以字符串形式呈现视图
我想输出两个不同的视图(一个是以电子邮件形式发送的字符串),另一个则显示给用户。
这在ASP.NET MVC测试版中可能吗?
我已经尝试了多个例子:
1.在ASP.NET MVC Beta中将RenderPartial转换为字符串
如果我使用此示例,则会收到“HTTP头已发送后无法重定向”。
2. MVC框架:捕获视图的输出
如果我使用这个,我似乎无法做一个redirectToAction,因为它试图渲染一个可能不存在的视图。 如果我确实返回了这个视图,那它就完全搞砸了,看起来并不正确。
有没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?
非常感谢!
下面是一个例子。 我想要做的是创建GetViewForEmail方法 :
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);
}
Tim Scott接受的答案(由我更改和格式化):
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
假设来自控制器的电话获得订单确认电子邮件,传递Site.Master位置。
string myString = RenderViewToString(this.ControllerContext, "~/Views/Order/OrderResultEmail.aspx", "~/Views/Shared/Site.Master", this.ViewData, this.TempData);
这是我想出来的,它对我有用。 我将下列方法添加到我的控制器基类中。 (你总是可以将这些静态方法作为接受控制器的其他地方作为我想的参数)
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();
}
}
剃刀.cshtml风格
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();
}
}
编辑:添加剃刀代码。
这个答案不在我的路上。 这是最初从https://stackoverflow.com/a/2759898/2318354,但在这里我已经展示了与“静态”关键字使用它的方式,使其对所有控制器通用。
为此你必须在类文件中创建static
类。 (假设你的类文件名是Utils.cs)
这个例子是For Razor。
Utils.cs
public static class RazorViewToString
{
public static string RenderRazorViewToString(this Controller controller, string viewName, object model)
{
controller.ViewData.Model = model;
using (var sw = new StringWriter())
{
var viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, viewName);
var viewContext = new ViewContext(controller.ControllerContext, viewResult.View, controller.ViewData, controller.TempData, sw);
viewResult.View.Render(viewContext, sw);
viewResult.ViewEngine.ReleaseView(controller.ControllerContext, viewResult.View);
return sw.GetStringBuilder().ToString();
}
}
}
现在,您可以通过在控制器文件中添加NameSpace,将“this”作为参数传递给Controller,从而从控制器调用此类。
string result = RazorViewToString.RenderRazorViewToString(this ,"ViewName", model);
我希望这会对你使代码干净整洁有用。
这适用于我:
public virtual string RenderView(ViewContext viewContext)
{
var response = viewContext.HttpContext.Response;
response.Flush();
var oldFilter = response.Filter;
Stream filter = null;
try
{
filter = new MemoryStream();
response.Filter = filter;
viewContext.View.Render(viewContext, viewContext.HttpContext.Response.Output);
response.Flush();
filter.Position = 0;
var reader = new StreamReader(filter, response.ContentEncoding);
return reader.ReadToEnd();
}
finally
{
if (filter != null)
{
filter.Dispose();
}
response.Filter = oldFilter;
}
}
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