(string viewName, object model)
{
  ViewData.Model = model;
  using (var sw = new StringWriter())
  {
    var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext,
                                                             viewName);
    var viewContext = new ViewContext(ControllerContext, viewResult.View,
                                 ViewData, TempData, sw);
    viewResult.View.Render(viewContext, sw);
    viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
    return sw.GetStringBuilder().ToString();
  }
}

添加了剃刀代码.

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